Influences of simultaneous shot of fertilizer and seed and drainage of flooded water after seeding on seedling emergence and establishment and early growth of rice plants in submerged hill seeding.

摘要

The effect of shooting a slow-release fertilizer with the seed and draining after submerged direct seeding on the establishment of rice seedlings were investigated in pots and containers using a "shooting hill-seeder." In the pots (containers) seeded with fertilizer, the early growth of the aerial part and the subterranean part were slower than in the pots (containers) with fertilizer incorporated into the plowed layer. The soil with the fertilizer shot had a higher ammonium nitrogen content than the soil with fertilizer incorporated into the plowed layer. Seedling emergence and establishment were improved in the pots with the fertilizer shot that had been draining the flooded water after seeding of rice, and the early growth of the aerial part and the subterranean part were also promoted by the draining compared with that in flooded pots. These results suggest that the delay of the early growth by simultaneous shooting of fertilizer with seed was reduced by draining..