深水栽培による高品質米生産技術

日本作物学会紀事

寺尾 富夫²  千葉 雅大²  松村 修²  渡邊 肇¹  高橋 能彦¹ 

[1] 新潟大学大学院自然科学研究科;中央農業総合研究センター

关键词: Chalky grain;    白未熟粒;    Deep-flood irrigation;    深水栽培;    Deep planting;    深植;    Rice;    イネ;   

DOI  :  10.1626/jcs.80.312

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Suppression of the occurrence of chalky grains caused by a high temperature at the ripening stage of rice is an urgent issue in rice production in Japan. Deep flood irrigation with a water depth of 18 cm is an effective measure to avoid the occurrence. However, the area of paddy fields that can keep this level of water depth is limited, because the plants are usually not so high. Here, we examined the effects of flood irrigation at a water depth of 10 cm and deep planting (depth of 6 cm), and their combination on the yield and quality of rice using cultivars Hatsuboshi and Koshihikari which are sensitive and moderately tolerant to a high temperature at the ripening stage, respectively. In Hatsuboshi, deep planting combined with 10-cm irrigation from the rooting stage to the maximum tillering stage reduced the occurrence of chalky grains without yield reduction that was caused by an 18 cm flood irrigation. In Koshihikari, 18-cm flood irrigation was the best to reduce chalky grains, but 10-cm flood irrigation also reduced chalky grains significantly without significant yield reduction. Deep flood irrigation (18 cm) decreased the redox potential of soil, but did not damage the root system at the ripening stage. In addition deep flood irrigation did not reduce soil-bearing capacity, and was not considered to prevent combine harvesting.

【 授权许可】

Unknown