Vesicular-Arbuscular Mycorrhizal Infection in Combined Tillage and Fertilizer Treatments
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Vesicular-arbuscular mycorrhizal (VAM) fungi are obligate symbionts that exist in the rhizosphere of the plant community. In an agroecosystem the combined effects of fertilizer and tillage treatments on the mycorrhizal status of the two dominant weeds, Chenopodium album and Setaria glauca. were examined. Degree of infection was recorded over two harvest periods in one growing season. Mycorrhizal infection occurred in both species but the degree of infection was lower in Chenopodium album. No effect from tillage or fertilizer was exhibited in the first harvest period in either species. Highly significant effects of fertilizer treatment upon mycorrhizal infection for both species occurred in the second harvest period. There also were significant effects from tillage in Setaria glauca. For all plants, the highest percent of infection was exhibited in the treatment with the absence of both tillage and fertilizer. Differences in management practices did affect the mycorrhizal status of plants.