EFFECT OF IRRIGATION, WATER SALINITY AND ROOTSTOCK ON THE VERTICAL DISTRIBUTION OF VESICULAR-ARBUSCULAR MYCORRHIZA IN CITRUS ROOTS.

The effects of rootstock, irrigation regime and water salinity on the vertical distribution of vesicular-arbuscular mycorrhiza (VAM) of citrus roots were investigated in the field. Rootstocks differed in the uniformity of the vertical distribution of VAM, notably, Rough lemon exhibited a uniform vertical distribution and Sour orange a non-uniform distribution with decreased VAM infection at depth. Decreasing the interval between irrigations reduced VAM infection of Sour orange, especially in the upper layers of soil. Increased salinity of irrigation-water reduced VAM in deep layers of soil. [ABSTRACT FROM AUTHOR]