Growth-promoting Effect Of Microbial Fertilizer On Corn And The Stress Resistance Of Strain G1

With the wide use of chemical fertilizer, its efficiency has been constantly reduced. Facts prove that relying on the increase of chemical fertilizer to increase production has its limits. The long-term use of chemical fertilizers will lead to some adverse consequences such as soil compaction, the decline of crop quality, environmental contamination and the irreversible changes of soil microbial flora. The use of the microbial fertilizers provides a good settlement to resolve those problems, which could raise the output of crop production and reduce the utilization of chemical fertilizer. It will not only reduce the production costs, but also improve the soil and crop quality, more importantly, reduce environmental pollution. Now, a variety of microbial fertilizer products has been appeared on the market, but the quality is unequal.In this thesis,23strains were separated from the microbial fertilizer products on the market,The experimental study of potted corn has been carried on the19strains in the light room and outdoor,and the research about resistance has also been carried on G1strains..The results of the research are as follows:1.Whether it is in the room light conditions or outdoor conditions, the strains grow better under the fertilizing amount of0.2g than1g. When the rate of fertilizer application is0.2g outdoor, the differences between B1, C1,D2, F2, and blank with fertilizer are obvious, and the differences between D3, E1, F1, G1, and blank with fertilizer reach a significant level.2. The soil nutrient analysis showed that the application of microbial fertilizers can reduce the rate of fertilizer application, in the case of the low level of chemical fertilizer (fertilizer application was0.2g), the amount of rapid available phosphorus in the pot with the strain A1, A3, D2D3, F2and J4was above300mg/kg, which was apparently higher than any other groups. In the case of the high level of chemical fertilizer application (1g), the amount of rapid available potassium in soil has a negative correlation with the plant height.3. It has been proved G1has strong acid resistance though the study of stress resistance about it. Natural formation of acid rain will not affect its growth and reproduction; the amount of surviving Gl bacteria at70℃is73%;When the salt concentration is3%,5%and7%, the surviving rate of G1bacteria is80%,64%and50%; Herbicide exceeding normal use will cause the biomass death; normal urea and pesticides will not have a great poisonous effect on the G1bacteria; Experiment results also showed that G1strains could help to protect new root of corns from the damage of harmful microbes and harmful gas in extreme high level of manure.In summary, the application of microbial fertilizers can reduce the amount of fertilizer and improve the nutrient content in soil, the G1in the extreme high-fat case has a protective effect on corn roots..Gl bacteria have acid resistance and salt, high temperature resistant properties, which determines the related conditions to produce and apply the microbial fertilizer containing the Gl.