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Experiments were conducted on the effect of mulching of cutstraw and on the use of herbicides in rice stands to devise weed control methods suitable for the cultivation of wheat and by barley by seed broad-casting in rice stands (this method of cultivation enabled to save labour in providing a mulching effect as a substitute for the soil cover made of cut-straw by combine at harvesting time).(1) The larger the amount of cut-straw as mulling material, the more effective for the control of gramineous weeds. Emergence of wheat seedlings and their initial growth were inhibited when the amount of mulching material exceeds 90kg/a (dry weight basis) while the amount of less than 50kg/a was not effective in preventing weed growth, suggesting that the optimum amount ranged between 50 to 90kg/a.(2) The present experiments showed that mulching at the rate of more than 70kg/a was most effective when the amount of weed was little to moderate or in the case of weed control prior to broadcasting seed. In contrast, abundant to profuse weed proliferation under field conditions could not be readily controlled by cut-straw mulching.(3) The combined herbicides of benthiocarb and prometryne (granules) were proved to be effective at a dosage of 24+2.4g/a active ingredient (300g/a manufactured product) when applied immediately after field drainage within two weeks before seeding wheat.
日本雑草学会の論文