论文部分内容阅读
比照常规施肥量(早稻氮、磷、钾分别按150、60、90千克/公顷施入,晚稻分别按180、75、90千克/公顷施入),采取不同减量施肥配以冬季种植黑麦草、紫云英、油菜的耕作方式,研究双季稻种植模式下氮、磷的适宜施用量。结果表明:氮和磷比常规施肥量分别减量20%、30%,处理组水稻的产量变化率为-11.48%~1.94%;施硫包衣尿素,氮和磷比常规施肥量均减量30%,处理组水稻的产量变化率为-13.24%~3.87%;施复合肥,氮和磷比常规施肥量均减量30%,处理组水稻的增产率为0.52%~13.70%;不同减量施肥处理可使径流水氮流失量减少31.69%~47.74%,磷流失量降低11.77%~64.71%;使用复合肥的
According to the conventional fertilization rate (150, 60 and 90 kg / ha for the early rice, and 180, 75 and 90 kg / ha for the late rice respectively), fertilization with different decrements and winter planting of ryegrass , Astragalus sinicus and rape were studied, and the suitable application amount of nitrogen and phosphorus under double cropping rice planting mode was studied. The results showed that the yield of nitrogen and phosphorus decreased by 20% and 30% respectively compared with the conventional fertilization, the yield of rice in the treatment group was -11.48% -1.94% The yield of rice in the treatment group was -13.24% ~ 3.87%, while that in the treatment group was 30% less than the conventional fertilization, and the yield of rice in the treatment group was 0.52% ~ 13.70% The amount of nitrogen loss in runoff could decrease by 31.69% -47.74% and the amount of phosphorus loss by 11.77% -64.71% with the amount of fertilizer application. The use of compound fertilizer