Horticulture Principles and Practices

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Chlorosis (the yellowing of green leaves) is associated with deficiencies in nitrogen, sulfur, magnesium, iron, and other elements. The differences among the elements lie in the pattern of chlorosis (interveinal, veinal, or uniform), the part of the leaf (marginal or whole leaf ), the age of the leaf (young or old), and whether it is the dominant symptom. Plants often become stunted in growth under conditions of poor nutrition. Deficiency symptoms are easier to spot in certain species than in others. In short, it takes experience to be able to utilize the visual diagnosis precisely. Further, deficiency associated with micronutrients is more common in greenhouse production. Other weaknesses of visual diagnosis are that pH cannot be observed, and more importantly the level of soluble salts and general nutritional status cannot be ascertained for appropriate amendments. Soil Test A soil test is a more effective and useful diagnostic evaluation than visual diagnosis for soil nutritional status. A soil test (depending on what is actually done) (1) provides a measure of soil pH (deficiency may be due to improper pH affecting the availability of the nutrient element) and (2) measures the total amount of a nutrient present in the soil; it also provides information on the proportion of the nutrient that is readily available. A soil test can be conducted before planting, during soil preparation, or during production as the need arises. Soil testing is recommended as a routine part of a production operation. When done before planting, it allows the grower to adopt a preventive strategy rather than a curative one to nutritional problems in production. If soil pH is the problem, liming is easier and more effectively applied before planting so that it can be thoroughly mixed with the soil. A soil test helps in planning so that the needed types and amounts of fertilizers are purchased. It also helps in determining what crop production operation the soil will support naturally or what it will take to amend it for another production operation. In a greenhouse operation, a fertilizer regime should be developed for the medium, type of plant, and specific production operation. Greenhouse media components react differently with plant nutrients. For example, pine bark– and peat moss–based soilless media (plant growth media containing no natural soil) tend to experience micronutrient deficiency, especially involving iron. It is critical for a greenhouse operation to periodically monitor the pH and soluble-salt content of growing media to prevent injury to plants. Excessive salts can build up in the root medium from the application of soluble fertilizers. This high salt concentration prevents water from entering plant roots because of a drastically reduced osmotic potential. Normally, root cells have higher salt concentration than the soil solution; thus osmosis can occur and roots are able to absorb water. A signal that a soil is high in soluble salt is indicated when plants appear to be wilting on a bright day in spite of adequate moisture in the soil. Seedlings are more prone to injury from high soluble-salt levels than established plants. Salt tolerance of selected plants is presented in Table 4–10. One can conduct a soil test by purchasing a home soil test kit. However, for more detailed analysis, the soil sample may be sent to a commercial or university laboratory designated by the state or county, either for a fee or free of charge, depending on the particular policies of the state department of agriculture and the testing center. A good soil test starts with good soil sampling; the results of a test are only as good as the samples used. Samples must be representative of the field. For a small garden, about 10 to 12 samples taken to include 8 to 12 inches (20.3 to 30.5 centimeters) of the soil profile (ensuring that both the topsoil and the soil in the root zone are included), and spread over the piece of land, should be adequate. These subsamples are mixed together in a container, and from this mixture, a small sample is taken and sent to the laboratory for analysis. A representative sample can be taken just by observing certain general guidelines. First, look at the general area to be sampled, and, if necessary, divide it into sections based on their level of uniformity. Sample these different sections separately. Avoid sampling distinctly unusual sites (e.g., waterlogged land). 4.4 Fertilizers 121
TABLE 4–10 Plant Bermuda grass Beet Broccoli Tomato Cucumber Muskmelon Rose Plant Soil Salt Tolerance of Selected Plants Relatively Salt Tolerant Scientific Name Cynodon dactylon Beta vulgaris Brassica oleraceae Lycopersicon esculentum Cucumis sativus Cucumis melo Rosa odorata Relatively Salt Intolerant Scientific Name Bentgrass, colonial Kentucky bluegrass Strawberry Avocado Grape Carrot Onion Gardenia Geranium Azalea Sweet corn Pepper Agrostis tenuis Poa pratensis Fragaria spp. Persea americana Vitis spp. Daucus carota Allium cepa Gardenia jasminoides Pelargonium x hortorum Rhododendron spp. Zea mays var. saccharata Capsicum annuum Foliar Analysis 122 Chapter 4 Plant Growth Environment Foliar analysis is like a soil test performed on leaves. One difference between the two tests is that while a soil test provides information on nutrients available for uptake, foliar analysis provides information on nutrients taken up and accumulated in the leaf. A foliar test does not provide information on the growing medium pH or soluble-salt content, but it offers a complete analysis of all essential nutrients. The rationale of foliar analysis is that the nutrient content of the plant’s tissue affects its growth. Up to a point, increasing the content of essential nutrients will result in increased growth. However, plants are able to take in large amounts of nutrients without corresponding changes in growth, a situation called luxury consumption. Excessive amounts of nutrients (beyond luxury consumption) can be injurious to the plant. To conduct foliar analysis, representative samples of leaves are obtained from the plant. Species differ in which leaves are most representative of the whole plant. The age of the leaves also affects the nutrient content. Samples of foliar analysis should be obtained at intervals of four to six weeks. The results of analysis are compared with standards developed from testing a wide variety of sources. The standards for macronutrients are crop specific and vary widely; micronutrient standards are widely applicable. 