| Dingxi City Lee Town is a typical dry farming area in the Loess Plateau. In this area, agricultural production usually uses a planting method, named whole film double furrow sowing. In this research, to investigate the dynamic characteristics of soil nutrients and soil microbial biomass during the process of decomposing wheat and corn straw for 120 d, a pot cultivation method, simulating the actual planted production in this area, was employed by adding different kinds of straws. The results showed that after 120 days of decomposition, the increasing rates of soil organic matter and nitrogen with each treatment tended to increase in the early time, and then became decreased. The rates of soil phosphorus and potassium appeared an increase-decrease-increase-decrease trend. Fields with straw return by adding decomposition accelerators could improve the increasing rates of soil nutrients. The soil nutrients using different straws with the decomposition accelerator F3 (including Bacillus, filamentous fungi, actinomycetes and yeasts with special features) were higher than those with other treatments. The soil nutrients using different straw treatments with the same decomposition accelerator performance in an order of the following: WF1>CF1, WF2≥CF2, and WF3 |