Soil pH is Important for Zinc Absorption

Most pecan trees in the southwestern U.S. grow in alkaline soils. Improved pecans absorb little or no zinc from alkaline soils. The abundant zinc in the soil is not soluble in soil water and, therefore, not available to the tree.

Native pecans appear to partially satisfy zinc needs from leaf litter and natural flora on undisturbed soils. Soil applications of zinc are of no significant value to pecan trees in alkaline soils in the western United States. Foliar applications of zinc allow uptake to occur via young leaves. Pecan trees growing in acid soils, as in the southeastern U.S., may require less or even no zinc amendments.

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