晋西麦田约占耕地面积的20％左右,大部分是山坡地,6月底收割,9月中、下旬播种,一年一熟,休闲期正值降雨集中、产生水土流失的七、八、九三个月。根据我所试验场的降雨量和作物产量资料统计分析:在年降雨量平均500毫米的情况下,每亩施农家肥4000～5000斤,各种作物多年平均亩产量可达500斤左右,每降1毫米雨可生产1斤粮食。在大旱的1965年,降雨量为231.9 Shanxi wheat fields account for about 20% of the cultivated area, most of them are hillsides, and are harvested by the end of June. In mid-September and late seeding, crops are cooked in the same year. During the leisure time, rainfall is concentrated, resulting in soil erosion of seven, eight, nine Three months. According to the data of rainfall and crop yield in our test site, the statistical analysis shows that in the case of an average annual rainfall of 500 mm, farmers apply 4000-5000 jin of fertilizer per mu and the average mu yield of various crops can reach about 500 jin per year Drop 1 mm rain can produce 1 kg of food. In the drought of 1965, the rainfall was 231.9