小麦根际联合固氮菌是一种新型的微生物增产剂,它具有固定空气中分子态氮、供给小麦氮素营养、产生生物活性物质、转化土壤缓效养分的特点和作用。1986年庆阳地区农科所从河北省科学院引进该菌剂,后由省科委立项开展应用试验研究,1991年项目通过省科委组织的鉴定验收。我所在本区几年的试验示范认为,菌剂有较强的适宜范围,特别是在中等或偏低肥力土壤施用效果较佳,其主要优点是:1.一般亩用0.5kg菌剂拌种,可使小麦增产11.5％以上;2.与氮磷化肥配合施用,更具较好的效益。既降低了化肥投入成本,又减少了环境污染,同时提高了土壤肥力,增加了小麦产量。亩用0.5kg拌种相当于4.4～8.7kg尿素的效果;亩用0.5kg菌 Nitrogen-fixing bacteria in rhizosphere of wheat is a new type of microorganism production-increasing agent, which has the characteristics and functions of immobilizing molecular nitrogen in the air, supplying nitrogen nutrition of wheat, producing bioactive substances and converting slow-acting nutrients into soil. In 1986, Qingyang Agricultural Science Institute introduced the fungicide from Hebei Academy of Sciences. Afterwards, the provincial Science and Technology Commission initiated the application of experimental research. In 1991, the project passed the appraisal and acceptance of the Provincial Science and Technology Commission. Experimental demonstration of my area a few years that the strong range of appropriate fungicide, especially in medium or low fertility soil application better, the main advantages are: 1. General mu with 0.5kg seed dressing , Can increase the yield of more than 11.5% of wheat; 2. With the application of nitrogen and phosphorus fertilizers, more good benefits. It not only reduces the input cost of chemical fertilizers, but also reduces the environmental pollution, increases the soil fertility and increases the wheat yield. Mu 0.5kg seed dressing equivalent to 4.4 ~ 8.7kg urea effect; mu with 0.5kg bacteria