Abstract: Yield-increasing effect and resistance against wheat cereal cyst nematode of M-14 composite biological fertilizer in field experiments were studied in this paper. The fields applied with substrate, conventional fertilizer and non-fertilizer were used as control groups. Statistics of root infection during over winter period, measurement of wheat basic characteristics in mature period, statistics of effective cyst number in harvest period soil and wheat yield determination data were adopted to analyze the advantage of applying M-14 composite biological fertilizer to wheat field. The results showed that not only wheat height, stem diameter, ear length, spike number per hectares and 1000-grain weight were effectively increased, but also infection rate and effective cyst number of the pest were significantly reduced with the application of M-14 compound microbial fertilizer at the level of 750 kg/hm². Under the amount, wheat yield was significantly increased by 14.3% compared to filed without any fertilizer (P<0.01). The reduction of effective cyst numbers was extremely significant from control groups, particularly compared to the non-fertilizer group with the data reduced by 97.59%. The experimental data also revealed that the disease occurrence was effectively prevented by the application of M-14 composite biological fertilizer through inducing incidence level and index. In conclusion, application of M-14 compound biological fertilizer could increase the resistance against wheat cyst nematode disease as well as improve wheat yield and lays theoretic foundation for the generalization and application of the composite biological fertilizer.

Key words: M-14 compound biological fertilizer, wheat cereal cyst nematode, infection rate