Effects of different fertilizing methods on absorption and utilization of nutrient of rice plants under reducing the amount of mineral fertilizer after turning under Chinese milk vetch

A field experiment was carried out to study the effects of different methods of fertilization on absorption and utilization of nutrient of rice plants under reducing the amount of chemical fertilizer and turning under equivalent green manure.The results showed that applying green manure 22 500 kg/ha combined application of 80% chemical fertilizer,comparing with traditional methods of fertilization,the other ways increased the N and P contents in stem of early rice by 1.0%～13.7%,6.5%～26.2% respectively,but decreased the content of paddy grain by 6.0%～23.0%.Othermore,the way which was basal:tillering fertilizer:panicle fertilizer = 0:7:3 decreased the content of P in paddy grain of early rice,but increased the content of content of K in stalk of early rice and paddy grain of later rice.Without basal and tillering fertilizer:panicle fertilizer = 5:5 increased the content of N of in paddy grain of later rice,but the method which was basal:tillering fertilizer:panicle fertilizer = 0:10:0 increased the content of P in paddy grain of later rice;combined application of 60% chemical fertilizer,the other fertilization methods increased the content of N,K in paddy grain of early rice by 24.6%～34.6%,8.8%～15.7% respectively,and the content of P in stalk of later rice by 5.2%～60.9%,but decreased the content of P in stalk of early rice by 10.7%～44.3%,and the methods which were without basal fertilizer decreased the content of N in stalk of early rice by 2.4%～47.4%.Combined application of 60%～80% chemical fertilizer,comparing with traditional fertilizing method,the way which was basal:tillering fertilizer:panicle fertilizer = 0:7:3 was helpful to increase the effective tiller number and yield of buth earlier and latter rice plants.