Abstract: 【Objective】 The objective of this study is to evaluate the effects of bioorganic fertilizers with compound microbes (Brevibacillus brevis, Paecilomyces lilacinus, Acremonium implicatum, Trichoderma hamatum) on cucumber growth, yield and the control efficiency against root-knot nematode disease, then screen the efficient combinations of microbes.【Method】Experiments included 10 treatments of bioorganic fertilizers with compound microbes (No.1 to 10), which were from different compounds of the four kinds of microbes B. brevis, P. lilacinus, A. implicatum, and T. hamatum, the bioorganic fertilizers and the 10% fosthiazate granules were as the fertilizer and chemical control, respectively, the treatment without any fertilizer and pesticide was as the negative control. Based on the experiments performed in greenhouse and field, the differences of 10 treatments were analyzed by measuring the root-knot nematode disease index, cucumber yield, plant height and shoot fresh weight, and then the effects of bioorganic fertilizers with compound microbes on cucumber production and control efficiency of root-knot nematode disease were evaluated【Result】In pot experiments, the control efficiency of fosthiazate treatment was up to 89.2%, which was significantly higher than other treatments and controls. Among the 10 treatments of bioorganic fertilizers with compound microbes (No.1 to 10), the control efficiency of root-knot nematode of No. 5, No. 6, No. 9 treatments were 52.5%, 52.5%, and 54.2%, respectively, and the control efficiency of these treatments were higher than other fertilizer treatments. In the greenhouse plot, there was no significant difference in control efficiency among No. 5 (56.8%), No. 6 (57.6%), No. 9 treatments (59.3%) and fosthiazate treatment (61.3%). In addition, there was a significant positive correlation in the root-knot nematodes control efficiency between pot experiments and greenhouse plot, and the control efficiency of multi-microorganisms were better than that of single microorganism usually. Compared with the negative control, all fertilizer treatments increased cucumber growth and yield significantly (p＜0.01), but there were some difference among bioorganic fertilizers with compound microbes (No.1 to 10). In field trials, the yield increase was in the range of 31.7%-74.9%, the best treatment was No. 6, and the increased range of which was 74.9%. In pot experiment and greenhouse plot, compared with the negative control, the control efficiency of No. 9 ranked the best in yield, and the increased range was 60.4% and 68.1%, followed by No. 9 treatment, the control efficiency of No.1 were 50.8% and 55.8%, respectively. No. 5, No. 6 and No. 9 treatments could not only control the root-knot nematode disease effectively, but also promoted cucumber growth and increased their production, among them No. 9 treatment was the most effective treatment. There was a correlation in control efficiency of root-knot nematode and production increasing between pot experiment and greenhouse plot, but the correlation level was low. 【Conclusion】The bioorganic fertilizers with multi-microorganisms (No. 5, No. 6 and No. 9) have better effects on cucumber growth, yield and the control efficiency of root-knot nematode disease, thus possessing an important utilization value and research potential in agriculture production.

Key words: bioorganic fertilizers with compound microbes, cucumber, root-knot nematode, control effect, increase production