Land Use and Environntent on Upland Fields : The Case of Intensive System involving Crop Rotation in Hokkaido

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  • 畑地の土地利用と環境 : 北海道の一時的草地輪作を中心に
  • ハタチ ノ トチ リヨウ ト カンキョウ ホッカイドウ ノ イチジテキ ソウチ

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Abstract

The dominant land use in northern and eastern districts of Hokkaido is long-ley rotation-ploughing and cropping for one or four years and then grass for anything from four to ten years as in the western counties of Britain. The main condition for long-ley rotation is that, with the dampness of the climate, the better or more nutritious species of grass tend to die out after a few years. Gradually the grass-leys deteriorate and the better species of grasses are replaced by poorer. It is then time to plough again. Temporary grass-leys alternate with tillage crops (maize, root crops).Climate conditions favour long-ley rotation. But, it was not until 1955 that the system of long-ley rotation became widespread in Hokkaido, where the development of the system has been encouraged by the public authorities. This development may be explained by the stimulus of subsidy payments for ploughing up grassland. Over large areas of Hokkaido, where heavy clays prevail, hence costly for the farmer to drain and work, the development of long-ley rotation is based on the improved land (drainage, soil dressing, etc.).

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