晩播きしたハダカムギの窒素施用法の違いが収量と品質に与える影響

日本作物学会紀事

辻田 泉¹  弓達 隆²  山口 憲一¹  木村 浩¹ 

[1] 愛媛県農林水産研究所農業研究部;愛媛県南予地方局産業振興課

关键词: Later sowing;    晩播き;    Naked barley;    ハダカムギ;    Nitrogen application;    窒素施肥;    Quality;    品質;    Yield;    収量;   

DOI  :  10.1626/jcs.83.105

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Although the optimal sowing time of naked barley (Hordeum vulgare var. nudum) is mid to late November in Ehime prefecture, it may not be sown whitin that period, depending on the climate and other growing conditions. In this experiment, the effects of nitrogen application on the yield and quality of naked barley sown about 30 days later than the optimal time were investigated. The yield in the later-sown plots was 28% lower than that in the optimal time-sown plot (average of 3 years), due to decreased number of panicles. However, in the plots where the total amount of nitrogen application was increased to 14∼16 g m-2, decrease in the number of panicles due to later sowing was prevented, and the decrease in yield was only 23%. In later sowing, the number of late emerging panicles due to topdressing at the panicle formation stage, resulting in the deterioration of grain quality (immature grain rate and steely-grain rate was increased and pearled grain whiteness decreased). In order to obtain a higher yield and to prevent deterioration of quality in later sowing, a nitrogen fertilizer should be applied to promote initial growth, and to secure the number of panicles. The suitable nitrogen application rate is 9 g m-2 for basal dressing, 2 g m-2 for topdressing at the tiller formation stage is, and 3 g m-2 for topdressing at the panicle formation stage is.

【 授权许可】

Unknown