Tank mixing Uran (0.5% by weight) with ZnSO 4 increased leaflet Zn concentration compared to ZnSO 4 alone in pecan [ Carya illinoensis (Wang) K. Koch]. Zinc nitrate was more efficient than ZnSO 4 in increasing leaflet Zn concentration especially if tank mixed with Uran (0.5%). Zn concentration of spray solutions can be reduced by 1/8 to ¼ of the current recommended rate of Zn at 86 g/100 liters of water as ZnSO 4 . Use of the lowest rate of Zn(NO 3 ) 2 , 10.8 g/100 liters of water + Uran, increased yield and income over the recommended rate of ZnSO 4 .
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Smith et al. (1979) studied this question.
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