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在1981-1982年试验基础上,1983-1987年又进行了小麦氮磷肥配合回归设计试验.采取二因素三水平9个处理和二因素五水平12个处理二组,结果用PC-1500计算机建立了氮磷效应曲面方程,绘制出不同肥力土壤氮磷效应曲面图、等产线图及偏回归线图,为小麦最佳施肥量提供直观信息.研究表明:当前淮北平原氮磷肥平均最佳用量为14.1公斤,其中氮肥9.3公斤,相当于尿素20公斤,磷肥4.8公斤,相当于铜陵磷肥35公斤,氮磷比1:0.51.高肥力土壤应减少磷肥用量,一般保持在氮磷比为1:0.3为宜;中、低肥力土壤以1:0.6为宜.
Based on the experiment of 1981-1982, a regression experiment was conducted between 1983 and 1987 to study the combination of nitrogen and phosphate fertilizers in wheat.The results showed that there were 9 treatments of two factors and three levels and 12 treatments of two factors and five levels, and the results were set up by PC-1500 computer The equation of surface nitrogen and phosphorus effect was plotted, and surface maps of nitrogen and phosphorus effect, contour map and partial regression map were plotted for different fertility so as to provide visual information for the optimal fertilization rate of wheat.The research shows that the average optimum nitrogen and phosphorus content in Huaibei Plain is 14.1 kg, of which nitrogen fertilizer 9.3 kg, equivalent to 20 kg of urea, phosphate fertilizer 4.8 kg, equivalent to 35 kg of Tongling phosphate, N: P ratio of 1: 0.51 High fertility of soil should reduce the amount of phosphate fertilizer, generally maintained at the N: P ratio of 1: 0.3 Appropriate; medium and low fertility of soil to 1: 0.6 is appropriate.