Yoshida - 1981 - Fundamentals of Rice Crop Science

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NUTRITIONAL DISORDERS 185 Table 4.5. Recommended procedures for chemical analysis of rice tissues. a Element or Digestion or constituent extraction Method of analysis N Kjeldahl method Volumetric P Ternary mixture Colorimetric Al digestion } Fe Si Ternary mixture Gravimetric K digestion or dry ashing HCL extraction or Flame photometric Na water extraction Ca } Mg HCL extraction Atomic absorption Mn spectrophotometer Zn Cu B HCI extraction Colorimetric CI Water extraction Volumetric Chlorophyll Acetone extraction Sugar } Alcohol extraction Colorimetric Starch Perchloric acid extraction a Yoshida et al (1976). e. Critical concentrations for deficiency and toxicity. The critical contents of various elements for deficiency and toxicity in the rice plant are summarized in Table 4.7. The critical content is subject to modification according to the criteria that define the disorders, the status of other elements or substances in the soil or plant, the growth stages of the plant, the varieties, and the climatic conditions. The critical content obtained from a greenhouse study is sometimes too high and not applicable to field crops. For these reasons, Table 4.7 should be used only as a guide for diagnosis. Table 4.6. Analysis of standard plant sample by 7 persons. a Analyst K (%) Mg (%) Mn (ppm) Cu (ppm) Zn (ppm) A B C D E F G 2.52 ± 0.03 – 17.1 ± 0.2 6.7 ± 0.7 28.4 ± 1.1 2.55 ± 0.01 – 18.2 ± 0.5 7.3 ± 1.1 29.0 ± 0.7 2.46 ± 0.01 0.178 ± 0.000 17.5 ± 0.0 5.6 ± 0.1 29.4 ± 0.5 2.42 ± 0.01 0.121 ± 0.009 20.0 ± 0.0 5.0 ± 0.1 35.0 ± 0.4 3.16 ± 0.08 0.176 ± 0.003 15.6 ± 1.3 9.1 ± 2.3 39.7 ± 6.3 2.76 ± 0.03 0.162 ± 0.025 14.1 ± 0.9 3.7 ± 0.1 31.3 ± 1.0 2.44 ± 0.01 – 17.6 ± 0.1 – 28.9 ± 0.2 a Yoshida et al (1976).
186 FUNDAMENTALS OF RICE CROP SCIENCE Table 4.7. Critical contents of various elements for deficiency and toxicity in the rice plant. a Deficiency (D) Critical Plant part Growth Element or toxicity (T) content analyzed stage N D 2.5% Leaf blade P D 0.1% Leaf blade T 1.0% Straw K D 1.0% Straw D 1.0% Leaf blade Ca D 0.15% Straw Mg D 0.10% Straw S D 0.16% Shoot D 0.06% Straw Si D 5.0% Straw Fe D 70 ppm Leaf blade T 300 ppm Leaf blade Zn D 10 ppm Shoot T >1500 ppm Straw Mn D 20 ppm Shoot T 7,000 ppm Shoot B D
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FOREWORD Rice is vital to more than
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CONTENTS Foreword Preface GROWTH AN
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3.2. Adaptation to Submerged Soils
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4.5. Corrective Measures for Nutrit
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1 .1. OUTLINE OF THE LIFE HISTORY T
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GROWTH AND DEVELOPMENT OF THE RICE
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66 FUNDAMENTALS OF RICE CROP SCIENC
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100 FUNDAMENTALS OF RICE CROP SCIEN
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Table 7.6. An example of high yield
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REFERENCES AGRICULTURAL POLICY STUD
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Yoshida - 1981 - Fundamentals of Rice Crop Science

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