对应用土测值直接推荐磷肥用量方法的田间校验

田间试验得出:玉米施用磷肥最大效益与最高产量用量同土壤有效磷测得值的两个函数方程及其代表吉林省有效磷含量不同土壤的磷肥最大效益与最高产量推荐量;通过土壤有效磷含量不同(2.1～81.2mg/kg)的白浆土、黑土和淡黑钙土,74个磷肥量级田间校验得出,玉米施用磷肥最大效益与最高产量用量及其变幅(0～109.5 kg/hm2与10.1～125 kg/hm2);通过上述两项结果运算得出,"应用土测值直接推荐磷肥最佳用量法"的准确程度(田间校验获得的实际量与推荐量的吻合率高达92%)和精度(田间校验获得的实际量与推荐量的差值仅仅为-14.7%～15.3%与-13.1%～13.9%)均较高。

Field Calibration on Determining Optimum P Fertilizer Rates According the Soil Available Phosphorus Contents

Through field experiment,two function equations of p fertilizer rates for the biggest benefit and the highest yields with the soil available P were gotten.The P recommendation rates for the biggest benefit and the highest yields under the different available soil P in Jilin province were determined.Through 74 field experiments conducted on the planosol soils,black soils and chernozem soils with the different soil P contents(2.1-81.2ppm),we got the P rates for the biggest benefit and the highest yields and variation ranges between them(0-159 kg/ha and 10.1-12.5kg/ha.).Through the two above results we found that the accuracy and precision was high on determining the optimum P fertilizer rates according to the soil available P contents.