延安地区农村经济总收入中,农业收入占73%,而农业产值结构中,粮食又占78.8%,经济作物仅占12%,其它如绿肥、瓜菜占4.4%,桑果占4.5%,经济作物烤烟,花生、油菜以及瓜、菜、果主要是在塬区、川道条件较好的耕地上种植,而占耕地面积70%的坡耕地,几乎全是种植粮食作物,正常年份亩产50kg上下,亩产值15～20元,除去投资,每亩纯收入 7～15元,灾年亩产15～20kg,纯收入更低。坡耕地单纯生产粮食的过度耕作不仅收 In Yanan area, the total income of rural economy accounts for 73% of agricultural income. In agricultural output value structure, grain accounts for 78.8% and cash crops account for only 12%. Others such as green manure, melon dishes account for 4.4% and mulberry fruits account for 4.5% Crop flue-cured tobacco, peanuts, rapeseed, melon, vegetables and fruit are mainly planted on cultivated land with better conditions in Sichuan and Sichuan provinces, while cultivated land with a slope of 70% of cultivated land is almost entirely planted with grain crops. The output value per mu is 15-20 yuan. Excluding investment, the net income per mu is 7-15 yuan, and the annual output is 15-20 kg. The net income is even lower. Overexploitation of simple production of grain on sloping cultivated land not only closed