扬州大学学报（农业与生命科学版）2017，Vol.38Issue(2)：75-81,7.DOI:10.16872/j.cnki.1671-4652.2017.02.014
氮肥运筹对秸秆全量还田双季稻氮产量及氮素吸收利用的影响
Effects of nitrogen management on grain yield and nitrogen use of double cropping rice system with all rice straw returned to the field
摘要
Abstract
Returning in full amount to field is the key way to realize recycling of crop straws.However,considerable change of effective nitrogen supply dynamic occurs in the soil with all crop straw returning,which may affect crop yield and nitrogen efficiency.In this study,the effects of nitrogen management on yield and nitrogen utilization in double cropping rice system with full rice straw returning were investigated to formulate nitrogen application strategy for early and late rice.The results showed that,under full returning of rice straw,recommended N (RN) treatments reduced grain yield of early rice due to the decline in number of spikelets per panicle and 1000-grain-weight,but yield difference between RN and FN treatment was not significant.Meanwhile,grain yield of late rice with RN treatments was more stable than that of early rice with the same treatments.RN combined with higher topdressing ratio,namely RN4∶6 in this experiment improved nitrogen accumulation by rice plant and elevated nitrogen recovery in both early and late rice.These effects were more apparent when microbial inoculant was used.In conclusion,with full returning of rice straw,moderate nitrogen fertilizer reduction and higher topdressing ratio can improve nitrogen uptake by rice plant and nitrogen recovery without significant yield loss in double rice cropping system.Microbial inoculant may help to stabilize rice yield.关键词
双季稻/稻草全量还田/氮素运筹/产量/氮肥利用Key words
double cropping rice/total rice straw incorporation/nitrogen management/yield/nitrogen utilization分类
农业科技引用本文复制引用
左文刚,黄顾林,陈亚斯,朱晓雯,沈袁玲,柏彦超,单玉华,封克..氮肥运筹对秸秆全量还田双季稻氮产量及氮素吸收利用的影响[J].扬州大学学报（农业与生命科学版）,2017,38(2):75-81,7.基金项目
国家重点基础研究发展计划项目(973-2013CB127404) （973-2013CB127404）
江苏省农业科技支撑计划项目(BE2013360、BE2014345) （BE2013360、BE2014345）
