裸麦の収量および登熟生理に及ぼす穂肥窒素による後期重点施肥の影響

日本作物学会紀事

池尻 明彦¹  中司 祐典¹  鎌田 英一郎²  丹野 研一²  前岡 庸介¹  内山 亜希¹  金子 和彦¹  金岡 夏美²  高橋 肇²  荒木 英樹² 

[1] 山口県農林総合技術センター;山口大学農学部

关键词: Growth analysis;    成長解析;    Naked-barley;    裸麦;    Nitrogen fertilization;    窒素施肥;    Topdressing at spike formation stage;    ç©‚è‚¥;    Toyonokaze;    トヨノカゼ;    Yield;    収量;    Yield components;    収量構成要素;   

DOI  :  10.1626/jcs.83.1

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

We examined the effect of nitrogen (N) topdressing at the spike formation stage on yield and ripening physiology of the naked barley in Yamaguchi. N dressing was applied as basal dressing (4 or 6 g m-2) -topdressing at tillering stage (2 g m-2) -topdressing at spike formation stage (2,4 or 6 g m-2) in five combinations (4-2-2, 4-2-4, 4-2-6, 6-2-2 and 6-2-4 g m-2) with a total N of 8,10 or 12 g m-2 in two seasons, 2010/2011 and 2011/2012. Yield and its components, crop growth rate (CGR), spike and leaf area index (S & LAI), net assimilation rate (NAR), and N contents of grains, spikes, leaves and stems were measured. Grain yield, spike number and biomass production were the highest in the 4-2-6 g m-2 plot (total 12 g m-2 N) in both seasons. However, topdressing at a later stage did not have a positive effect on grain yield when total N was 10 g m-2, because the grain yields were lower in the 4-2-4 g m-2 plot than in the 6-2-2 g m-2 plot. CGR, S&LAI and NAR were also the highest in the 4-2-6 g m-2 plot. The N content of whole plant was already highest at the full heading stage in the 4-2-6 g m-2 plot, and the N uptakes during the grain filling period was also highest in the 4-2-6 g m-2 plot in both seasons. CGR in the early grain filling period was lower in the 4-2-4 and 6-2-2 g m-2 plots (total 10 g m-2 N) than in the 4-2-2 g m-2 plot, (total 8 g m-2 N) due to lower NAR.

【 授权许可】

Unknown