4.4.4 APPLYING FERTILIZERS The first step in a fertilizer program is to determine the type and amount of fertilizer needed. Excessive fertilization is economically wasteful and may even injure or kill the plants. A fertilizer program should take into account the cropping history of the field, the soil type, and the needs of the crop being grown. Since vegetables generally are heavy users of soil nutrients, fields that have been cropped with vegetables on a repeated basis may require fertilization.
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HORTICULTURE Principles and Practic
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HORTICULTURE Principles and Practic
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With love to Theresa, quarterback;
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Brief Contents Preface xxi PART 1 T
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Contents Preface xxi PART 1 THE UND
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5.3 PLANT GROWTH PROCESSES 160 5.4
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8.20 COMMON GREENHOUSE DISEASES 276
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12.3 INTERNAL ENVIRONMENTAL CONTROL
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PART 6 Summary 541 References and S
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22.18 INDOOR COMPOSTING SYSTEMS 668
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Preface Horticulture is the area of
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ACKNOWLEDGMENTS I am very grateful
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PART 1 THE UNDERLYING SCIENCE CHAPT
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1 What Is Horticulture? PURPOSE AND
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(a) (c) (b) (d) FIGURE 1-1 The many
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FIGURE 1 Bridge. The plaza view of
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CYCADS Many people mistake these pr
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FIGURE 2 The world's largest unbran
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FIGURE 2 Sold flowers are loaded on
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FIGURE 1-4 Formal landscaping featu
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1.4 ROLEOFTHENURSERY AND SEED INDUS
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1.5 HORTICULTURE AND SOCIETY Hortic
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TABLE 1-3 U.S. Horticultural Export
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Turfgrass Operation 1. Landscape te
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What Is Horticulture? This site pro
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Examples of botanical gardens http:
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2 Classifying and Naming Horticultu
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Eight major taxa are commonly used
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TABLE 2-3 The Divisions of the King
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HISTORY OF PLANT TAXONOMY PAUL R. F
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AGE OF HERBALISTS Two major events
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possible system of nomenclature. Ho
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TABLE 1 Type Categories for Plant N
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2.3 OTHER CLASSIFICATION SYSTEMS (O
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2. Shrubs. A shrub has no main trun
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Simple Fruits Fleshy Fruits Drupe B
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FIGURE 2-14 A pome, represented by
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2.3.5 CLASSIFICATION OF VEGETABLES
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(a) (b) FIGURE 2-22 (Source: George
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FIGURE 2-25 A narrowleaf plant. (So
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FIGURE 2-29 Parts of a typical gras
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such as rosemary, sage, thyme, marj
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c. Leaves d. Bulbs 2. Cut across (t
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Whole plant Organs FIGURE 3-1 Level
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ibonucleic acid (RNA), proteins, an
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called cristae; this extreme foldin
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By virtue of its position, the prim
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Page 102 and 103: Upper epidermis Palisade layer FIGU
Page 104 and 105: usually occur in xerophytes. In cer
Page 106 and 107: FIGURE 3-22 Selected common leaf ma
Page 108 and 109: FIGURE 3-25 Selected common leaf ti
Page 110 and 111: absorption of water and minerals fr
Page 112 and 113: Outer bark Inner bark FIGURE 3-37 T
Page 114 and 115: Anther Filament Stamen FIGURE 3-41
Page 116 and 117: Exocarp Parts of a typi- FIGURE 3-4
Page 118 and 119: PRACTICAL EXPERIENCE LABORATORY 1.
