Abstract
A bioassay was carried out to measure the mycorrhizal population levels in five soils disturbed by mining activities. Mycorrhizal infection of Medicago sativa (as test plant) was always less than 56%, and in some cases there was no mycorrhization. Thus degradation of soil by mining brings about a decrease in mycorrhizal inoculum potential. No relationship was found between the number of spores and either infectivity or soil characteristics.
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