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Published online 1 July 1972
Published in Agron J 64:506-508 (1972)
© 1972 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Influence of Nitrogen Source and Rate on Growth of Spring Grain and Soil pH1

J. Alessi and J. F. Powers2

The effect of five N sources upon spring grain production was studied on Temvik silt loam for 4 years at Mandan, N. Dak., and residual responses were followed for 4 more years. The five sources—ammonium nitrate, ammonium sulfate, calcium nitrate, Uramite, and Nitroform (urea-formaldehyde)—were applied at rates of O, 34, and 68 kg N/ha to spring wheat (Triticum aestivum) or barley (Hordeum vulgare L.). Results suggest that neither the rates of fertilization studied nor the interaction of N carrier x N rate were important in the production of total plant dry weight or grain yield. Small grain production was significantly altered by N source in only one of the fertilization years. Cumulative grain yields for 1960-1963 were significantly increased by fertilization with nitrate and ammonium sources. Grain yields for the 8-year period were significantly higher for ammonium and nitrate sources than for urea-formaldehyde sources. Residual effects from urea-formaldehyde fertilization were less effective for grain production than residual effects from nitrate and ammonium N carriers. Although ammonium sulphate lowered pH during the fertilization period, grain development was not seriously affected by this acidification. Cumulative grain production for the 8 years was 10,000 kg/ha with no N, 12,470 kg/ha with nitrate ammonium carriers, and 11,530 kg/ha with urea-formaldehyde sources.

Key Words: Nitrogen carriers • Risidual nitrogen • Dryland grain production

1 Contribution from the Northern Plains Branch, Soil and Water Conservation Research Division, Agricultural Research Service, USDA

2 Soil Scientist and Research Soil Scientist, USDA, Mandan, N. D.

Received for publication November 6, 1971.




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Copyright © 1972 by the American Society of Agronomy.