Effect of Fertilizer Application of Rice Season on Yield and Nutrition Accumulation of Green Manure

Field experiment was carried out to study the applied amounts of N,P,K fertilizers on the yields and nutrient accumulations of green manure in order to decide the optimal fertilizer amounts in the condition of rice-Chinese milk vetch rotation system.The results showed that the fresh grass yields with N,P,K fertilizer treatments increased by 27.9%-40.9%,12.6%-37.2% and 21.4%-46.2% than no N,P,K fertilizer treatments respectively.Among N fertilizer treatments,N accumulation of the treatments with N fertilizer increased by 48.8%-62.3% than no N applied,C,N,K accumulation reached to the maximal values with 142.4 kg/hm2N fertilizer applied,P accumulation reached to the maximal value with 71.2 kg/hm2N fertilizer applied.Among P fertilizer treatments,P accumulation of the treatments with P fertilizer increased by 33.0%-78.3% than no P treatments,C,N,P,K accumulations reached the maximal values with 49.1 kg/hm2P fertilizer applied.K accumulation of the treatments with K fertilizer increased by 22.2%-44.8% than no K treatments,among K fertilizer treatments,C,N,P,K accumulations reached the maximal values when K fertilizer amount were 67.5 and 101.2 kg/hm2 in the rice season,and those two treatments had little difference.Under this experiment condition,the yield and C,N,P,K accumulations of green manure were 15 833 and 929.2,44.6,5.8 and 45.9 kg/hm2 respectively,while N,P,K fertilizer amounts were 142.4,49.1 and 67.5(or 101.2) kg/hm2in the rice season.