Yoshida - 1981 - Fundamentals of Rice Crop Science

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MINERAL NUTRITION OF RICE 133 Table 3.13. Effects of nutrient supply in culture solution on leaf area, tiller number, dry weight, and nutrient contents in rice. a Nutrient supply Weeks after transplanting 2 4 6 8 10 Complete Low N Low P Low K Complete Low N Low P Low K Complete Low N Low P Low K Complete Low N Low P Low K Complete Low N Low P Low K Complete Low N Low P Low K Leaf area (cm 2 /pot) 312 2280 4616 5734 266 951 1405 1926 207 834 1298 1377 223 832 1230 2943 Tiller number (no./pot) 5.3 41.0 65.0 65.3 3.8 21.0 26.7 34.0 3.8 21.0 32.7 31.0 3.8 31.0 54.0 53.5 Dry wt (g/pot) 1.45 15.6 49.6 81.4 1.17 7.33 18.5 27.8 1.13 6.41 15.4 27.7 1.21 5.63 16.9 33.3 Nitrogen content (% in leaf blades) 4.64 b 3.33 2.37 2.03 4.32 2.66 1.90 1.66 4.57 4.15 3.51 3.15 4.83 4.18 3.19 3.36 Phosphorus content (% in leaf blades) 0.60 0.38 0.23 0.13 0.63 0.53 0.45 0.43 0.23 0.08 0.05 0.03 0.68 0.50 0.25 0.25 Potassium content (% in leaf blades) 2.8 2.8 2.3 2.1 2.9 2.5 1.9 1.8 2.8 2.4 2.4 1.9 2.0 1.0 0.6 0.5 6008 2206 1701 3980 58.3 23.0 29.3 52.5 133.0 39.6 36.6 51.3 1.96 1.64 3.03 3.47 0.18 0.33 0.03 0.25 1.9 1.9 1.6 0.5 a Yoshida and Hayakawa (unpublished). b Underlines indicate nutrient content of the complete versus a particular nutrient to be compared. synthetic rate are estimated at 2% for N, 0.4% for P 2 O 5 , 1% for K 2 O, 0.4% for MgO, and 0.5% for SO 3 . Because of its importance in rice, the relationship between nitrogen and photosynthesis has been studied by many scientists (Table 3.14). In general, leaf photosynthetic rate is correlated linearly or curvilinearly with leaf nitrogen or protein content. The shape of the mathematical form may depend
134 FUNDAMENTALS OF RICE CROP SCIENCE 3.9. Relationship between nutrient content of leaves and photosynthetic activity (Tanaka 1961). Table 3.14. Nitrogen nutrition and photosynthetic rate of single leaves in the rice plant a . Authors Year Result b lshizuka & Tanaka Mitsui & lshii Mitsui & lshii Murata Osada Takano & Tsunoda Takeda Tsuno, Inaba, & Shimizu Yoshida & Coronel 1958 1938 1939 1961 1967 1971 1961 1959 1976 Curvilinear relation between 14 CO 2 assimilation by leaf and N% in leaf blade; 2% N gives maximum assimilation. P n is linearly correlated with N% between 3 and 6% N. P n is linearly correlated with N content per leaf area. Topdressing of N increased P n and N content per leaf area. P n is linearly correlated with protein-N%, protein-N content per leaf area and SLW. P n is linearly correlated with protein-N content per leaf area but not with protein-N%. Quadratic relation between P n and N content per leaf area. Different lightphotosynthesis curves for low and high N content per leaf area. P n is linearly correlated with N%. P n is linearly correlated with N%. P n is linearly correlated with N content per leaf area and with leaf conductance. a Modified from Yoshida and Coronel (1976). b N, nitrogen; P n , net photosynthetic rate; SLW, specific leaf weight.
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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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5.1. PHOTOSYNTHESIS 5.1.1. Photosyn
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PHOTOSYNTHESIS AND RESPIRATION 197
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Photosynthetic characteristics Meas
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A traditional tall variety vs an im
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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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