扬州大学学报（农业与生命科学版）2017，Vol.38Issue(2)：69-74,81,7.DOI:10.16872/j.cnki.1671-4652.2017.02.013
氮肥管理对秸秆全量还田双季晚稻土壤固定态铵的影响
Effects of nitrogen management on soil fixed NH4+ in double-rice system with all rice straw returned to the field
摘要
Abstract
Soil fixed NH4+ is an important component of soil nitrogen pool,and its release and fixation contributes to soil effective N supply.In this study,the effects of nitrogen management on soil fixed NH4+ in double-rice system with all rice straw returned to the field was investigated and the relationship between change of soil fixed NH4+ during late rice growth period on grain yield and nitrogen recovery of late rice was analyzed.The results showed that,returning of rice straw without N application decreased fixed NH4+ ammonium content,but fixed NH4+ content was significantly elevated by applying nitrogen under returning of rice straw.Compared with other treatments with reduce N application,the treatment of RN2 displayed the highest fixed NH4+ content.Microbial inoculant application led to a decline of soil fixed NH4+.During the growth period of late rice,the soil fixed NH4+ ammonium decreased at early stage,increased at mid-stage and declined again in the mature period.However,the content of soil fixed NH4+ at harvest was lower than that in early stage,which indicated that the release of fixed NH4+ contributed to soil effective N supply.Changes of fixed NH4+ both in content and rate during tillering and grain filling showed significant negative correlation with grain yield of late rice,and there was a significant positive correlation between change of soil fixed NH4+ content in the whole growth period and nitrogen recovery of late rice.In conclusion,with full returning of rice straw,the treatment of RN1 stabilized the grain yield and increased the N recovery because of its accordance with late rice growth.关键词
水稻/土壤固定态铵/秸秆全量还田/氮肥管理/产量/氮肥利用率Key words
rice/soil fixed NH4+/total rice straw incorporation/nitrogen management/grain yield/nitrogen recovery分类
农业科技引用本文复制引用
顾敏京,左文刚,严漪云,臧彩云,薛伟杰,柏彦超,单玉华,封克..氮肥管理对秸秆全量还田双季晚稻土壤固定态铵的影响[J].扬州大学学报（农业与生命科学版）,2017,38(2):69-74,81,7.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）
