2002 Volume 64 Issue 5 Pages 134-141
We developed a hill Seeder for direct rice seeding, which is spreading over Akita prefecture, in well-drained paddy field. Its seed-feeding mechanism consists of a tangent cam with the many (or, four) points, a rotary valve and linkage that connects the cam and the valve. As the tangent cam is driven by a press wheel, the rotary valve is alternately opend and closed via the linkage. The rotary valve is composed of an inner and outer valve with different configurations of openings; it creates pulsation of seed flow for hill seeding. The performance of the machine was as follows: working velocity: 0.53m/s, hill space: 23.7cm, hill size: 7.8cm (longitudinal), 2.8cm (lateral). The yields of rice seeded by this seeder in well-drained paddy was 59.1kg/a, which was better than that by a common drill seeder in submerged paddy field.
