Occurrence of vesicular arbuscular mycorrhizal fungi on crop plants under irrigation
1989
Al-Momany, A.A. (Jordan Univ., Amman (Jordan). Faculty of Agriculture)
Spores of vesicular arbuscular (VA) mycorrhizal fungi were found in all 100 soil samples collected from different parts of Jordan Valley. Their numbers differed widely from site to site and ranged from 18 to 418 spores per 100 g dry soil, and varied considerably for the same crop at different sites. In general there were more spores in soil planted to vegetables than in the case of those planted to fruit trees. Of the nine species found, Glomus pallidum, G. mosseae and G. faciculatum were the most common. The infectivity of the VA population in soil, assessed by measuring the severity and incidence of mycorrhizal colonization, did not correlate with spore numbers. More VA spore population and mycorrhizal development were found in low soil phosphorus content but no relationship to soil pH was found. Nine mycorrhizal species are reported under high pH values for the first time in Jordan
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