摘要:
近几年在我省稻田钾肥的肥效明显上升,超过磷肥,有接近氮肥的趋势。氮肥在各类稻田上仍表现良好效果,氮肥不足,穗数减少,用量过多,成穗率低,空壳率增加,穗短粒轻,影响产量。钾肥除盐渍型稻田外,其余各类稻田均表现高效,尤以晚稻田更高些。水稻缺钾,穗短粒少,结实率和千粒重下降。目前我省稻田较为经济合理的氮磷钾养分总用量及其比例为:早稻总用量为13.8～15.7公斤,N:P2O5:K2O为1:0.4～0.5:0.5～0.75;晚稻总用量为10.4～15.9公斤,比例为:0～0.3:0.75～1.250公斤干稻草回田,可代替4公斤K2O的肥效。
Abstract:
In recent years,the effect on potassium fertilizer in paddy field has been obviously going up. It seems to surpass phosphorus fertilizer and even has a tendency to approach the effect of nitrogen fertilizer in Fu-jian. Nitrogen effected well in all sorts of paddy field. If the applying of nitrogen were deficient, the plants showed decreased ear number and effective tillers, increased empty grain, shortten ear, seed weight and yield were also affected.The effect of potassium is very efficient in all sorts of paddy field except salinized soil. If rice were deficient in potassium, the ear would be short, less grain numbers and the thousand-grain weight decreased.In the present, relatively economic and rational quantities for apply ing of nitrogen, potassium and phosphorus, and their proportions are, in early rice, 13.8-15.7kg, the ratio of N:P2O5:K2O equal to 1:0.4-0.5 :0.5-0.75; in late rice, 10.4-15.9kg, N; P2O5:K2O equal to 1:0-0.3: 0.75-1,
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