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延安南部原区有耕地120万亩(其中原地80万亩),人均5.5亩,海拔800—1200公尺,年平均气温8.5—9.5℃。地势平坦,土层深厚,土质较好,为黑垆土及黄盖垆,有利于农作物生长和机械化作业,生产潜力很大。但肥料不足,特别是有机肥料不足,使原区小麦、玉米产量受到很大限制。为解决这个问题,早在1958年就推广麦田套种草木樨绿肥,但水源缺乏,无灌溉条件,春旱、夏旱、秋旱时有出现,对草木樨捉苗、提高产草量和翻压都有一定风险。近几年,随着推广小麦良种、扩大机播面积和
There are 1.2 million mu of arable land in the southern part of Yan’an (800,000 mu in situ), with a per capita area of 5.5 mu and an elevation of 800-1200 meters. The annual average temperature is 8.5-9.5 ℃. Flat terrain, deep soil, soil is better, for the black soil and yellow capuchin, is conducive to crop growth and mechanization operations, production has great potential. However, insufficient fertilizers, especially insufficient organic fertilizers, have severely restricted the production of wheat and corn in the original area. In order to solve this problem, as early as 1958, wheat grass intercropping grass mulberry green manure was promoted. However, there was a lack of water and no irrigation conditions. Spring droughts, summer droughts and autumn droughts appeared. Pressure has a certain risk. In recent years, with the promotion of wheat varieties, expanding the area of machine-sowing