抄録
The test crops and the test conditions of the rotary tiller were the same as those of part III.
The result was as follows;
(1) The field tilled after wheat has more stalks than the field tilled after paddy.
(2) When the size of the increment of cut was small, the performance of cutting and covering of stubbles was good. That was clear in the field after italian rye grass, and that was not clear so much in the field after wheat and rapeseed.
(3) The performance of cutting and covering of stubbles of 32 tines was better than that of 16 tines, in the same increment of cut of each crop.
(4) The performance of cutting and covering of stubbles in tilling depth of 10cm was better than in tilling depth of 5cm, in the same increment of cut.
(5) The performance of cutting and covering of stubbles in double tilling was a little better than that in one tilling, except rapeseed; and there was little difference between every test sections.
(6) Total remaining ratio in the fields after wheat and paddy was a little smaller than that in the field after italian rye grass and weedy paddy field.
(7) Tilling accuracy in uncovered field and the field after wheat and rapeseed was better than that in the fields after italian rye grass and weedy paddy field, The class of tilling accuracy of the former was more than B′ and those of the latter was C′-E′. The class of the smallest increment of cut [Hm 0.2], was more than A′, in every crop.
(8) When the tilling accuracy was better, the staying stubbles at tines were less, in the weeder for walking tractor.
