Study on Residual Effect of Phosphorus Fertilizer under Planting Mode of Rape-early season rice-late season rice

In order to study residual effect of phosphorus fertilizer in flow aquic paddy soil,a field experiment was carried out under planting mode of rape-early season rice-late season rice.The results showed that rape yield was influenced by application of phosphorus fertilizer,and least increasing yield was 17.01%.The early-season rice growth was influenced by application of phosphorus fertilizer during rape growth.The late-season rice growth was influenced by application of phosphorus fertilizer during early-season rice growth.The late-season rice yield wasn't influenced by application of phosphorus fertilizer.Therefore,it was suggerted to apply phosphorus during rape grow the and apply nitroger and potassium fertilizers during the growth of early season rice and late season rice to get te best economical benefit.