Effects of different crop straw on maize yield and soil fertility.

The different crop straws were returned to the soil to study the effects on maize yield and soil fertility.The results showed that the maize yields with maize and tobacco straw,rape and potato straw,and wheat straw treatments increased by 24.82% to 25.69%,18.40% to 19.44% and 8.33% compared with CK respectively.Different straws can increase soil organic matter,total nitrogen and alkaline hydrolysis nitrogen content and keep the balance between active P and active K in the soil.The tobacco straw has the strong ability to increase soil active K content,the maize straw is better to enhancing soil organic matter and N content,the rape straw has the strongest ability to increase N content,and potato and wheat straw has the lower ability to increase soil fertility.The crop straws increase maize yield by improving maize growing characters