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经过多年产量验证,以调控土壤氮素供应指标为主的水稻高产施肥法(详见本刊1982年第2期19-22页)之所以能获得高产稳产,其基本原理如下.(一)适应天气变化的基本原理气候对产量的影响,在一般情况下,日照时数是影响产量的主要因素.现就日照对土壤供氮、植株吸氮的影响阐述如下:土壤铵态氮是水稻吸收的氮素类型,用水稻吸氮加同期土壤铵态氮(两者都以斤、亩计算)作为水稻各生育期供氮累计指标,可反映水稻、土壤氮素在特定光、温作用下的供求平衡.不论天气如何变化,水稻各生育期的供氮指标应为一常量,但水稻吸氮和土壤供氮却受光、温的影响而不同,在同一季节里,阳光的
After years of production verification, the principle of high yield and fertility of rice, which regulates the supply of soil nitrogen, has been able to achieve high and stable yield. The basic principles are as follows: 1. Adaptation The basic principle of weather changes climate on the yield, in general, the sunshine hours is the main factor affecting the yield.Now the sunshine on soil nitrogen, plant nitrogen uptake are described as follows: Soil ammonium nitrogen is absorbed by rice Nitrogen types, using rice nitrogen uptake and soil ammonium nitrogen (both in pounds and mus) over the same period as a cumulative index of nitrogen supply in different growth stages of rice, can reflect the supply and demand of rice and soil nitrogen under specific light and temperature No matter how the weather changes, the nitrogen supply index of rice should be a constant during each growth period, but the nitrogen uptake by rice and soil nitrogen supply are affected by light and temperature. In the same season,