陕北地区大部分属于高燥农业地带,主要的特点是:邱陵重叠,沟壑纵横,水土流失严重,气候变化异常,自然灾害繁多,农作物种类以谷子为主,占耕地面积20～25%,分布在各种类型的土地上,如水、旱、川、山、水漫地,以及比较瘠薄的山坡洼地和沙碱地上。例如延安专区1958年种植谷子84万亩,其中90%种植在山坡洼地,平均亩产251.1斤,单位面积产 The main characteristics of northern Shaanxi are high and dry agricultural areas. The main characteristics are: the overlap of hills and valleys, the ravines and ravines, the serious soil erosion, the abnormal climate change, the numerous natural disasters, and the main types of crops are millet, accounting for 20% to 25% Distributed in various types of land, such as water, drought, rivers, mountains, water and land, and more barren hillside depression and sandy soil. For example, the Yan’an area planted 84 mu of millet in 1958, of which 90% were planted in hillside depressions with an average yield of 251.1 kg per mu