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Journal of soil science and plant nutrition

On-line version ISSN 0718-9516

Abstract

LIU, Huai-a et al. Assessment of a new bio-organic remediation as a bio-fungicide in fusarium-infested soils of watermelon monoculture areas from China. J. Soil Sci. Plant Nutr. [online]. 2018, vol.18, n.3, pp.735-751. ISSN 0718-9516.  http://dx.doi.org/10.4067/S0718-95162018005002201.

Sustainably managed soils can increase soil quality, biodiversity, and reduce soil erosion and nutrient losses. In several regions of China, long-term monocultures such as watermelon are leading to severe degradation of soil biological functions due to contamination by dominant and deleterious microbes, particularly Fusarium spp., resulting in decreased soil productivity and quality.

The main goal of this study was to assess a new bio-organic fertilizer in monoculture areas by testing the interactions between Fusarium oxysporum f. sp. niveum and microbial communities to inhibit it. The results showed that the tested organism significantly reduced Fusarium wilt in a watermelon monoculture plantation in China. The rate of wilt incidence following bio-fertilizer treatment was decreased by 70% at 63 days and the Fusarium counts in the watermelon rhizosphere declined too. Moreover, total abundance of bacteria increased, but total abundance of actinomycetes decreased.

The beneficial microbes increased and became dominant while deleterious microbes, particularly Fusarium spp., were inhibited. The main conclusions of this study were that: i) a controlled bio-organic fertilizer stimulated the growth of ecologically beneficial microbes and naturally existing autochthonous antagonistic microbes; and, ii) the beneficial population structure and soil functions recovered following the reconstruction of functional microbial communities. Our results will add more useful information to understand how long-term crop monocultures can lead to detrimental effects on the soil microbial communities that will, in turn, affect the growth of plants and normal soil functions.

Keywords : Fusarium oxysporum f. sp. Niveum; bio-organic fertilizer; watermelon monoculture; biological soil contamination.

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