愛知県における水稲品種コシヒカリの外観品質低下要因及びその対策について

日本作物学会紀事

野々山 利博²  山下 和巳²  杉浦 和彦²  虎澤 明広²  山内 章¹  本庄 弘樹²  林 元樹² 

[1] 名古屋大学大学院生命農学研究科;愛知県農業総合試験場作物研究部

关键词: Base immature kernel;    基部未熟粒;    High temperature;    高温;    ‘Koshihikari’;    コシヒカリ;    Leaf nitrogen;    葉身窒素含量;    Mineralized nitrogen in soil;    土壌窒素発現量;    Nitrogen fertilizer;    施肥窒素量;    Nitrogen supply;    窒素供給量;   

DOI  :  10.1626/jcs.82.262

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The purpose of this study was to examine the factors deteriorating kernel quality of rice cultivar ‘Koshihikari’ cultivated in Aichi Prefecture. The investigation was executed in 68 fields in 2006−2009. The occurrence of base immature kernels was most prominent among white immature kernels at a high temperature. On the other hand, the occurrence of milky white kernels was less than that of base immature kernels, even in 2009 which was a year with low insolation during the ripening period. Therefore, the quality deterioration of ‘Koshihikari’ in Aichi Prefecture was considered due to the occurrence of base immature kernels. Since the occurrence of base immature kernels positively correlated with average temperature and sunshine durations during the 20 days period after heading, the kernel quality of rice is considered to be greatly influenced by climate. Base immature kernels negatively correlated with the leaf nitrogen content at full heading time, the content of the brown rice protein, and the amount of the nitrogen supply, including the mineralized nitrogen in soil. The amounts of nitrogen fertilizer in the fields were 1.47 g m-2 that was insufficient compared with the optimum amount of nitrogen fertilizer. Thus, the amount of nitrogen fertilizer was insufficient for Koshihikari cultivation in Aichi prefecture. We concluded that it is necessary to increase the amount of the nitrogen supply to control the occurrence of base immature kernels.

【 授权许可】

Unknown