摘要
用~(15)N 标记氮素化肥,在低肥力砾质粗砂土和砾质粗砂壤土盆栽条件下,亩施纯氮2.5～7.5kg,花生对化肥供氮的利用率为48.53%(40.80%～62.88%),土中残留率33.06%(26.87%～38.13%),损失率18.41%(3.34%～32.33%)。随氮肥用量的增加,利用率下降,损失率增加。花生植株体总氮中,肥料供氮占6.86%(3.24%～10.98%),土壤供氮占28.29%(23.91%～34.58%),根瘤固氮占64.86%(54.78%～70.74%)。不施肥处理土壤供氮占12.52%～18.16%,根瘤固氮占87.46%～81.48%。花生荚果产量各处理间差异不显著。
With pot experiment in gravelly sandy soil with low fertility,we used ~(15)N to labell N fertilizer.while 2.5～7.5Kg N Per mu was applied the utilization rate of N fertilizer of peanut was 48.5%(40.80%～62.88%) The soil residual rate of N fertilizer was 33.06%(26.87%～38.13%).The loss rate was 18.41%(3.34%～32.33%).With the increase of N fertilizer, the utilzation rate would decrease,while the loss rate would increase Among the total N amount in peanut plant,6.85%(3.24%～10.98%)came from then in the soil,64.86%(54.78%～70.74%)from fixed-N by nodule bacteria.Under the treatments without the application of N fertilizer,87.46%～81.48% N was from fixed N by nodule bacteria and 12.52%～18.16% was from the soil.There was no significant difference in these treatments with pods yields.
出处
《莱阳农学院学报》
1989年第1期21-27,共7页
Journal of Laiyang Agricultural College
关键词
^15N
氮肥
土壤供氮
根瘤固氮
花生
peanut
(15)~N
N from fertilizer
N fertilizer
N from nodule bacteria
