扬州大学学报（农业与生命科学版）2012，Vol.33Issue(4)：39-45,71,8.
不同播期直播稻氮素吸收、利用效率的差异
Differences of nitrogen absorption and utilization efficiency in direct seeding rice with different sowing date
摘要
Abstract
Field experiments were conducted to compare the differences and relationships among yield, nitrogen(N) accumulation, N uptake rate and N use efficiency, with four representative rice cultivars of three types of early-maturing late japonica rice,late-maturing medium japonica rice and medium-maturing medium japonica rice (including japonica conventional rice and japonica hybrid rice) as experimental materials directly seeded at different sowing date. The results showed that: along with the delayed sowing date, (1) the yields decreased significantly or very significantly,which was caused by the decline of spikelets per panicle and filled grain percentage, while panicles and 1000-grain weight had a little change; (2) N content in plant increased in jointing stage increased but decreased in heading and maturity stage; (3) N uptake in plant of jointing, heading and maturity showed a significant downward trend; (4) N accumulation before jointing decreased, but its ratio to total rised, N accumulation and its ratio to total both from jointing to heading and from heading to maturity showed a gradual downward trend. (5) N uptake rate from sowing to jointing rised, but both from jointing to heading and from heading to maturity showed a significant or very significant downward trend. (6) N recovery N agronomic efficiency, N physiological efficiency and N partial productivity showed a downward trend of different degrees. (7) Correlation analysis indicated that there existed significant or very significant positive correlations between yield and N accumulation, N uptake rate and N use efficiency except N uptake rate from jointing to heading. Under the experimental conditions,compared with late sowing, yield, N uptake of every stage,N accumulation of every period,N uptake rate after jointing and N use efficiency of direct seeding rice which sowed early were higher. It was obvious that early sowing of direct seeding rice is in favor of the N efficient absorption and utilization and high yield.关键词
直播稻/播期/产量/氮素积累量/氮素吸收速率/氮素利用效率Key words
direct seeding rice/ sowing date/ yield/ N accumulation/ N uptake rate/ N utilization efficiency分类
农业科技引用本文复制引用
霍中洋,姚义,张洪程,夏炎,倪晓诚,戴其根,许轲,魏海燕..不同播期直播稻氮素吸收、利用效率的差异[J].扬州大学学报（农业与生命科学版）,2012,33(4):39-45,71,8.基金项目
国家"十二五"科技支撑计划重大项目(973-2011BAD16B03) （973-2011BAD16B03）
江苏省科技支撑计划重大项目(BE2009425) （BE2009425）
江苏省科技支撑计划项目(BE2011449) （BE2011449）
超级稻配套栽培技术开发与技术集成[农财发(2012)14号]. （2012）
