寒冷地北部において疎植栽培したあきたこまちの茎数過剰に伴う低収要因

日本作物学会紀事

松波 麻耶³  佐藤 雄幸²  松波 寿典⁴  金 和裕¹  三浦 恒子¹  能登屋 美咲⁵ 

[1] 秋田県農業試験場;秋田県農林水産部農林政策課;日本学術振興会特別研究員;農研機構東北農業研究センター;秋田県農業研修センター

关键词: あきたこまち;    収量;    疎植栽培;    一穂籾数;    水稲;    Akitakomachi;    Rice;    Sparse planting;    The number of spikelets per panicle;    Yield;   

DOI  :  10.1626/jcs.85.67

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

This study analyzed the yielding variation factor of sparsely planted rice cultivar “Akitakomachi” in Tohoku region, Japan. For four years (2010–2013), Akitakomachi was grown at densities of 15.1 hills m-2 and 11.2 hills m-2 with conventional cultivation. The grain yield in 2012 was lower than that in the other three years, in spite of the production of many panicles. In 2012, tillering was markedly stimulated, because of the high temperature and solar radiation after transplanting, and heavy precipitation during mid-summer drainage. On the other hand, the leaf color and plant height after the maximum tiller number stage in 2012 was comparably lower than in normal years. The number of spikelets per panicle was markedly decreased in 2012, resulting in 16–18% lower yield than in normal years under both sparse planting densities. There was a significant positive correlation between the spikelet number per panicle and the leaf color at meiotic phase, and the reduction of the spikelet number per panicle and the leaf color at meiotic phase, and the reduction in the number of spikelets per panicle was mainly due to the reduction in the number of spikelets at the secondary rachis-branch. These results suggest that maintaining moderate leaf color after maximum tiller number stage and prevention of decrease in the number of spikelets per panicle are important to achieve high yielding under sparse planting in a cool climate region.

【 授权许可】

Unknown