Page 120 and 121: 4.1 CLIMATE, WEATHER, AND HORTICULT
Page 122 and 123: concentration in the atmosphere.A c
Page 124 and 125: TABLE 4-1 Climatic Adaptation of Se
Page 126 and 127: and upward. Another important gener
Page 128 and 129: Rate of photosynthesis mg/sq. dm/hr
Page 130 and 131: and plants that flower under only c
Page 132 and 133: times of the year. Growers start th
Page 134 and 135: content. This section is sometimes
Page 136 and 137: TABLE 4-7 Soil Mineral Nutrients Es
Page 138 and 139: Micronutrients (Trace Elements) Mic
Page 140 and 141: Neutral FIGURE 4-11 A representatio
Page 142 and 143: 4.4 FERTILIZERS Fertilizer sources
Page 144 and 145: One of the most commonly used contr
Page 148 and 149: Fertilizers may be applied before p
Page 150 and 151: It is neither practical nor safe to
Page 152 and 153: Solution: How much of ammonium nitr
Page 154 and 155: 1°C (34°F), the optimum temperatu
Page 156 and 157: Cellulose sponge Perched water tabl
Page 158 and 159: Overhead Sprinkler Irrigation Water
Page 160 and 161: FIGURE 4-19 Furrow irrigation of le
Page 162 and 163: can self-install an underground irr
Page 164 and 165: 1. Surface drainage. Surface draina
Page 166 and 167: Secondary Tillage Primary tillage i
Page 168 and 169: (a) (b) (c) (d) FIGURE 4-20 (Source
Page 170 and 171: texture. The most commonly used gra
Page 172 and 173: TABLE 4-11 Selected Standard Mixes
Page 174 and 175: Steam Pasteurization Steam pasteuri
Page 176 and 177: Maracher, H. 1986. Mineral nutritio
Page 178 and 179: 5 Plant Physiology PURPOSE AND EXPE
Page 180 and 181: Growth in an organism follows a cer
Page 182 and 183: 5.1.2 THE ROLE OF SIGNALS IN GROWTH
Page 184 and 185: waxes are embedded. Waxes consist o
Page 186 and 187: 5.3.1 PHOTOSYNTHESIS Photosynthesis
Page 188 and 189: CO 2 FIGURE 5-6 The C 4 pathway of
Page 190 and 191: Growth and Development The general
Page 192 and 193: TABLE 5-2 Energy Produced from Aero
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conditions exist to sustain growth
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Shoot Elongation In certain plants,
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for success, since high temperature
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FIGURE 5-13 Ripening of plantain sh
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Terminal bud removed Unbranched pla
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conditions—pertaining to light, m
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them to maturity. The major process
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6 Breeding Horticultural Plants PUR
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Similarly, there can be no plant br
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APPLICATION, CHALLENGES, AND PROSPE
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hit with target DNA. Therefore, it
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Generally, within ten days of exper
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Aziz A.N., Sauve R.J., Zhou S., 200
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(b) F 1 Rr Rr round round F 2 RR R
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e.g., Aa × Aa), the lethal allele
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eeder’s equation. Simply stated,
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Before the seed or product becomes
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6.18.2 THE GENERAL STEPS OF RDNA TE
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2. Political disagreement. There ar
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REFERENCES AND SUGGESTED READING Ac
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PART 2 PROTECTING HORTICULTURAL PLA
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7 Biological Enemies of Horticultur
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8. Weeds may clog drains, waterways
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is also a root parasite that obtain
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LEGISLATIVE Both state and federal
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Example Integrated cultural, physic
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7.4.2 IMPORTANT INSECT ORDERS Insec
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Egg FIGURE 7-3 Life cycle of an ins
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sucking insects (also found with so
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FIGURE 7-12 Corn earworm damage. (S
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TABLE 7-1 Selected Fungal Diseases
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7.6.1 SMALL ANIMALS Rabbits, mice,
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FIGURE 7-16 The disease triangle. P
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fungitoxic exudates in its leaves,
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SUMMARY Insects are a major class o
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For the home growers or those who c
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for consumers and the environment).
