Horticulture Principles and Practices

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FIGURE 6 Amounts of waste energy utilized in various size greenhouses. (Source: A.J. Both and D.R. Mears) technical feasibility and identify key design relationships, (Ekholt et al, 1983 and Both et al, 2007). Using performance data from a small cogeneration unit designed to operate on landfill gas the first study was done to compare the relative effectiveness of floors with and without the flooded storage. It was found that the larger storage capacity provided more management options for both the sizing of the cogeneration unit relative to the electrical load of the greenhouse and the periods of operation of the unit to realize optimum economics. The later study investigated alternative warm water storage systems and capacities for more flexibility in matching specific greenhouse operations. Additional concepts modeled include the use of an industrial scale fuel cell designed to operate on natural gas. With sufficient storage it was found that matching such a unit to an appropriately sized greenhouse will enable a half or more of the total waste heat put out by the unit over a year to be utilized in the greenhouse. In addition there is the opportunity to capture the carbon dioxide that is produced by the unit as it first converts methane to pure hydrogen for the fuel cell exhausting the carbon component as carbon dioxide. The key barrier to economic application of such a unit remains high initial cost. Figure 6 illustrates the amounts of the waste energy generated by a 200 kW fuel cell that can be utilized in various size greenhouses. Having significant capacity to store heat enables the greenhouse to use the full daily output when heat is only needed at night. The weather database used for the calculations in the figure is a composite constructed from ten years of records at the Philadelphia International Airport. Another concept investigated is the use of a heat pump for environmental control in a greenhouse. With the continuing rise in the cost of gas and oil relative to electricity noted previously the use of a heat pump, which may generate three to six times the output relative to electricity input, would become economically competitive as the operating cost savings amortize the initial investment. An efficient system can incorporate a water-to-water heat pump using groundwater as a source for heating and/or a sink for cooling. As the equipment is relatively expensive there is significant economic advantage in using energy thermal storage so a smaller unit can run day and night with the heat generated during the day available for night heating. Such a system should be designed to meet only base load heat requirements with a lower cost backup system on gas or oil utilized for peak requirements. As heat pumps provide cooling capacity as well as heating another mode of operation can be considered in which the heat pump provides early stage cooling to the greenhouse. With storage for cool and warm water the heat pump can cool the greenhouse during the day in fall, winter and spring storing the heat for use at night. A significant advantage of such an approach is that the greenhouse may be kept closed longer during periods when only early stage ventilation is needed and ventilation can be reduced under hotter conditions thereby extending the time that carbon dioxide enrichment can be economically employed. Figure 7 illustrates the contributions to the heat requirements that are predicted for various months for a proposed system cooling the greenhouse when needed but drawing on a well at other times to maximize its utilization. The large, energy efficient greenhouse was projected to 12.3 Internal Environmental Control 415
FIGURE 7 Contributions to the heat requirements predicted for various months. (Source: A.J. Both and D.R. Mears) require 43,580 BTU/ft 2 per year and the heat pump with a heating capacity of 3.4 BTU/(hr*ft 2 ) would collect 5,509 BTU/ft 2 per year when doing internal cooling and another 11,221 BTU/ft 2 per year from a well for a total contribution of 38% of the annual requirement. The cooling capacity corresponds to the requirement for first stage cooling. SUMMARY There are substantial differences in the energy requirements of commercial greenhouses determined in large part by the design of the facility but also influenced by the maintenance and management strategies. These differences are so significant that examples can be found in commercial practice where energy consumption per unit growing area will be at least ten times as great as could be achieved. There are excellent sources of information with specific application to various types of greenhouse operations and increasingly this information can be found on websites and some of these will be periodically updated as new information becomes available. Beyond the application of the best design and management practices and the consistent following of maintenance procedures there are also alternatives to fossil fuel consumption that can be pursued and it can be expected that practical examples will increase as new ideas are further refined and developed and the relative price of natural gas and oil continue to escalate. There have been many practical demonstrations of systems burning alternative fuels whose economics depend on the facility designed to take advantage of the fuel and its availability and cost. Beyond that further development of alternative energy systems can be expected. Several potential systems mentioned above have been analyzed well enough to show progress and hopefully will be evaluated on a commercial scale. REFERENCES ___________ Rutgers University Horticultural Engineering Website: http://aesop.rutgers.edu/~horteng/ Bartok, J.W. Jr., 2001. Energy Conservation for Commercial Greenhouses. NRAES-3. NRAES, Ithaca, NY. Both, A.J., D.R. Mears, T.O. Manning, E. Reiss and P.P. Ling. 2007. Evaluating energy savings strategies using heat pumps and energy storage for greenhouses. ASABE Paper No. 074011. ASABE, 2950 Niles Road, St. Joseph, MI 49085-9659. 416 Chapter 12 Controlled-Environment Horticulture
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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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Phloem Tissue Structurally, phloem
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(a) Stalk (b) Culm FIGURE 3-5 Cross
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Scale Compressed stem (a) Whole bul
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Upper epidermis Palisade layer FIGU
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usually occur in xerophytes. In cer
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FIGURE 3-22 Selected common leaf ma
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FIGURE 3-25 Selected common leaf ti
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absorption of water and minerals fr
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Outer bark Inner bark FIGURE 3-37 T
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Anther Filament Stamen FIGURE 3-41
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Exocarp Parts of a typi- FIGURE 3-4
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PRACTICAL EXPERIENCE LABORATORY 1.
