一、前言武威市平川灌区在种植业中由于作物布局不合理,施肥上又重化肥轻有机肥,致使全区大部分土壤有机质含量逐年下降,土壤理化性质受到不同程度的影响,因而造成轮作倒茬困难,有机质肥源相对贫乏。为此,我们于1981～1983年在武威市农业综合科学实验点——羊下坝乡三沟大队农科队的绿洲灌耕土地上,以草木樨为纽带进行了三年三区 I. INTRODUCTION Due to the irrational crop layout in planting industry in Wuwei Pingchuan Irrigation District, heavy fertilizer and light organic fertilizer on fertilization led to the decline of soil organic matter content in most of the region and the different physical and chemical properties of soil, resulting in crop rotation Difficult, relatively poor organic fertilizer source. To this end, we in 1981-1983 in Wuwei City, agricultural comprehensive science experimental point - Yangxiaba Township Mizoguchi team of agricultural science team oasis irrigation land, grass mulberry tie for three years and three districts