Straw Returning Affects Soil Microbial Population and Wheat Crown Rot

doi:10.11924/j.issn.1000-6850.casb18070071

Abstract

Abstract: To explore the effect of straw returning on soil microbial population and wheat crown rot, the number of fungi, bacteria and actinomycetes in the rhizosphere soil under straw returning and non- returning was analyzed by dilution and separation method. The occurrence of wheat crown rot was investigated. The results showed that the number of bacteria, fungi and actinomycetes in wheat rhizosphere soil increased significantly after straw returning, and the occurrence of wheat crown rot was more serious than that of non-returning. After the straw was returned to the field, the incidence of wheat crown rot was higher than that in the non-returning area during the greening stage, jointing stage, booting stage, flowering stage and maturity stage, the incidence of wheat crown rot was 12.00%, 13.00%, 17.50%, 17.00% and 16.00% higher respectively, and the disease index of wheat crown rot was 3.38, 5.28, 7.37, 8.25 and 8.13 higher than that of the non-returning field, respectively. After the straw was returned to the field, the amount of microorganisms in the soil increased significantly compared with that in the non-returning soil, and the fungus increased most significantly. In the five growth stages of wheat, the growth of fungi in the soil was 591.32%, 373.63%, 212.62%, 285.74% and 373.95% higher than that of the non-returning field, respectively. Therefore, after the straw is returned to the field, the amount of soil microorganisms is increased, which aggravates the occurrence of wheat crow rot.

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