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作物产量随环境诸因素的变化而变。在其他条件基本保持一致,只有肥料用量不同时,产量则主要随施肥量而变。由于这种变化服从于经验公式,因此,我们可以通过一定的数学摸式,即通过施肥效应回归方程来研究施肥量和产量之间的数量关系,确定不同条件下的经济合理施肥量。描述施肥效应的数学摸式是多种多样的。联合国粮农组织认为米采利希指数曲线方程、二次曲线方程和平方根方程比较满意。从国内的资料来看,二次曲线方程对多数试验都能取得较好的拟合效果,因而应用更广泛些。
Crop yield varies with various environmental factors. In other conditions are basically the same, only when the amount of fertilizer is not the same, the output is mainly with the amount of fertilizer and change. Since this change is subject to the empirical formula, we can study the relationship between the amount of fertilizer and the yield through a mathematical model, that is, through the regression equation of fertilization effect, to determine the economic and reasonable amount of fertilizer under different conditions. The mathematical modalities that describe fertilizer effects are varied. The UN Food and Agriculture Organization considers the Mitchell index exponential curve equation, quadratic curve equation and square root equation more satisfactory. From the domestic data, quadratic curve equation for most tests can get a better fitting effect, and thus more widely used.