钾肥对早、晚稻的增产效果及其合理分配与循环利用的研究

Study on Response of Early Rice and Late Rice to Potassium Fertilizer and Its Optional Distribution

在黄泥沙田和培泥沙田两种水稻土上，证实施用化学钾肥对早、晚稻均有显著增产效果的基础上，通过钾肥分配及其循环利用试验，初步探明把有限的化学钾肥用于早稻，再把提高含钾量的稻草还田，供晚稻再利用，可取得早、晚稻平衡增产，化学钾肥的经济效益最高．

The fixed experiments in two kinds of paddy soils were conducted to study the response of early and laterice to potassium fertilizer and its optional distribution. The results showed the yield of early and late rice wasincreased by potassium fertilizer. The chemical potassium fertilizer received the highest economic return whenthe limited potassium fertilizer was distributed to the early rice and the early rice straw with higher potassiumcontent was returned to the late rice for the high yield production of both early and late rice. This techniquewas different from the usual method of applying the limited potassium fertilizer to the late rice.