Seedling Establishment of Direct Seeded Rice without Coating of Oxygen-generator on the Soil Surface in Flooded Paddy Fields(Genetic Resources and Evaluation)

Japanese Journal of Crop Science

Hirokazu SATO¹  Yuji MATSUE¹  Yosuke UCHIMURA¹ 

关键词: Direct seeding;    浮き苗;    Dissolved oxygen;    転び苗;    Emergence;    直播栽培;    Floating seedling;    出芽苗立ち;    Rice;    水温;    Turned down seedling;    水稲;    Varieties;    品種;    Water temperature;    溶存酸素濃度;   

DOI  :  10.1626/jcs.70.393

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

This study was conducted to clarify seedling establishment of direct seeded rice without coating of oxygen-generator, water temperture and dissolved oxygen conditions on the soil surface in flooded paddy fields [FPF] at northern Kyushu for development of low cost and labor saving production. The mean water temperature a day during 14 days after seeding ranged from 21.8 to 29.0°C. On the other hand, the mean diurnal dissolved oxygen content in flooded water ranged from 4.7 to 11.6 mgL-1 which were high enough for germination and rooting of rice seeds. Eemergence percentage in FPF varied from 0% to 89% among 72 varieties. There were 11 varieties with more than 80% of emergence percentage. Eight varieties of them had a ancestor 'Asahi'. The floating seedling rate + turned down seedling rate in FPF varied from 4% to 64% among 65 varieties of which had emergence percentage was 10% over. There was no significant correlation between emergence percentage and floating seedling rate + turned down seedling rate among the 11 rice varieties with high emergence percentage rate. Therefore, tere were rice cultivars that were superior in emergence of 80% over and floating seedling rate + turned down seedling rate of 10% less (i.e., Shinriki, Haenuki and Domannaka). High emergence percentage varieties had heavy grains, high bulk density of 1.1 over. Low floating seedling rate + turned down seedling rate varieties had high bulk density of 1.1 over and grown seminal root slowly. These results were helpful to select and breed varieties with good emergence and establishment in direct seeded rice without coating of oxygen-generator on the soil surface in flooded paddy field.

【 授权许可】

Unknown