水土保持学报2012，Vol.26Issue(5)：118-122,5.
氮肥运筹对稻茬小麦土壤硝态氮含量、根系生长及氮素利用的影响
Effect of Nitrogen Application on Soil Nitrate Nitrogen Content, Root Growth and Nitrogen Utilization of Winter Wheat in Rice-Wheat Rotation
摘要
Abstract
Field experiments with Ninmai 9(Triticum aestivum L.) were conducted in Nanjing to investigate the effects of nitrogen(N) application rates and basal-topdressing ratios on soil nitrate nitrogen content,root growth,N accumulation,grain yield and N utilization efficiency in 2008-2010.The results showed that high basal N rate enhanced NO-3-N content in the soil layer of 0-60 cm before jointing,and NO-3-N leached to deeper soil layer with plant development stages.The NO-3-N content in 0-40 cm soil layer at booting increased with the increase of topdressing N rate at jointing,NO-3-N leached to 40-60 cm soil layer in the treatment N300 and N3/7.The roots mostly grew in 0-20 cm soil layer at different growth stage;root length density increased as the basal N rate increased before jointing and also increased with an increase of the topdressing N dose after jointing.For each N treatment,the uptake of N was the highest in the duration from jointing to anthesis stage.Grain yield,N accumulation amount and N utilization efficiency increased at the appropriate N rate and topdressing N ratio.Data from two growth seasons showed that properly reducing nitrogen rate and increasing topdressing N ratio gave better root growth,increased grain yield,plant N uptake and N utilization efficiency,and reduced leaching loss of NO-3-N.关键词
氮肥运筹/冬小麦/土壤硝态氮/根系生长/氮素利用Key words
nitrogen application/winter wheat/soil nitrate nitrogen/root growth/nitrogen utilization分类
农业科技引用本文复制引用
石祖梁,杨四军,张传辉,顾克军..氮肥运筹对稻茬小麦土壤硝态氮含量、根系生长及氮素利用的影响[J].水土保持学报,2012,26(5):118-122,5.基金项目
江苏省农业科技自主创新项目[CX（11）2031] （）
