WEI Saijin, HUANG Guoqiang, NI Guorong, LYU Weisheng, TAN Xueming, ZENG Yongjun, TU Guoquan, SHI Qinghua, PAN Xiaohua
To explore the effects of straw returning plus application straw decomposition agent on the rice soil microbial, a field experiment was conducted with treatments of single straw returning (CK) and straw returning plus straw decomposition agent (SM). Soil microbial diversity, mineral nutrient and crop yield were analyzed by routine approaches and Terminal-restriction fragment length polymorphism (T-RFLP). The results showed that compared with CK, the soil organic matter, total nitrogen, available phosphorus and grain yield under SM was increased by 15.0%, 31.0%, 98.0% and 5.9%, respectively. Bacteria, Actinomycetes and Moulds were increased by 14.66, 1.50 and 2.78 times higher than that of CK, respectively. In addition, nitritebacteria, nitrobacteria, denitrifyingbacteria, aerobic nitrogen-fixing bacteria, aerobic cellulose decomposing bacteria, inorganic phosphate bacteria, organic phosphorus bacteria, iron bacteria and silicate bacteria were improved by 119.8%, 55.6%, 51.9%, 40.5%, 107.4%, 70.8%, 145.2%, 140.1% and 70.0%, respectively. T-RFLP results showed that the bacterial abundance relating to the cycling of C and S, the anti-pathogen bacteria and other beneficial bacteria raised and phytopathogens bacteria declined in SM soil, and the diversity of microbial community structure was changed significantly. In conclusion, we concluded that straw returning plus straw decomposition agent had more improved for soil mineral nutrient, the soil microbial function diversity and crop yield than single straw returning. Thus this study provides a scientific basis for straw returning.