关键词: 石灰, 麦草还田, 稻田土壤, 稻米, 安全性

Abstract:

With the continuous development of agricultural production levels, the yield of crop stalks has also increased, especially in areas where wheat and rice are rotated, where the annual output of wheat stalks and rice stalks is relatively large, reaching about 18 t per hectare. Siyang County began to promote the full return of straw to the field in 2006, and the total amount of straw returned to the field for 12 years has reached 216 t per hectare. In this study, the measures such as adding lime, gypsum, and biological inoculants were studied for the impact on the rice yield and safety and farmland soil. The results showed that the yield of each treatment increased by 3.41%~20.80% compared with the control （no lime, gypsum, biological inoculants, etc.）, and the heavy metal content of the soil and grain in each treatment did not exceed the standard.

Key words: lime, wheat straw return to the field, paddy soil, rice, safety