Zinc and Sulfur Content in Pecan Leaflets as Affected by Application of Sulfur and Zinc to Calcareous Soils1

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Abstract Five rates of ZnSO 4 and 3 rates of S were applied in March 1966 in a single application to pecan trees ( Carya illinoensis (Wang) K. Koch) in a factorial experiment. A rate of ZnSO 4 in excess of about 20 kg/tree would be required to reach June 1966 leaflet Zn concentration in excess of the minimum optimum range of 60 ppm. No 1966 treatment resulted in leaflet Zn concentration in excess of 60 ppm in June 1967 or 1968. Significant Zn and S interaction was detected in September 1966 and 1967 leaflet Zn concentrations. There was a direct relationship between application rates of ZnSO 4 and S on leaflet Zn concentration in September 1966 and 1967.

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