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4.1 CLIMATE, WEATHER, AND HORTICULT
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concentration in the atmosphere.A c
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TABLE 4-1 Climatic Adaptation of Se
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and upward. Another important gener
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Rate of photosynthesis mg/sq. dm/hr
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and plants that flower under only c
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times of the year. Growers start th
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content. This section is sometimes
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TABLE 4-7 Soil Mineral Nutrients Es
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Micronutrients (Trace Elements) Mic
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Neutral FIGURE 4-11 A representatio
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4.4 FERTILIZERS Fertilizer sources
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One of the most commonly used contr
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Chlorosis (the yellowing of green l
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Fertilizers may be applied before p
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It is neither practical nor safe to
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Solution: How much of ammonium nitr
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1°C (34°F), the optimum temperatu
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Cellulose sponge Perched water tabl
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Overhead Sprinkler Irrigation Water
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FIGURE 4-19 Furrow irrigation of le
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can self-install an underground irr
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1. Surface drainage. Surface draina
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Secondary Tillage Primary tillage i
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(a) (b) (c) (d) FIGURE 4-20 (Source
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texture. The most commonly used gra
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TABLE 4-11 Selected Standard Mixes
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Steam Pasteurization Steam pasteuri
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Maracher, H. 1986. Mineral nutritio
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5 Plant Physiology PURPOSE AND EXPE
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Growth in an organism follows a cer
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5.1.2 THE ROLE OF SIGNALS IN GROWTH
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waxes are embedded. Waxes consist o
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5.3.1 PHOTOSYNTHESIS Photosynthesis
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CO 2 FIGURE 5-6 The C 4 pathway of
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Growth and Development The general
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TABLE 5-2 Energy Produced from Aero
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Certain plants are adapted to dry e
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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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Page 412 and 413: amount and quality of light. If sup
Page 414 and 415: 12 Controlled-Environment Horticult
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Page 418 and 419: Detached greenhouses have several a
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Page 426 and 427: source of heat for times when the t
Page 428 and 429: FIGURE 12-17 Greenhouse production
Page 430 and 431: FIGURE 12-21 Moving tables allowing
Page 432 and 433: Research program on greenhouse engi
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Page 436 and 437: FIGURE 1 Annual energy required per
Page 438 and 439: This system was demonstrated in a 5
Page 442 and 443: Ekholt, B.A., D.R. Mears, M.S. Gini
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Page 448 and 449: FIGURE 12-27 Motorized ventilation
Page 450 and 451: FIGURE 12-30 Movable internal shade
Page 452 and 453: FIGURE 12-33 A high pressure sodium
Page 454 and 455: Source of Water The quality of loca
Page 456 and 457: FIGURE 12-37 Overhead sprinkler irr
Page 458 and 459: Intermittent Feed Greenhouse plants
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Page 462 and 463: OUTCOMES ASSESSMENT 1. Explain the
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Page 468 and 469: FIGURE 13-1 Greenhouse production o
Page 470 and 471: FIGURE 13-2 Lettuce plug is inserte
Page 472 and 473: 13.8.4 AGGREGATE HYDROPONIC SYSTEMS
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Page 476 and 477: 14 Growing Succulents PURPOSE AND E
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Page 482 and 483: TABLE 14-1 Plant Selected Popular S
Page 484 and 485: (a) (b) FIGURE 14-12 Typical bromel
Page 486 and 487: 14.7.1 WHAT ARE CACTI? 14.7 CACTI C
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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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