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Influence of nitrogen source and rate on growth of spring grain and soil pH

Alessi, J., Power, J.F.
Agronomy journal 1972 v.64 no.4 pp. 506
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.