不同施氮量下籼稻生育后期干物质积累及氮素的吸收利用  

EFFECT OF DIFFERENT NITROGEN LEVEL ON DRY MATTER ACCUMULATION AND NITROGEN UPTAKE AT REPRODUCTIVE STAGE OF INDICA RICE

作　　者：唐梅[1] 邓国富[1] 莫海玲[1] 于松保[1] 阎勇[1] 陈荣林[1] 

机构地区：[1]广西农业科学院水稻研究所,广西南宁530007

出　　处：《核农学报》2012年第8期1178-1182,共5页Journal of Nuclear Agricultural Sciences

基　　金：2011年广西南宁青秀区科学研究与技术开发计划项目(合同编号:2011N15)

摘　　要：以早籼稻品种特优63、晚籼稻品种美优998为供试材料,探索籼稻品种在不同施氮量条件下其生育后期的干物质积累及对氮素吸收利用规律。结果表明,增施氮肥可提高籼稻品种生育后期植株各器官(茎鞘、叶、穗)的干物质积累量及氮素的吸收;同时加速植株茎鞘、叶部分干物质及养分向穗部转移;增施氮肥虽导致结实率、千粒重下降,但通过提高穗数,甚至每穗粒数,使产量显著提高。在施纯氮234.0kg/hm2条件下,早籼、晚籼稻品种的产量比对照分别增产45.2%和36.8%。此外,增施氮肥极显著提高早、晚籼稻品种的氮素吸收利用率。研究表明适当增加施氮量有利于提高籼稻品种产量、氮素的吸收及利用。Two early indica rice varieties of Teyou 63 and Meiyou 998 were employed to study characteristics of the dry matter accumulation and N uptake and utilization of Indica rice at reproductive stage under different N levels.Results showed that high N rate improved the total dry matter accumulation and N content of leaf,panicle,stem and sheath of Indica rice.Meanwhile,it accelerated the dry matter and N transportation from leaf stem and sheath to panicle.Seed setting rate,and 1000-grain weight were significantly reduced by high N rate,however,panicle number and even grain number were significantly improved as well as rice yield.Under the application of pure N 234.0kg/hm2 conditions,the yield of Early and late Indica rice increased by 45.2% and 36.8%,respectively.In addition,high N rate significanlly increased N use efficiency of early and late Indica rice.These findings suggested that moderate-higher N rate improved rice yield and N use efficiency.

关 键 词：氮肥 籼稻 干物质积累 氮素利用率 

分 类 号：S511.21[农业科学—作物学]