应用~(15)N对花生最佳氮磷配比的研究

1985～1986年应用~(15)N标记氮肥,对不同氮磷配比的肥料效应及花生对氮磷肥的吸收利用进行了研究.两年三组试验结果表明,在全氮含量低(5～6级)、速效磷含量中等偏上(3级)的土壤条件下,磷肥对花生的增产效果高于氮肥,氮磷配施好于氮磷单施,N:P=1:1.5效果最佳,其次是1:1和1:2.大田微区氮磷配施,氮肥利用率提高4.9%,氮肥在土壤中残留率增加3.6%,氮肥损失率减少8.5%.

A STUDY ON OPTIMUM PROPORTION OF N AND P FOR PEANUT WITH (15)~N-LABELED FERTILIZER

The fertilizer effect of different proportions of N and P, and their absorption by peanut were studied with ~(15)N—labeled fertilizer during 1985-1986. The results showed that the effect of P on pod yields was better than that of N when the content of total N in soil was lower ( grade 5-6 ) and the available P was middle or more ( grade 3 ). It was better to apply N mixed with P than either alone and the best proportion of N and P was 1 :1.5, followed by 1:1 and 1:2. By this way, the utilization ratio and residual amount in soil of N were increased by 4.9% and 3.6%, respectively, and N loss was decreased by 8.5%.