In order to evaluate the effect of soil improvement by planting asparagus on soil in cold and sandy area,a field experiment was carried out in Youyu, Shuozhou, Shanxi Province. Four different planting year treatments ofAsparagus as 1 st, 2 nd, 3 rd, and 4 th year since planting were set up and naked sandy soil before planting was used asthe CK. Soil physical and chemical properties and Asparagus growth indexes were determined. Results were as follow:compared with CK, with the increase of planting years, soil clay and silt content increased, sand content decreased,soil bulk density decreased, soil water holding capacity increased. The values of pH and EC in soil decreased, organicmatter, total nitrogen, available phosphorus and available potassium content increased. In the 4 th year of plantingAsparagus, compared with CK, four aspects changed significantly:(1) soil clay content increased to 29.8%, powdersand content increased to 12.6%, and the sand content reduced to 57.6%, bulk density reduced, water holding capacityincreased, and soil transformed from loam type to clay type;(2) the pH of soil decreased by 0.75 units and the ECdecreased by 0.08 mS/cm;(3) soil organic matter content increased by 28.89%, total nitrogen content increasedby 95.12%, available phosphorus content increased by 94.92%, available potassium content increased by 45.40%,soil fertility was significantly enhanced;(4) production of Asparagus reached 6 037.5 kg/hm2 under this condition.Therefore, cultivation of Asparagus for 4 years continuously can improve the physical structure of soil, improve soilnutrients, reduce the degree of salinity, and can be used as one of the pioneer crops to improvement soil condition incold desertification area, and achieve ecological benefits and economic benefits simultaneously.
Cold desertification area