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Three nutrient culture experiments were conducted to determine the responses of potatoes ( Solanum Tuberosum  L.) to various solution pH levels with NO 3 , NH 4 , and mixed NO 3 /NH 4  (1/1) at the same total N of 4 mM. The pH levels were maintained at 4, 5, 6, and 7 with NO 3  or NH 4 , and at 4, 4.5, 5, 6, 6.5, 7 with mixed N. In each of the experiments, Norland plants were grown for 28 days after transplanting. With mixed N, plant growth as total dry weight, leaf area and tuber number was essentially similar at pH 4.5 to 7, and decreased only at pH 4. However, with either NO 3  or NH 4  growth peaked at a particular pH level, pH 5 and 6 respectively, and was significantly reduced at other pH levels with severe stunting at pH 7. With mixed N, the concentrations of total N in shoots were similar at pH 4 to 7 whereas, with either N form, the concentrations of total N were higher at particular pH levels, pH 4 and 5 with NO 3  and pH 7 with NH 4 . The concentrations of P, S, Ca, Mg, and Mn in shoots were similar at pH 4 to 7 with mixed N, but varied at certain pH levels with either NO 3  or NH 4 . The results indicate that the useful pH range for nutrient uptake and plant growth is broader with mixed N than with either NO 3  or NH 4 .

BROADER pH RANGE FOR POTATOES WITH MIXED N THAN WITH EITHER NH4 OR NO3