In this study we evaluated the effects of different rates of bio-organic fertilizer (BOF) in soil with different organic matter content on Verticillium dahliae,disease index,dry matter weight of plant,soil microbes and microbial biomass. The results showed that the dry matter weight of plant and soil microbial biomass were increased with amount in-crease of fertilization in soil with the different organic matter content,while the number of soil microorganisms increased first and then decreased. The result was the highest in the high organic matter content of soil with application of bio-organic fertilizer 10~20 g/kg and both in medium and low organic matter content of soil with application of bio-organic fertilizer 20 ~ 30 g/kg. Application of bio-organic fertilizer could significantly reduce the disease index of cotton Verticillium Wilt,and control effect was between 21.7%~75.0%. The control effect was the highest (52.6 % ) in the high organic matter content of soil with application of bio-organic fertilizer 20 g/kg,and the best (75.0% ,55.0% ) both in medium and low organic matter content of soil with application of bio-organic fertilizer 30 g/kg. In short,the scientific and rational fertilization not only is good for the microbial flora to a healthy and reasonable direction,but also minimizes the disease of cotton,and provide good protection for cotton growth.%通过盆栽试验,研究了不同有机质含量的土壤中施用不同用量生物有机肥对棉花黄萎病的发病率和病情指数、植株干重、土壤微生物数量及微生物量的影响.结果表明:随着施用量的增加,不同有机质含量的植株干重和土壤微生物量也在的增加,而土壤微生物数量则呈现先上升后下降的趋势.其中高有机质含量的土壤中施用10 ～ 20 g/kg生物有机肥处理最大,中、低有机质含量的土壤中施用20～30 g/kg最高.施用生物有机肥能显著降低棉花黄萎病病情指数,且防治效果在21.7％～75.0％之间.其中高有机质含量的土壤施用20 g/kg防病效果最高,为52.6％;中、低有机质含量的土壤施用30 g/kg效果最高,分别为75.0％、55.0％.总之,科学合理的施肥,不仅能够更好地使土壤微生物区系向健康、合理的方向发展,而且最大程度上降低棉花病情,为棉花生长提供良好的保障.
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