:II. The Kinds of Succeeding Crops and the Ridging Method
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概要
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This study was conducted to investigate how the emergence of perennial weeds changed, when the different kind of succeeding crops, that is, soybean, buckwheat and Italian ryegrass, were planted at the proper timer espectively, and moreover when the ridging method for the soybean cropping on drained paddy field was changed.The results obtained can be summarized as follows:(1) In the first cropping season of paddy rice, 1979, emergence of Scirpus juncoides Roxb. sp. and Cyperus serotinus Rottb. were decreased in each cultivated plot on drained paddy field as compared with the non-cultivated plot. Decrease in the emergence of Scirpus juncoides Roxb. sp. was larger in the early cultivated plot than the late cultivated plot.(2) As a result of planting the succeeding crops on the stubbled field after the harvest of early season paddy rice, the emergence of perennial weeds in the paddy field was different from the kind of succeding crops.Such difference as above mentioned was similar to that in case of the time of cultivation which had been reported in the previous report.(3) It was recognized that the emergence of Cyperus serotinus Rottb. and Eleocharis acicularis Roem. was decreased in the field which was planted with succeeding crops as compared with the field which was only cultivated without croppings.It was considered that the formation of the multiplication organs was decreased by the reduction in the solar radiation under succeeding crop canopy, and by the inhibition of the regeneration of weeds due to weeding on the border around the paddy field.(4) For the influence of different ridging methods in the soybean cultivation, emergence of Cyperus sertionus Rottb. decreased in the high ridge plot as compared with that in the level row plot, and emergence of Sagittaria pygmaea Miq. decreased together.It was considered that the content of soil moisture was lower in the high ridged plot than that in the level row plot, so that the previous tubers were perished and at the same time the formation of new tubers was inhibited.(5) In the early season rice culture, these kind of succeeding crops after the harvest of paddy rice and the ridging methods for these crops influenced remarkably the change in the perennial weed community.In order to conduct the weed control effectively, such methods as above mentioned should be applied on the systematic weed control.
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