秸秆还田与施氮量对盐碱粳稻区土壤养分及产量的影响

Effects of straw returning and nitrogen application on soil nutrients and yield in saline-sodic japonica rice region

为探究盐碱粳稻区秸秆还田条件下施氮量对土壤养分及产量的影响,在吉林省西部盐碱粳稻区进行了大田试验.田间试验以秸秆还田作为主处理,以施氮水平为副处理,秸秆还田分为水稻秸秆秋季水搅浆全量还田和水稻秸秆离田(不还田)2个处理;施氮水平包括:N0(不施氮肥)、N150(150 kg/hm^(2))、N180(180 kg/hm^(2))、N210(210 kg/hm^(2))和N240(240 kg/hm^(2))5个水平.结果表明,秸秆还田增加了土壤有机质、全氮和速效钾含量.秸秆还田水稻地上部生物量和产量分别在N210和N240处理达到最高;秸秆离田水稻地上部生物量和产量均在N180处理达到最高.

In order to explore the effects of nitrogen application on soil nutrients and yield in saline-sodic japonica rice region under straw returning condition,field experiment was carried out in the west of Jilin Province.In this experiment,straw returning was used as the main treatment,and nitrogen application level was used as the secondary treatment.The straw returning was divided into two treatments:total rice straw returning to the field in autumn water pulping and rice straw leaving the field(no returning).The nitrogen application levels were N0(no nitrogen),N150(150 kg/hm^(2)),N180(180 kg/hm^(2)),N210(210 kg/hm^(2))and N240(240 kg/hm^(2)).The results showed that straw returning increased the contents of soil organic matter,total nitrogen and available potassium.The aboveground biomass and rice yield of straw returning were the highest under N210 and N240 treatments,respectively.The aboveground biomass and rice yield of straw leaving the field were the highest both under N180 treatment.