Summary and Conclusions
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1.
The source of nitrogen influenced the total yield of potato tubers, the nutrient concentrations in the potato petiole and the appearance of growing plants, especially in fields of low available phosphorus.
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2.
Urea resulted in higher nitrate-nitrogen, calcium, and magnesium concentrations in the plant petiole, but in lower phosphate-phosphorus concentrations as compared with ammonium sulfate.
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3.
Urea application in soils of neutral and alkaline reaction resulted in lower total yields than did ammonium sulfate at equal rates of nitrogen. In acid soils, urea appeared equal to ammonium sulfate.
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4.
Potatoes from urea-fertilized plants grown on soils of low available phosphurus exhibited symptoms of phosphorus deficiency during early season but outgrew these symptoms as the plants approached maturity.
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5.
Increasing the biuret content in the urea material from 0.2 to 1.3 per cent had no effect on yield or plant appearance.
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6.
In neutral and alkaline soils, ammonium sulfate was more efficient than urea as a nitrogen source for potatoes. In acid soils, indications were that urea equaled ammonium sulfate in efficiency for potatoes.
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Literature Cited
Lorenz, O. A., J. C. Bishop, B. J. Hoyle, M. P. Zobel, P. A. Minges, L. D. Doneen, and A. Ulrich. 1954. Potato fertilizer experiments in California. Calif. Agr. Exp. Sta. Bull. 744.
Olsen, S. R., C. V. Cole, W. R. Watanabe, and L. A. Dean. 1954. Estimation of available phosphorus in soils by extraction with sodium bicarbonate. U.S.D.A. Cir. 939. Wash., D.C.
Tyler, K. B., O. A. Lorenz, and F. H. Fullmer. 1961. Plant and soil analyses as guides in potato nutrition. Calif. Agr. Exp. Sta. Bull. 781.
Young, H. Y., and R. F. Gill. 1951. Determination of magnesium in plant tissue with thiazole yellow. Anal. Chem. 23: 751–754.
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Tyler, K.B., Lorenz, O.A., Takatori, F.H. et al. Urea nitrogen for potatoes. American Potato Journal 39, 89–99 (1962). https://doi.org/10.1007/BF02864800
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DOI: https://doi.org/10.1007/BF02864800