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TABLE 8-1 Strategy 4: Strategies an
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gibberellic acid spray overcomes st
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In a competitive industry, a variet
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Chemicals gain access to humans thr
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2. Pesticide management. Controllin
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Every organism has its natural enem
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TABLE 8-3 Selected Examples of Biol
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1 2 YEAR 3 4 FIGURE 8-5 cycle. A cr
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6. Heat treatment. In the greenhous
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Organic Compounds (Organics) Organi
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under enclosed conditions (e.g., wa
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FIGURE 8-9 A tractor-mounted spraye
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8.11.9 LANDSCAPE PESTS AND THEIR CO
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application, a particular herbicide
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Further, they do not provide unifor
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SUMMARY Herbicides are chemicals us
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Sulfur may be applied for both prev
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8.23 PREVENTING GREENHOUSE DISEASES
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PART 3 PROPAGATING HORTICULTURAL PL
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9 Sexual Propagation PURPOSE AND EX
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Anther Microspore Megaspore mother
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Lettuce seeds Red light Darkness Fa
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FEDERAL AND STATE SEED LAWS Federal
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Germination Test In laboratory prac
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FIGURE 15 The essential structures
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processing into flour or meal). How
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physiologically immature seeds must
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seeds may be treated in this way be
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The two basic modes of seedling eme
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locations in the field. Home garden
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FIGURE 9-9 A plastic flat. (Source:
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(a) (b) FIGURE 9-12 (a) Sowing seed
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y the gardener or grower. Whatever
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REFERENCES AND SUGGESTED READING Co
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species enables vegetative propagat
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for rapid rooting. There are two ba
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Cutting involving one node (e.g., s
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This practice is especially importa
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10.6.4 STICKING THE CUTTING Cutting
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(a) Indexing by budding Diseased pl
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10.11 M ETHODS OF GRAFTING Grafting
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Scion Wax FIGURE 10-17 Steps in bar
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MODULE 3 BUDDING 10.12 TYPES OF BUD
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MODULE 4 LAYERING 10.13 TYPES OF LA
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Buried part of shoot is nicked FIGU
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variety of ways. In air layering, a
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FIGURE 10-34 by using cormels. Prop
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Psuedobulbs In the Dendrobium orchi
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The technique is used widely in cro
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PART 4 GROWING PLANTS INDOORS CHAPT
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11 Growing Houseplants PURPOSE AND
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TABLE 11-1 Common houseplants Commo
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Saddle leaf Philodendron selloum To
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Window Displays Plants in windows e
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CONTAINER GARDENS DR. TERRI W. STAR
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annuals and hardy perennial species
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of the large container filled with
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perfection about four to six weeks
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FIGURE 11-6 Flowers displayed on th
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TABLE 11-5 Plant Selected Plants fo
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The lighting condition near these w
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Fluorescent Lights Fluorescent ligh
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may be used for one pot or a group
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garden rooms, atriums, or a large c
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The photoperiod affects when the ho
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patted firm to keep the plant erect
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Other Materials Apart from clay and
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(a) ( FIGURE 11-25 Support for plan
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TABLE 11-7 Common Problems of House
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• Keep soil moist all the time
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• Prefers high temperatures • P
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amount and quality of light. If sup
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12 Controlled-Environment Horticult
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6. Curvilinear 7. Curved eave 8. Do
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Detached greenhouses have several a
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12.2.3 FRAME DESIGN There are two b
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horticultural business a less-expen
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Texas, Hawaii, and California. The
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source of heat for times when the t
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FIGURE 12-17 Greenhouse production
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FIGURE 12-21 Moving tables allowing
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Research program on greenhouse engi
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greenhouses equipped with a variety
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FIGURE 1 Annual energy required per
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This system was demonstrated in a 5
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FIGURE 6 Amounts of waste energy ut
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Ekholt, B.A., D.R. Mears, M.S. Gini
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or object to be warmed. Failure to
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objects in its path (e.g., the floo
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FIGURE 12-27 Motorized ventilation
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FIGURE 12-30 Movable internal shade
