代かき程度が湛水直播した水稲の落水条件下における出芽と苗立ちに及ぼす影響

日本作物学会紀事

古畑 昌巳¹  福嶌 陽¹  楠田 宰¹ 

[1] 農業・生物系特定産業技術研究機構

关键词: Coleoptile;    鞘葉;    Drainage of flooded water;    落水;    Puddling;    代かき;    Rice;    水稲;    Seedling emergence;    出芽;    Seedling establishment;    苗立ち;    Submerged direct seeding;    湛水直播;    Wheat straw application;    麦稈施用;   

DOI  :  10.1626/jcs.74.9

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Effects of puddling in submerged direct rice seeding on seedling emergence and establishment after draining flooded water were investigated in pot experiments to establish the seeding method with a newly developed "Shooting hill-seeder". Draining flooded water after seeding rice seeds coated with calcium peroxide into puddled soil changed the three-phase ratio of soil and soil structure in the surface soil proportionally to the degree of puddling before seeding. In addition, water-holding capacity (air permeability) of soil in over-puddled pots was higher (lower) than that in normally puddled ones. Seedling establishment rates of rice seedlings at two weeks after seeding in over-puddled pots were lower than those in normally puddled pots, especially when seeded deep and wheat straw was applied. Furthermore, dry weights of shoots and roots of seedlings were affected by the degree of puddling. These results suggest that normal puddling (not over-puddling) improves both seedling emergence and establishment after draining flooded water following seeding of rice, especially when seeded deep and wheat straw was applied.

【 授权许可】

Unknown