• ISSN 1008-505X
  • CN 11-3996/S
PAN Feng-bing, WANG Hai-yan, WANG Xiao-fang, CHEN Xue-sen, SHEN Xiang, YIN Cheng-miao, MAO Zhi-quan. Biological mechanism of vermicompost reducing the replant disease of Malus hupehensis Rehd. seedlings[J]. Journal of Plant Nutrition and Fertilizers, 2019, 25(6): 925-932. DOI: 10.11674/zwyf.18244
Citation: PAN Feng-bing, WANG Hai-yan, WANG Xiao-fang, CHEN Xue-sen, SHEN Xiang, YIN Cheng-miao, MAO Zhi-quan. Biological mechanism of vermicompost reducing the replant disease of Malus hupehensis Rehd. seedlings[J]. Journal of Plant Nutrition and Fertilizers, 2019, 25(6): 925-932. DOI: 10.11674/zwyf.18244

Biological mechanism of vermicompost reducing the replant disease of Malus hupehensis Rehd. seedlings

  • Objectives Increase of harmful fungi in soil is the main reason causing replanting related diseases. Effects of vermicompost in improving soil environment of apple replanted orchards were studied to prove an cost-effective biological way.
    Methods A pot experiment was conducted using Malus hupeheusis Rehd. as material. The tested soil was brown soil, collected from a 25-years-old apple orchard in Tai’an City. Four treatments were set as follows, the replanted orchard soil (CK), sterilized replanted orchard soil (TM), adding vermicompost in 20% of soil volume per pot (YF); adding sterilized vermicompost in 20% of soil volume (MYF). After one year’s growth, the biomass and root index of M. hupehensis Rehd. seedlings were measured, soil microorganisms and soil enzyme activities were determined.
    Results The plant biomass of M. hupehensis Rehd in the treatments YF and MYF was most significantly increased compared with CK, and plant dry weights were increased by 351.1% and 348.2%. The treatment YF had the best development of the morphology of fine root and the highest root respiration rate in all treatments, and the roots in YF treatment soil had the highest activities of SOD, POD and CAT. The number of bacteria and actinomycetes in YF soil were increased respectively by 107.8% and 97.7%, and the number of fungi was decreased by 17.1%, compared with CK. The result of q-PCR showed that the number of Fusarium oxysporum was decreased by 51.0% in YF and 57.6% in MYF. The activities of soil neutral phosphatase, urease, invertase and catalase were increased by 97.9%, 540.9%, 213.1% and 109.4% in turn in the YF treated soils.
    Conclusions The addition of vermicompost or sterilized vermicompost can improve the soil microbial environment of continuous cropping soil, improve the activities of soil enzyme, promote the growth of plant root, and increase the biomass of M. hupehensis Rehd seedlings as result. Therefore, vermicompost can reduce the harm caused by the apple replant disease, so it can be used as one of the effective measures to control apple replant disease.
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