土壤养分供应量的生物估测及应用

Bio-Estimation Method for Quantities of Nutrient Supply by Soil and Its Application

通过氮磷肥效反应二次多项式求得土壤氮磷养分当量（土壤养分供应量相当的肥料量），并得到土壤氮磷养分当量与作物不施肥产量之间极显著的指数回归关系，以估测土壤养分当量。以养分总量与作物产量进行回归，其模式各效应系数不受土壤有关养分含量的影响，可以建立生态区的平均模式。同时，可求得作物需要的最大养分量和最大施肥量（最大养分量与土壤养分当量之差）以指导推荐施肥。

By utilizing fertilizer efficiency equation,the nutrient equivalent quanti-ties of soil nitrogen and phosphorus were obtained(which is equivalent to the fertilizerquantities.)And then,the most significant exponential regression is also establishedbetween the nutrient equivalent quantities of soil and crop yields so as to estimate thenutrient equivalent quantities of soil.Bothe the total nutrient quantities and crop yieldswere regressed.As a result,each efficient coefficient was not affected by some relatedsoil nutrients so that the avaerage model in the ecological zone can be established.Atthe same time, the nutrient critical values can be calculated.The naximum fertilizerquantities(nutrient critical value venus nutrient equivalent quantity of soil)needed forcrop may be utilized to guide prescription fertilization.