长期不同施肥红壤磷素变化及其对产量的影响

李冬初,王伯仁,黄晶,张杨珠,徐明岗,张淑香,张会民

Change of Phosphorus in Red Soil and Its Effect to Grain Yield Under Long-Term Different Fertilizations

DongChu LI,BoRen WANG,Jing HUANG,YangZhu ZHANG,MingGang XU,ShuXiang ZHANG,HuiMin ZHANG

表3 长期不同施肥磷素农学阈值

Table 3 The critical P value of soil Olsen-P for crop yield (CV) under different long term fertilizations

作物 Crop 样本数 N 线线模型LL 线性-平台模型LP 米切里西方程EXP 农学阈值平均 Mean of CV (mg·kg-1) 农学阈值 CV (mg·kg-1) R2 农学阈值 CV (mg·kg-1) R2 农学阈值 CV (mg·kg-1) R2 小麦 Wheat 108 13.5 0.72** 22.3 0.67** 28.8 0.69** 21.5 玉米 Maize 108 23.4 0.66** 29.2 0.65** 46.0 0.67** 32.9