Abstract
The application of green manure to soil improves soil health by increasing biological activity. However, little attention has been paid to the effects of different green manures on the microbiological community and soil function after incorporation. Here, it was found that the green manures of Vicia villosa (leguminous) and Brassica juncea (non-leguminous) have different fungal structures, despite the soil originally being the same. Moreover, some isolated strains showed plant-growth-promoting abilities. Three strains (H1: Penicillium spp., H2: Clonostachys spp., and H3: Trichoderma spp.) from leguminous-manure-incorporated soil and four strains (B1: Purpureocillium spp., B4: Taifanglania spp., B6: Trichoderma spp., and B10: Aspergillus spp.) from non-leguminous-manure-incorporated soil showed the potential for plant growth enhancement. Plant-growth-promoting traits revealed that four strains possessed phosphate solubilization and siderophore production, although none of them showed the ability to produce indole-3-acetic acid (IAA)-like compounds with/without tryptophan. In addition, higher extracellular enzyme activities—including endoglucanase and β-glucosidase activities—were also detected in the soil-incorporated green manures. In conclusion, this study suggests that different fungal structures appeared when different green manures were applied, which promoted plant growth. This indicates the potential benefits of promoting the incorporation of green manure into the soil.
Highlights
The use of mineral fertilizers in agriculture increases crop yields but decreases soil quality and microbial populations [1,2]
Isolation and Identification of Fungi of total fungal biomass was assessed based on the number of colonyforming unitsfungal (CFUs)
Our previous report showed different fungal communities between hairy-vetch- and B. juncea-incorporated soils using non-culturable methods [11], this study showed that different green manures—such as hairy vetch and B. juncea—resulted in different fungal isolation even from the same soil
Summary
The use of mineral fertilizers in agriculture increases crop yields but decreases soil quality and microbial populations [1,2]. A sustainable solution and new alternative technologies are being developed to replace mineral and slow-release fertilizers, in order to reduce environmental problems and improve crop productivity and soil health. The incorporation of green manure can affect soil microbial communities directly and indirectly, by providing the nutrients to the soil and plants, and leads to changes in the soil’s nutrient status [6,7]. The changes in soil microbial composition following green manure amendment can provide more enzymes that regulate nutrient fluxes, leading to the promotion of plant growth [10,11].
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