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The effects of 4 nitrogen levels on tuber yield, and on the total-N and nitrate-N content of plant samples taken during the early growing season were examined using the varietyKerr's Pink grown on nineteen sites. The mean yield of the zero N treatment was 38.7 tons/ha. Application of 45, 90 and 135 kg/ha increased yields by 4.5, 6.5 and 8.8 tons/ha… (More)