Abstract
The authors made the survey of usual farm works for improving the cropping system as a part of the researches on the greenification of the loess plateau in China.In this paper, we described social and natural conditions of the loess plateau and agricultural indices of the surveyed district, and then the results of the survey which was carried out on the sequence of crops at one village.It was estimated that there were two kinds of crop-rotations. One was 4 years rotation, i.e. pes→wheat→millet or flax (edible oil), and another was 5 years rotation, i.e. pea→wheat→wheat→wheat→millet or flax (edible oil).Specific characters of estimated sequence of crops were discussed from the view points of trapping and holding rain-water in soil, fertility of soil, securing of food and edible oil, and seasonal dispersion of labor force.
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