抄録
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 the farm work system of wheat, the most important crop there.
1) In the process of autumu land preparation, farmers repeat plowing and harrowing 3 times for trapping and holding rain-water in soil, and expend large amount of labor force for transporting of organic fertilizer which was made from the mixture of donkeys' dung and soil.
2) In the process of seeding, farmers sow seeds with wooden drill under the conditions of no tillage, no fertilizing deep seeding and high sowing density.
3) In the process of crop rearing, farmers work only for weeding, but it is very labor expendable work.
4) In the process of harvesting, farmers cut wheat with scikle and bind it into bundle, then they store it in large heap for halt a year. In winter, farmers thresh it with stone made roller drawn by donkeys.
5) Labor requirments of total and each process are nearly equal to Japanse one in pre-mechanized age.
6) In busy season, farmers need the aid of children and old folks.
