Threshiug Test of the Wet Paddy

Abstract

The author carried out the threshing test of wet paddy of 21-25% moisture content, by a self-feeding thresher and power thresher, with the research of paddy quality and the performance of separation.
Results obtained are as follows.
1) Even if paddy is very wet, the cracked and broken rice is hardly found in threshed paddy, unless the revolution of threshing cylinder is extremely high.
2) Rice husked in threshing increased in accordance with the increase of revolution of threshing cylinder. Adequate speed of effective circumferential threshing cylinder is 500-550m/min, to prevent rice husked in threshing. But when the revolution of the cylinder is constant, wet paddy does not become husked than dry paddy.
3) The lusters of husked rice are not different between two treatments; paddy is threshed before it is dried or not.
4) Separation performance in wet paddy threshing is not always so worse than in dried paddy. In this test it can be said that the power thresher has better separation performance than the self-feeding thresher.
5) To save the labour and raise up the efficiency in rice harvesting, it is necessary to develop the small combine suitable for Japanese farmers which can perform reaping and threshing at the same time.