Varying rates of nitrogen and phosphorus were applied to hard red spring wheat grown on stubble fields at three locations in southern Alberta in 1955 and 1956. Significant yield increases were obtained at the three locations in 1955 as a result of applications of nitrogen. At two of the three locations further increases in yield resulted from the addition of phosphorus. In 1956 significant yield increases were obtained at two of the three locations following nitrogen applications, and at only one of these locations did the addition of phosphorus result in further significant increases in yield. At two of the three locations in both 1955 and 1956 high rates of nitrogen fertilizer caused significant increases in protein content over the unfertilized check. Phosphorus additions significantly reduced the effect of nitrogen on the protein content at one location in one year, but had no consistent effect in the other experiments. The experimental results indicate that, when moisture is adequate, more than 40 lb. of nitrogen per acre, and at least 80 lb. per acre in some cases, must be applied before increases in protein content of spring wheat can be expected.
Nitrogen Fertilizer and Residue Management in Dryland No‐Till Hard Red Spring Wheat
