The Control And Field Effects Of Multifunctional Bacterial Agent Against The Soil-borne Diseases In Winter Wheat

Under"wheat-maize"rotation system in North of China, maize straw incorporation had been widely used. However , the increasing trend of wheat soil-borne diseases tend to more and more severe in recent years; in addition, it also led to some other farming problems. The aims of the study is taking full advantage of the collaborative relations of a wide range of micro-organisms, the beneficial microorganisms were screened in the lab and made into soil amendment, which have both antagonistic effect on the soil-borne pathogens and a stronger adaptability and ability to break down the corn stalks. After applying the Soil Additive into corn block straw soil, the microorganisms decompose rapidly and at the same time became the dominant microorganisms by making use of the nutrients produced by decomposition of corn stalk to inhibit the growth of Wheat soil-borne disease pathogens. So, to some extent preventing and controlling the soil-borne diseases of wheat.Soil-borne diseases of wheat have been getting more and more serious in the winter wheat/maize rotation growing system in northern China. A multifunctional microorganism strain B1514 (Bacillus subtilis) has been found to have inhibition effect against major pathogens of winter wheat soil-borne diseases, and decomposition ability to maize straw, and have the ability to utilize the straw for multiplication. The strain was processed into bacterial reagent HAD-1. Field experiments were made from 2008 to 2010 to test the effect of HAD-1 on soil physical and chemical properties and microbial populations ,HAD-1 for the control effect to the major wheat soil-borne diseases, the composing ability to maize straw, and the reproductive capacity. And determine the best dosage of HAD-1. And 2010 to 2011, the best application rate through the soil application of different doses in different multifunctional agents HAD-1, HAD-1 is not used to the control, mixed inoculation of pathogens, we determined the amount of HAD-1 of wheat soil-borne disease control effects, and Detection of strain B1514 in the field and appreciation of different treatments was select.Results showed that HAD-1 of the application increased soil bulk density of wheat, and the soil temperature, decrease humidity; to reduce soil organic matter content, and improve the situation of N, P, K and other nutrients;.HAD-1 had significant control effect to wheat sharp eyespot, take all and root gave disease. The control efficacy at wheat jointing stage was separately 59.63% to 72.59%, 57.64% to 59.29% and 54.48% to 63.25%, respectivity the yield loss decreased 8.67% to 11.70%, increase the population numbers of B1514 2.68×10~7-4.83×10~7 times during wheat growing season. HAD-1 significantly accelerated the decomposition of maize straw in the soil. The decomposition rate increased by 18.7% to 24.3% during wheat growing season,and HAD-1 of the optimal application rate the field is 8 Kg/667m2.