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FIGURE 12-33 A high pressure sodium
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Source of Water The quality of loca
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FIGURE 12-37 Overhead sprinkler irr
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Intermittent Feed Greenhouse plants
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However, in winter, greenhouse vent
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OUTCOMES ASSESSMENT 1. Explain the
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. Foliage or green plants. Foliage
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2. Labor. The size of the labor for
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FIGURE 13-1 Greenhouse production o
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FIGURE 13-2 Lettuce plug is inserte
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13.8.4 AGGREGATE HYDROPONIC SYSTEMS
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(a) (b) (c) FIGURE 13-6 Plug produc
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14 Growing Succulents PURPOSE AND E
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FIGURE 14-3 Leaf succulent represen
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frost-hardy. Their rosettes are usu
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TABLE 14-1 Plant Selected Popular S
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(a) (b) FIGURE 14-12 Typical bromel
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14.7.1 WHAT ARE CACTI? 14.7 CACTI C
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FIGURE 14-16 Opuntia. (Source: Crai
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FIGURE 14-23 Mammillaria. (Source:
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FIGURE 14-28 Both desert and jungle
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Growing mix Gravel Cacti (a) (b) FI
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PART5 GROWING PLANTS OUTDOORS: ORNA
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15 Principles of Landscaping PURPOS
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8. Create recreational grounds. Suc
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knowledge, with concern for resourc
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(a) (b) (c) FIGURE 15-2 The occurre
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GUIDELINES FOR LANDSCAPE DESIGN DAV
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the landscape. Some very successful
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Rhythm and Line Panoramic view of a
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FIGURE 15-10 A formal garden. The e
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How frequently do they entertain? A
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the patio should be located on the
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15.7.1 SELECTING PLANTS A homeowner
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Plant Arrangement in the Landscape
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Shadow FIGURE 15-15 Planting a tree
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SUMMARY Landscaping enhances the su
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3. Supply materials on a timely bas
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such as preparation rooms (for mixi
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of environmental fluctuations. Furt
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FIGURE 16-4 A bare-root tree seedli
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17 Installation of the Landscape PU
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for walks, driveways, and patios (F
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Planting may be limited to accentin
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17.3.3 PREPARING THE BED The soil s
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FIGURE 17-4 Bedding plants raised i
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SUMMARY Bedding plants are largely
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TABLE 17-6 Selected Ground Covers T
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TABLE 17-7 Selected Ornamental Gras
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they determine the success and surv
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12. Wildlife attraction. Trees in t
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pennsylvanica), hackberry (Celtis s
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y winds. A stake, which is often a
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TABLE 17-8 Selected Narrowleaf Ever
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TABLE 17-11 Selected Deciduous Shru
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Blooming bushes 1. Blue mist shrub
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Planting Bulblets and Bulbils Speci
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may be divided such that each secti
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FIGURE 18-1 (Source: George Acquaah
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Cool-Season (Temperate) Grasses In
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Growth Habit Turfgrasses are the mo
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Heavy Use Lawns on playgrounds and
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The seed should be free from weeds
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Source of Sod As with seed, sod sup
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A plug of sod FIGURE 18-7 Plugging
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way, plants are able to adapt to th
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form of a can placed on the lawn wi
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TABLE 18-3 Some Common Lawn and Tur
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even surface soil surface for layin
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MacCaskey, M. 1987. All about lawns
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Pruning is sometimes done in conjun
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4. Pruning may be done to reduce th
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19.4.2 SAWS A saw may be designed t
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defeat the purpose of pruning. The
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Bud withers as cut end dries back d
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19.6 STRATEGIES FOR PRUNING ABOVEGR
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Rejuvenation Pruning Cut canes to a
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3. In the third and subsequent year
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(a) Cut Prune (b) FIGURE 19-16 Step
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Eucalyptus and Paulownia are amenab
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TRAINING & PRUNING DECIDUOUS FRUIT
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Summer pruning eliminates an energy
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a) b) FIGURE 2 Newly planted apple
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FIGURE 6 Wooden limb spreaders can
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FIGURE 9. An apple tree trained to
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years to promote continued lateral
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Horizontal Espalier The horizontal
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19.16.1 CANE FRUITS Cane fruits are
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FIGURE 19-26 Shearing of Christmas
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pyramid-like form that is wider at
