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历史上的因产定肥,一则缺乏科学的产量依据,二则没有测定土壤供氮量的简便方法,应用不方便。本文提出因产定氮的式子是:N_需=(0.018(Y-1.05X)/E_肥。式中:Y为该土壤上的水稻最高可得产量;X为无肥区的基础产量,Y与X之间的统计关系已见于《土壤学报》19卷315页一文中。参数0.018为肥料氮所创造的产量每斤稻谷(含稻秸秆)在本田应吸收氮的量(单位均为斤/亩)。由于消除了土壤氮所创造的产量,故不再存在难以测定土壤供氮的问题。
The history of fertilizer production, a lack of scientific basis for the production, the second is not a simple method of determining the amount of nitrogen in the soil, application is not convenient. In this paper, the formula for producing nitrogen is: N_ = (0.018 (Y-1.05X) / E_f where Y is the highest available yield of rice in this soil; X is the base of no fertilizer area The statistical relationship between yield, Y, and X is found in Soil Science Bulletin, Volume 19, page 315. Parameter 0.018 Yield for Fertilizer Nitrogen The amount of nitrogen that should be absorbed per kg of rice (including rice straw) in Honda Kg / acre.) Eliminating the production of soil nitrogen, there is no longer the problem of measuring soil N availability.