寒地水稲に対する時期別追肥窒素の利用率と各器官への分配

日本作物学会紀事

後藤 英次¹  稲津 脩¹  野村 美智子¹ 

[1] 北海道立上川農業試験場

关键词: Labeled nitrogen (15N);    重窒素;    Protein content;    タンパク質含有量;    Recovery rate;    窒素利用率;    Rice plant;    水稲;    Time of topdressing nitrogen;    追肥時期;   

DOI  :  10.1626/jcs.75.443

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

In order to understand the effect of the time of nitrogen topdressing (panicle formation stage — 40 days after heading time) on the recovery rate of applied nitrogen and its distribution in rice plant, we examined the absorption rate of nitrogen fertilizer (ammonium sulphate) labeled with nitrogen (15N) in Hokkaido Kamikawa Agric.Exp.Stn. (Brown lowland soil). Nitrogen topdressed from panicle formation stage to 7 days after panicle formation stage was allocated to polished rice at a low rate, and did not affect the protein content of polished rice, although it increased the yield. Nitrogen application at the flag leaf stage increased the recovery rate and protein content of polished rice. A similar tendency was observed irrespective of the amount of basal dressing of nitrogen. Both the recovery rate of nitrogen and protein content of polished rice were highest when the time of topdressing from heading time to 10 days after heading time.Therefore, it is important to apply nitrogen topdressing within 7 days after the panicle formation stage to produce low protein content rice, and later nitrogen topdressing should be avoided.

【 授权许可】

Unknown