粉碎和添加菌剂对红壤区自然堆沤条件下稻秆养分释放的影响

Abstract

Finding methodsto accelerate the straw decompositionprovides a scientific basis for straw utilization in red soil region. An experiement was conducted to compare the effects of straw treated with comminution and added stem rot agent on the nutrient releasing regularity of N,P and K. Four treatmentswere designed including in-site( CK),crushing,crushing +stem rot agent and crushing +farmyard manure. Each of five kg offresh rice straw was packed in 200 mesh nylon filter bag with a size of 60 cm×120 cm,then placed in the field conditions. The dry matter,moisture and N,P,K nutrient of straw were measured in 0,10,28,35,51,74 and 91 days. The results showed that crusting treatment increased the straw decomposition rate by 4. 2% compared with CK in 91 th day,and the N,P and K nutrient release accordingly increased by10. 4%,6. 8% and 12. 2%,respectively. Under crusting combined withstem rot agent treatment,the straw decomposition rate was increasedsignificantly by 6. 3% —7. 3%,and N,P and K nutrient release increased by 1. 0% —5. 8%,11. 6% —14. 9% and 2. 2% —5. 3%,respectively. However,P release was obviously inhibited in 20 days under crushing treatment,while crushing +microbes treatment did eliminated this inhabitationphenomenon. Rice straw treated with crushing combined with stem rot agent or farmyard manure could promote strawdecomposition and nutrient release,but the promotion effect is not significant when combined with non-specific stem rot agent.