Inoculation experiments were carried out in wheat astragalus mixed cropping system to study the changes of plant biomass, nitrogen content in plants and soil, and enzyme activity of Rhizobium .

• 采用盆钵实验；在小麦与紫云英混作系统中；通过对紫云英接种根瘤菌；研究了小麦与紫云英生长过程中植株生长、植株生物量、植株与土壤氮素变化情况及根瘤菌的酶活性.