Abstract
1) In this experiment, a seed-shooting device including a saw-toothed disc was designed and developed as part of a new direct-sowing system for rice seed under submerged paddy field condition.
2) The saw-toothed disc is 190mm in diameter in size and 20mm in thickness, with 32 surrounding teeth. Elastic expanded-rubber is a suitable disc material.
3) The disc case consists of both supplying and shooting tubes, and the space between the disc case and the tip of the saw-toothed disc has to be adjusted within a width of 1 to 3mm.
4) The rate of revolution of the saw-toothed disc is automatically controlled in the velocity range of 100 to 1, 500rpm. Rice seeds are shot onto the soil surface of a paddy field in proportion to the velocity of the disc. The seed-shooting system applied in this experiment was well adaptable for use with soft soil immediately after puddling during land preparation.
5) Hill-seeding could be easily performed by the intermittent transference of several seeds using the supplying tube of the seed-shooting device.
