玉米测土配方施肥技术参数研究

在中等偏上土壤肥力棕壤上开展玉米氮磷钾5处理田间试验。试验结果表明,玉米100kg产量吸氮量为1.81kg～2.53kg,不同施肥配比养分吸收量不同,施肥配比越全面,吸氮量越多;100kg吸磷量(P2O5)1.1kg左右;100kg吸钾量(K2O)1.5kg左右。尿素中氮素利用率50%;普通过磷酸钙中磷(P2O5)利用率为18.8%,氯化钾中钾素利用率为36.5%,尿素和过磷酸钙的利用率较正常,氯化钾利用率偏低,说明氯化钾施用量偏高。土壤氮的校正系数为46.9%,土壤中磷的校正系数为66.1%,钾的校正系数为51.4%。

The Parameters in Soil Test and Recommended Fertilization for Corn

The experiments with 5 treatments were conducted in brown earth with higher fertility levels in order to gain the parameters of soil analysis and recommended fertilization for maize. The results showed that the uptake amounts of N ,P2O5 and K2O by maize were 1.81kg～2.53kg,about 1.1kg and 1.5kg. The utilization rates of N,P2O5 and K2O were 50%,18.8% and 36.5%. The correction coefficients of soil N ,P2O2 and K2O were 45.2%,66.1% and 51.4%.