配施不同腐秆剂对还稻田麦秸腐解和水稻产量的影响

为阐明沿淮地区秸秆还田配施不同腐秆剂在秸秆腐解和水稻产量方面的差异,遴选出适合该区域使用的腐秆剂.本研究通过安徽省霍邱县的麦秆促腐还田定位试验,深入分析了秸秆还田和氮磷钾优化平衡施肥后不施腐秆剂(SF)、施腐秆剂1号(SFD1)、施腐秆剂2号(SFD2)和施腐秆剂3号(SFD3)等处理连续两年在秸秆腐解和水稻产量等方面...

Impact of Various SDMIs on Wheat Straw Decomposition and Rice Yield

To clarify the differences of straw decomposition and crop yield of different straw decomposing microorganism inoculum (SDMI) and reveal the mechanism of straw decomposition and rice yield regulated by SDMI in the paddy field along the Huai River. The study was conducted in a positioning test of straw to promote decomposition and return to field of Huoqiu County, Anhui Province. The experiment included four treatments: i) straw returning to field + fertilization + no application of SDMI (SF), ii) straw returning to field + fertilization + SDMI NO.1(SFD1), iii) straw returning to field + fertilization + SDMI NO.2(SFD2), and iv) straw returning to field + fertilization + SDMI NO.3 (SFD3). We found that: 1) There was no significant difference in total decomposition rate of straw among different treatments in two consecutive years, but significant difference in straw decomposition velocity in first year. Straw decomposition velocity increased by 70.59%, 262.5% and 93.33% in SFD2 compared to control, SFD1 and SFD3, respectively. 2) SFD2 had the highest rice yield in two consecutive years and it was significantly higher than those of other treatments (P < 0.05); Pearson correlation coefficients showed that the correlation between rice yield and straw decomposition velocity was the highest. 3) During experimental period, the influence of different treatments on soil microbial biomass was significant, and the decomposition velocity of returning straw was mainly determined by soil microbial biomass C/N. In conclusion, application of different SDMI would produce different effects of promoting decomposition and increasing rice yield. The combination of SDMI No.2 is the most beneficial to straw decomposing and crop increasing in the rice field along the Huai River. This may be because the SDMI No.2 can drive the soil to form a microbial community with high efficiency to degrade straw and accelerate the degradation of straw, thus alleviating the rice growth inhibition caused by delayed straw decomposing and finally achieving the yield increase.