西南暖地の普通期水稲栽培における根系活力と登熟について

日本作物学会紀事

松元 里志¹  下田代 智英¹  五位塚 のぞみ¹  佐々木 修¹ 

[1] 鹿児島大学農学部

关键词: Bleeding rate;    出液速度;    Percentage of ripened grain;    登熟歩合;    Rice;    水稲;    Root system;    根系;    South west-warm region in Japan;    西南暖地;   

DOI  :  10.1626/jcs.78.465

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The objectives of this study are to investigate the bleeding rate of rice plants grow in a warmer region in south-west part of Japan during the growth period, and the relation between root activity and ripening were investigated. The bleeding rate of the rice plants (var. Hinohikari) grown under four different fertilizer application levels, were measured during the growth period in 3 years. The bleeding rate increased during the plant growth and reached a maximum value at 7 days before heading and decreased until the milk ripe stage. These results indicated that root activity of rice plants began to decrease before heading. The bleeding rate varied with the year and fertilizer application level, particularly with the year. The bleeding rate at the ripening stage did not significantly correlate to the yield of winnowed paddy, and increase in the dry matter and spike dry weight. However, the bleeding rate at 14 days after heading was significantly correlated with the percentage of ripened grain and the thousand grain weight. Thus, the bleeding rate could be used as an effective index in study on the effect of the activity of whole root system on ripening. The high root activity at milk ripe stage resulted in good ripening.

【 授权许可】

Unknown