Abstract
The numbers of infectious propagules of indigenous vesicular-arbuscular mycorrhizal (VAM) fungi were determined at different stages of the rice-based cropping systems in two irrigated rice fields of varying strata and in a rainfed field. The most-probable-number method was used to estimate the infective VAM fungal population. On the irrigated farms the mycorrhizal inoculum was consistently less in the poorly drained low-lying field with a rice-rice cropping pattern than in the field in the better-drained upper stratum with a rice-corn-mung-bean pattern. The population of infective VAM fungi was generally low after the wet season rice crop when the field was inundated for a long period, increased during fallow in the presence of weeds, and was highest upon the maturity of the dry-season corn or rice crop. In the rainfed area the highest endophytic population was found at maturity of the mungbean crop and the lowest after land preparation prior to rice seeding.
Published Version
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