米脂县印斗公社吴家峁大队,处于乌龙河和无定河的分水岭上,面积约三点四平方公里,有三十五个山峁和八条支毛沟,是典型的黄土丘陵沟壑区。合作化前,两千八百多亩农耕地,全部在山梁陡(土爪)上,沟底没有一点平台地,山高、坡陡、沟深、沟窄,十年九旱,遇上暴雨水土流失严重。合作化以后,特别是一九五八年公社化以后,在党的领导下,开展了大规模的水土保持工作。六年多 Mizhi County Printing Machine Co., Ltd. Wu Jialiu brigade, in Wulong River and Wudinghe watershed, an area of ​​about 3.4 square kilometers, with 35 shan and eight branch furrows, is a typical loess hill gully area . Before the cooperation, a total of 2,800 mu of arable land were all steep on the ridge of the mountain (soil claws). There was no platform at the bottom of the ditch. The height of the ditch was steep, Serious loss. After the co-operation, especially after the communalization in 1958, under the leadership of the party, a large-scale water and soil conservation work was carried out. More than six years