石灰性紫色土高粱肥料效应研究

Study on Fertilizer Effect of Calcareous Purple Soil Sorghum

在川东北石灰性紫色土上,肥料三要素对高粱产量的影响呈抛物线型,氮肥影响特别明显;农学利用率和农学增产率上,氮肥表现最好,与磷钾的差异显著;数据经三元二次方程拟合,属于典型肥料效应方程,并且为N>P2O5>K2O;因子间正向互作,NP>NK>PK。通过方程寻优,最高单产为6287.8kg/hm^2,肥料用量分别为159.2kg/hm^2 N、78.3kg/hm^2 P2O5、140.3kg/hm^2 K2O;生产中结合施肥量、产量及经济效益综合分析,推荐施肥配比方案:137.7~158.9kg/hm^2 N、53.4~67.5kg/hm^2 P2O、106.3~136.7kg/hm^2 K2O。

The results showed that the three factors of fertilizer had a parabolic effect on the yield of sorghum,especially nitrogen fertilizer.In terms of agricultural utilization rate and yield increase,nitrogen had the best performance,which was significantly different from phosphorus and potassium.The data was fitted by the ternary quadratic equation,which belongs to the typical fertilizer effect equation and was N>P2O5>K2O.Forward interaction between factors,NP>NK>PK.The maximum yield was 6 287.8kg/hm2,and the fertilizers were 159.2kg/hm2 N,78.3kg/hm2 P2O5,and 140.3 kg/hm2 K2O,respectively.Based on the comprehensive analysis of fertilizer application,yield and economic benefits,the following fertilization ratio schemes are recommended:137.7-158.9kg/hm2 N,53.4-67.5kg/hm2 P2O5,106.3-136.7 kg/hm2 K2O.