稻田三熟制种植模式下钾肥后效试验研究

Research on Residual Effect of Potassium Fertilizer in Flow Aquic Paddy Soil

研究了油-稻-稻种植模式下钾肥的后效应作用,结果表明:钾肥的施用对当季油菜产量的影响较大,增产28.59%.油菜生长期间施用的钾肥对下季早稻的生长有一定的后效作用,早稻生长期间施用的钾肥对下季的晚稻生长有一定的后效作用.由于钾肥对油菜和晚稻的增产作用较大,因此,从经济效益的角度出发,建议油-稻-稻三熟制种植模式下种植油菜和晚稻时多施钾肥,而种植早稻时少施钾肥.

In order to study on residual effect of potassium fertilizer in flow aquic paddy soil, a field experiment was carried out in planting mode of rape - early season rice - late season rice. The results showed that rape yield was significantly influenced by application of potassium fertilizer, and the increasing yield was 28.59%. The early - season rice growth was influenced by application of potassium fertilizer during rape growth. The late - season rice growth was influenced by application of potassium fertilizer during early - season rice growth. The rape and late - season rice yield was influenced by application of potassium fertilizer. Therefore, rape and late season rice growth in planting mode of rape - early season rice -late season rice applied more potassium fertilizer, but early season rice growth was appliedless potassium fertilizer.