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延安南部旱原区,海拔800—1200公尺,年平均气温9—12℃,最高气温34—40℃,最低气温-17—-22℃;年降雨量500—620毫米,无霜期170天左右,气候温和,地势平坦,适宜种植小麦。但该地区旱、冻、病、虫、风、雹等自然灾害时有出现,尤其是土壤瘠薄和干旱,对小麦产量的提高影响很大,产量常徘徊在百斤左右。主产小麦的洛川县,从1949—82年小麦亩产超过百斤的仅有11年。为了尽快地改变这种状况,必须从瘠薄和干旱这两个薄弱
Yan’an southern arid area, elevation 800-1200 meters, the annual average temperature of 9-12 ℃, the highest temperature of 34-40 ℃, the lowest temperature of -17--22 ℃; annual rainfall of 500-620 mm, frost-free period of about 170 days, A mild climate, flat terrain, suitable for planting wheat. However, natural disasters such as drought, frost, disease, insect pests, winds and hail occurred in the region, especially soil infertility and infertility, which have a great impact on the improvement of wheat yield and the output often hovers around 100kg. The main wheat production in Luochuan County, from 1949 to 82 years, more than a kilogram of wheat per mu yield of only 11 years. In order to change this situation as soon as possible, weaknesses from both infertility and drought must be weak