Abstract
AbstractThe 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 0, 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 × 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.
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