紫云英翻压量对单季晚稻养分吸收和产量的影响

Effects of incoporation amounts of Chinese milk vetch on nutrient uptake and yield of single cropping late rice

通过2年田间试验，研究了不同紫云英翻压量对单季晚稻养分吸收、 养分利用效率和产量的影响，并以此确定紫云英鲜草的最佳翻压量。试验设CK（不施肥），CF（常规施化肥）和4个紫云英鲜草翻压量（30、 60、 90、 120 t/hm^2）共6个处理。结果表明，在所有紫云英翻压处理中，稻谷中氮、 磷、 钾吸收量，水稻氮、 磷、 钾的养分农学利用效率和稻谷产量均以翻压紫云英鲜草60 t/hm^2处理最高。与不施肥处理相比，施化肥和紫云英翻压处理分别增加稻谷产量11.8% 和7.4%1~3.5%。将紫云英作为单季晚稻的唯一肥源不会产生僵苗现象，并可获得高产。

A field experiment was conducted to explore effects of different application rates of Chinese milk vetch on nutrient uptakes, nutrient use efficiencies, and yields of single cropping late rice and to determine the optimal application rate of fresh Chinese milk vetch in the Jiangtang Agricultural Experiment Station, Jinhua city, Zhejiang province in 2011-2012. There were six treatments, CK （no fertilizers）, CF （conventional fertilization）, and 4 levels （30, 60, 90, and 120 t/ha） of Chinese milk vetch. Experimental results show that in all the treatments of application of Chinese milk vetch, the maximum increases of N, P and K uptakes by rice plants, agronomic use efficiencies of N, P and K, and rice grain yields are obtained from the treatment with 60 t/ha fresh Chinese milk vetch. Compared with CK, the applications of chemical fertilizers and the incoporation of Chinese milk vetch increase rice grain yields by 11.8% and 7.4%-13.5%, respectively. In the cropping system of Chinese milk vetch／｜single cropping late rice, Chinese milk vetch turned into the soil before the planting of rice seedlings will not result in the runt seedling, leading to a higher yield.