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After selecting the appropriate spe
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PART 6 GROWING PLANTS OUTDOORS: VEG
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20 Growing Vegetables Outdoors PURP
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The National Agricultural Statistic
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(This item omitted from WebBook edi
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growers should take to determine an
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pests and reduce/ eliminate hail da
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square yard (10 to 68 grams per squ
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High tunnels help increase the prof
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(This item omitted from WebBook edi
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20.4 VEGETABLE MARKET TYPES Fresh V
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Establishing the Crop Planting into
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home water supply from the tap. Thi
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Cole crop Cabbage Root Potato Bean
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6. Adequate nutrition. While overfe
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variable, ranging from creamy yello
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There are two general production pr
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This toxin is heat resistant and no
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large, or jumbo. The bulb may be sw
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REFERENCES Growing selected vegetab
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TABLE 21-1 Popular Herbs and Their
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(a) (b) (c) (d) (e) (f) FIGURE 21-1
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22 Organic Farming PURPOSE AND EXPE
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22.3 PRINCIPLES OF ORGANIC FARMING
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and the specific materials to be us
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22.8 MANAGING SOIL PHYSICAL QUALITY
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preemergent or early postemergent o
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Composting is a deliberate activity
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22.14.5 THE CARBON-TO-NITROGEN RATI
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Moisture Supply Water is required b
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Compost materials FIGURE 22-4 a wir
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As microbial decomposition proceeds
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Establishment and Management of an
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night, freezing can occur in spring
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accomplished by stratification. It
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transmitted by the dagger nematode
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PART 7 SPECIAL TECHNIQUES AND HANDL
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24 Cut Flowers and Floral Design PU
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to more than four-fold in standard
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Temperature and Humidity Wilting re
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FLORAL DESIGN: AN OVERVIEW BY WM. J
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Principle Definition Types (or Uses
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pH value-a measure of the acidity o
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FIGURE 6 Parallel Design-Parallel d
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24.3.2 TOOLS AND MATERIALS The tool
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3. Establish the focal point. 4. Ad
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Natural Drying To dry naturally, fl
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24.4.3 DRIED FLOWER ARRANGEMENTS Dr
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25 Terrarium Culture PURPOSE AND EX
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FIGURE 25-3 Terrarium containers ar
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FIGURE 25-5 Assortment of tools use
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25.6.7 ENHANCING THE DISPLAY Certai
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(a) (b) FIGURE 26-1 Bonsai can be c
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TABLE 26-3 Plant A Selection of Pop
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26.3.1 COLLECTING BONSAI PLANTS FRO
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Strip bark Bare branch FIGURE 26-9
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26.5.2 SANITATION It is critical to
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27 Postharvest Handling and Marketi
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whereas oranges are picked (they ha
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(b) (a) (c) (d) (e1) (e2) (f) FIGUR
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To reduce packaging injury, contain
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is replaced by the by-product of re
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Stored produce may lose some color,
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with pricing. When selling by volum
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(a) (b) FIGURE 27-5 Horticultural p
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APPENDIX A Temperature: Converting
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APPENDIX B Metric Conversion Chart
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APPENDIX D Common and Scientific Na
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Pecan (Carya illinoensis) Peony (Pa
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GLOSSARY A Abaxial Turned away from
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Cellulose A complex carbohydrate th
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Floriculture The science and practi
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M Macronutrient An essential elemen
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Root cap A mass of hard cells cover
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INDEX A-frame, 395 A-horizon, 108 A
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defined, 390 fertilization, 432-434
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Radiant heaters, 378 Radicle, 90 Re
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color plate 1 (a) (b) (c) (d) (e) M
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color plate 3 (b) (a) (c) (d) (e) (
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color plate 5 (a) (b) (d) (c) (e) (
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color plate 7 (b) (c) (d) (a) (e) (
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color plate 9 (a) (b) (c) (d) (e) (
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color plate 11 (a) (c) (b) (d) Grow
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color plate 13 (a) (b) (c) (d) (e)
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color plate 21 (a) (b) (c) (e) (d)
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color plate 23 (c) (b) (a) (d) (e)
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color plate 25 (c) (a) (b) (d) (e)
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color plate 27 (a1) (a2) (b2) (b1)
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color plate 31 (a) (b) (c) Floral d
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Horticulture Principles and Practices

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