Nutritional physiology of the rice plants and productivity decline of irrigated rice systems in the tropics

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概要

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• Rice yield declines observed in long-term experiments are associated with N and K deficiencies despite the use of recommended fertilizer rates. Modem rice varieties have an extensive root system, a large N uptake capacity, and produce about 50 kg grain per kg of N uptake. These traits have not changed over the past 30 yearS. Instead, reduction of soil N and K supply contribute to the observed yield declines, and these deficiencies may result from generic processes associated with management practices common to irrigated lowland rice systems. Most other limiting factors are of more local importance. Negative yield trends can be reversed by increasing the rates of applied nutrients. Maintaining high yields requires nutritional balance and attention to disease-nutrient interactions. Evidence from on-farm studies suggest that these same constraints occur in several rice production domains in the lowland tropics of Asia. Achieving continued increases in rice yields will require field-specific soil and fertilizer management to improve the congruence between nutrient supply and crop demand.

著者

• Peng Shaobing

  International Rice Research Institute

• Cassman G.kenneth

  Agronomy Department University Of Nebraska

• Dobermann Achim

  International Rice Research Institute

• Cassman Kenneth

  Agronomy Department, University of Nebraska

関連論文

• Four Decades of Breeding for Varietal Improvement of Irrigated Lowland Rice in the International Rice Research Institute
• Nutritional physiology of the rice plants and productivity decline of irrigated rice systems in the tropics

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