为了观察引进的缘肥品种——湖北苕子和紫云英在毕节地区的适应性,摸索相应的栽培技术,为今后大面积推广提供依据,1963年冬在毕节头步桥公社基点上,选择了条件较好的新坝、水银两个生产队,采取三结合的方法,进行绿肥的引种观察示范试验。本地自然条件属于典型的丘陵地区。海拔1500多米。年平均温度13℃,最高温度35.8℃,最低温度-8.5℃。年降雨量950.2毫米,夏秋雨水多,6—8月平均在150毫米以上,冬春干旱,12—2月份平均在15毫米以下。无霜期短,约243天,一般初露在11月上旬,终霜在3月中旬。土壤以瘠薄的黄壤居多,约占总面积的60％以上。 In order to observe the introduction of the fate of fertilizers - Hubei Apricot and Astragalus adaptations in Bijie, to explore the corresponding cultivation techniques for the promotion of large-scale future to provide the basis for the winter of 1963 in the first basement Bijie Toubuqiao, choose The conditions of a good new dam, mercury two production teams, to take three combinations of methods for the introduction of green manure demonstration test. The local natural conditions are typical hilly areas. More than 1,500 meters above sea level. The annual average temperature of 13 ℃, the highest temperature of 35.8 ℃, the lowest temperature of -8.5 ℃. The annual rainfall of 950.2 mm, summer and autumn rainfall, 6-8 months on average more than 150 mm, winter and spring drought, 12-February average of 15 mm or less. Frost-free period is short, about 243 days, the general first exposed in early November, the final frost in mid-March. The soil is mostly barren yellow soil, accounting for more than 60% of the total area.