摘要
大田试验条件下,研究了施肥对水稻生育后期高产杂交水稻吸氮特性、叶碳氮比及氮肥利用率的影响。结果表明,吸氮量主要集中在生育前期,抽穗期前吸氮量占成熟期的70%以上。皖稻125在适量施氮及氮胁迫条件下氮素积累能力均较强,促进了干物质积累和产量形成。叶碳含量基因型变异较小,且在生育后期总体呈下降趋势。叶碳氮比变异较大,抽穗期、灌浆期及成熟期在无氮区分别较施氮区高28.6%、18.3%、36.4%。适宜的叶碳氮比有利于氮素运转和产量的形成,在适量施氮下,皖稻125的氮肥农学利用率和生理利用效率均最高,分别为13.97和56.5 kg/kg,较汕优63高10.2%和24.4%。
The effects of nitrogen application on the characters of uptake nitrogen and leaf of C/N and nitrogen use efficiency of different high yield hybrid rice varieties were studies under field conditions.The results showed that N uptake amount different were existed at different rice varieties during the period from heading to ripening and the N uptake amount occupied above 70 % at before heading.Wandao125 had stronger uptake nitrogen capacity at condition of lower nitrogen and proper nitrogen,which promoted accumulation of dry matter and yield production.Variation coefficient of the content of leaf carbon between different varieties was lower.C/N of leaf was higher.C/N at the heading,kernel-filling and maturing stages were 28.6%、18.3%、36.4% higher respectively under CK plots than N-application plots.The proper C/N may promote the nitrogen translocation and yield production.Agronomic efficiency and physiological efficiency under proper using nitrogen of Wandao125 were 13.97 kg/kg and 56.5 kg/kg respectively.It was highest in tested cultivars and higher 10.2% and 24.4% than Shanyou63.
出处
《中国土壤与肥料》
CAS
CSCD
北大核心
2011年第2期35-38,共4页
Soil and Fertilizer Sciences in China
基金
科技部星火计划重点项目(2008GA710005)
水稻生物学国家重点实验室项目(09040)
国家863计划项目(2009AA101101)
关键词
水稻
碳氮比
氮肥利用率
rice
carbon-nitrogen ratio
fertilizer-N use efficiency
