“种几年苜蓿,收几年好庄稼”,这句农谚概括的说明了苜蓿对土壤改良的作用。菖蓿是一种多年生的豆科植物,它是牲畜的良好饲料,同时它有发达的根系能够改良土壤。我国栽培苜蓿的历史已有一千多年,到目前为止,在华北、东北与西北各省皆有苜蓿栽培,特别是西北各省栽种得尤为普遍。为了进一步研究苜蓿对土壤改良以及增产的效果,我们 “A few years of alfalfa, harvest years of good crops,” a phrase that outlined the role of alfalfa on soil improvement. Acipenser is a perennial legume that is a good feed for livestock and has well-developed roots that improve soil. The history of cultivation of alfalfa in our country has been more than one thousand years. So far, alfalfa cultivation has been carried out in all provinces of North China, Northeast China and Northwest China, especially in the provinces of Northwest China. In order to further study the effect of alfalfa on soil improvement and yield increase, we