蓉18A系列杂交水稻品种氮肥利用特性初步研究  

Characteristics of Nitrogen Fertilizer Utilization of Hybrid Rice Combinations of Rong 18A

作　　者：徐敬洪[1] 蔡良俊[1] 沈超[1] 张帆[1] 王富全[1] 文勇[1] 袁亚章[1] 李志义[1] 杨震[1] 

机构地区：[1]成都市农林科学院作物研究所,四川温江611130

出　　处：《杂交水稻》2016年第2期68-71,共4页Hybrid Rice

基　　金：四川省水稻育种攻关项目(YZGG2014-1)

摘　　要：为探究蓉18A系列杂交水稻品种的氮肥利用特性,选用4个蓉18A所配代表性品种蓉18优188、蓉18优198、蓉18优662、蓉优908为材料,以Ⅱ优838、冈优725为对照,设置4个氮肥梯度处理,研究不同氮肥用量对产量及产量构成因素的影响。结果表明,在中氮(150 kg/hm2)和低氮(75 kg/hm2)水平下,蓉18A系列品种的稻谷产量和氮肥农学利用率均高于对照Ⅱ优838和冈优725,在高氮(225 kg/hm2)条件下稻谷产量和氮肥农学利用率均低于2个对照,具有明显的低氮高效特性;氮肥增产的主要原因是促进有效穗的增加。To understand the characteristics of nitrogen fertilizer utilization of the hybrid rice combinations derived from Rong 18A, four representative hybrids of Rong ISA, i. e. , Rong 18 You 188, Rong 18 You 198, Rong 18 You 662 and Rong 18 You 908, were selected to study the effects of the nitrogen rate on grain yield and its compo- nents under four levels of nitrogen fertilizer application, with 11 You 838 and Gangyou 725 as the control hybrids. The results showed that the hybrids of Rong 18A had a higher grain yield and a higher nitrogen agronomic efficiency （NAE） than the control hybrids, I1 You 838 and Gangyou 725, under the low-level （75 kg/hm2） and mid-level （ 150 kg/hm2） of nitrogen rates, while they had lower yield and NAE than the two controls under the high-level （225 kg/hm2） of nitrogen rates, which indicates the characteristic of low-nitrogen and high efficiency for the hy- brids derived from Rong 18A. It was found that the yield increase by nitrogen fertilizer application was mainly from the increase of effective panicles.

关 键 词：杂交水稻 蓉18A系列品种 氮肥利用率 产量 

分 类 号：S511.048[农业科学—作物学] S143