Abstract
Abstract Greenhouse experiments using seedling pecan trees [Carya illinoensis (Wan-genh.) C. Koch] compared rates and repeated applications of K2SO4, K2SO4 vs. KNO3, and Ν adjuvants in combination with K2SO4 or KNO3. Leaf and stem Κ concentrations increased linearly with rates to 87.1 g/liter K2SO4 applied 5 times at 14-day intervals. Phytotoxicity was negligible to 10.9 g/liter K2SO4. Plants receiving individual applications of KNO3 or K2SO4 at 9.8 g K/liter 2 times at 14-day intervals had 92% and 53% more Κ than the control, respectively. KNO3 at 25.3 g/liter or K2SO4 at 21.8 g/liter, in combinations with urea and/or NH4NO3 at 6.25, 12.50, and 25.00 g/liter, increased leaf Κ concentration significantly and the increase was consistently greater using KNO3 than K2SO4. Both urea and NH4NO3 applied with either KNO3 or K2SO4 increased leaf Κ concentrations. Negligible phytotoxicity occurred when urea or NH4NO3 was applied at 6.25 g/liter with K2SO4 or KNO3.
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