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氮素是关系到水稻个体新陈代谢与群体增长数量的重要元素,因此,研究高产水稻土壤供氮指标是科学施肥的主要环节。在高产施肥原理一文中(见本刊1982年第4期第29—30页),已经论述过用水稻吸氮加同期土壤铵态氮作指标(其实质是水稻各生育期土壤供应的土壤铵态氮),可以反映“天、地、禾”统一体的基本原理。现就有关指标问题加以总结。 (一)千斤水稻土壤供氧累计指标数量化指标数量化,从下述4个方面确立。 1.研究植稻土壤供氮曲线图象,明确不同土壤,不同品种,不同造别,土壤供氮累计曲线是带常量的变形双曲线,这个曲线反映水稻一生的土壤供氮数量的动态变化规律。
Nitrogen is an important element in the metabolism and population growth of rice individuals. Therefore, it is a major part of scientific fertilization to study the nitrogen supply index of high-yielding paddy soils. In a paper on high-yield fertilization principles (see Journal, No. 4, 1982, pp. 29-30), the use of rice nitrogen uptake over the same period of ammonium nitrogen as an indicator (in essence, soil ammonium State nitrogen), can reflect the “Heaven, Earth, Wo” unity of the basic principles. Now on the issue of indicators to be summed up. (A) Thousand kilograms of paddy soil oxygen quantitative indicator quantitative indicators, from the following four aspects established. 1. To study the image of nitrogen supply in paddy soils, clarify different soil, different varieties, different make, the cumulative curve of soil nitrogen supply is a hyperbolic deformation curve with constant, this curve reflects the law of dynamic changes of soil nitrogen supply in a lifetime .