水稻季施肥对后季绿肥物质养分积累的影响

田间试验条件下，研究水稻季不同氮、磷、钾肥用量对后季绿肥物质养分积累的影响，为水稻-紫云英轮作条件下适宜化肥用量的确定提供依据。结果表明，水稻季施氮、磷、钾肥处理的绿肥鲜草产量分别较不施氮、磷、钾肥处理增加27.9% ~ 40.9%、12.6% ~ 37.2%、21.4% ~ 46.2%。水稻季不同氮肥处理比较，施氮处理的氮积累量较不施氮处理增加48.8% ~ 62.3%，氮肥（N）用量为142.4 kg/hm2时，绿肥碳、氮、钾积累量最高，氮肥用量为71.2 kg/hm2时，绿肥磷积累量最高。水稻季不同磷肥处理比较，施磷处理的绿肥磷积累量较不施磷处理增加33.0% ~ 78.3%，磷肥（P）用量为49.1 kg/hm2时绿肥的碳、氮、磷、钾积累量均最高。水稻季施钾处理的绿肥钾积累量较不施钾处理增加22.2% ~ 44.8%，水稻季钾肥（K）用量为67.5 kg/hm2和101.2 kg/hm2时，绿肥的碳、氮、磷、钾积累量较高，且两处理间相差较小。本试验条件下，水稻季氮、磷、钾用量分别为142.4、49.1、67.5（或101.2）kg/hm2时，绿肥的产量及碳、氮、磷、钾积累量最高，分别为15 833 kg/hm2和929.2、44.6、5.8、45.9 kg/hm2。

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/hm2 N fertilizer applied, P accumulation reached to the maximal value with 71.2 kg/hm2 N 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/hm2 P 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/hm2 in the rice season.