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Soil microbial community dynamics during ryegrass green manuring and brassica biofumigation
This study compared how a winter-grown ryegrass green manure (Lolium multiflorum, var. Tetila) and brassica biofumigant (Brassica juncea, var. Caliente 199) affected the bacterial, fungal and non-fungal eukaryote communities of an intensively cropped temperate vegetable production soil. The aim was to determine the timing, magnitude and duration of ryegrass green manuring and brassica biofumigation's effects on the microbial community dynamics of the bulk soil. We analysed the soil microbial communities with high throughput amplicon sequencing of soil DNA extracts at key times within one growing season, focussing on the period around incorporation, to determine how the communities changed in response to the treatments.
Ryegrass and biofumigant green manure crops both had significant effects on the soil microbial ecosystem, and the fungal and non-fungal eukaryote communities were more responsive than the bacteria. Community change in the biofumigant and ryegrass treated plots was greatest in the weeks immediately after incorporation and slowly receded with time. However, the fungal and non-fungal eukaryote communities of all treatments remained significantly different to each other at the end of the experiment 35 weeks post-incorporation. We also found that soil pH was variable across the site and strongly related to differences in bacterial, fungal and eukaryote community structure.
Horticulture Innovation Australia
Publication titleApplied Soil Ecology
Department/SchoolTasmanian Institute of Agriculture (TIA)
PublisherElsevier Science Bv
Place of publicationPo Box 211, Amsterdam, Netherlands, 1000 Ae
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