Studies on the Underground Sowing Machines in the Paddy Field (3)

Construction of seed planting devices

Abstract

Seed-planting devices were pre-produced. These were for the direct underground sowing in the paddy field. The transportation of coated seeds were done by air flow through seed conductor tubes. Two types of devices were tested in the laboratory and in the field. Following results were obtained.
1. Sledge type seed planting device.
1) Desirable length and width were about 300mm and 100mm respectively.
2) For the shape of furrow opener, the rectangular type was preferable.
3) The size of air exhaust port should be large enough to make air-flow well.
4) The depth of soil covering plate should be 1.3 to 1.5 times of the depth of furrow opener.
5) The pressure to sledge should be heavy enough to make ditch by shoe.
2. Levelling and marker-supporting-pipe-type seeding device. This type of the device can assure the stable seeding depth, even the puddling and leveling were not so fine and smooth.