Seeding Condition and Regulation for Seeding Rate of Paddy Rice by Direct Seeding on Well-Drained Paddy Field in Hokkaido.

Establishment of direct seeded paddy rice on well drained paddy field in Hokkaido in Japan shows low percentage because of low temperature. In this paper, we investigated about the relationship between some seeding conditions and percentage of seedling establishment. The most affectable factor to establishment of rice seedlings was seeding depth, below 3cm seeding depth gave lower percentage. Coated seed with calcium peroxide showed higher percentage, indicating effectiveness of that material on even if well drained paddy field. From those seeding conditions, we induced the multiple regression equation having 79% contribution ratio. Therefore, we discussedthis equation for actual adaptation and simulated for regulation of seeding rate.