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在固原县土地瘠薄而又人少地多、农家肥奇缺的条件下,种植以苜蓿、草木樨为主的绿肥,实行粮草轮作,是改良土壤、提高土壤肥力的有效措施。我们从1976年开始,在黄铎堡公社农科站大面积种植在当地生长较好的草木樨和苜蓿,研究绿肥在改土培肥中的作用,取得了显著效果。黄铎堡公社农科站位于固原县三营川西部塬区,紧靠西沙梁,海拔1590米,年降雨量330～480毫米,年蒸发量1650～2300毫米,春旱尤重。1596亩耕地中80％为干旱地,只有20％的耕地能灌溉含盐0.6461～1％的苦水。土壤为沙淡黑垆土,土质瘠薄,有机质含量一般0.3～0.4％,较高的0.6
In Guyuan County, land is barren but less land and farmers lack of farmland, planted with alfalfa, grass mulberry-based green manure, the implementation of crop rotation, is to improve the soil and improve soil fertility effective measures. Since 1976, we have planted a large area of locally grown plants such as grass, mulberry and alfalfa on a large scale at the Agricultural Science and Technology Station of the Hutongbao Commune to study the role of green manure in soil improvement and fertilization, and achieved remarkable results. Huang Duobo commune Agricultural Station is located in Guyuan County San Ying Chuan western yuan highland, close to Xisha beam, elevation 1590 meters, the annual rainfall of 330 to 480 mm, the annual evaporation of 1650 ~ 2300 mm, particularly severe spring drought. 80% of the 1596 mu of arable land is arid land, and only 20% of arable land can irrigate the bitter water containing salt 0.6461 ~ 1%. The soil is pale sandy soil, soil infertility, organic matter content is generally 0.3 ~ 0.4%, higher 0.6