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Agronomy Journal Abstract -

Growth, Yields, and Yield Components of Safflower as Affected by Source, Rate, and Time of Application of Nitrogen1


This article in AJ

  1. Vol. 59 No. 1, p. 54-56
    Received: June 22, 1966

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  1. Norris W. Gilbert and
  2. T. C. Tucker2



The effect of source, rate, and time of application of N on the yield and yield components of irrigated safflower was studied at Mesa, Arizona. Yield increased with each 50-lb. increment of N up to 150 lb., applied as ammonium nitrate at planting in December. Further increases occurred when half was applied at planting and half in the spring. Urea at 50 lb. N preplant inhibited early seedling development, but yield was not lower than with ammonium nitrate at the same rate. Urea at 150 lb. N preplant resulted in failure to obtain stands in three replications and severe injury to seedlings in the remaining five. Ammonium nitrate at the same rate also resulted in some seedling injury but without significant stand reduction. Ammonium sulfate at the 50-lb. N preplant rate gave higher yields than urea at the same rate, but not significantly higher than ammonium nitrate. Yield was correlated most strongly with numbers of heads per plant. Seeds per head was affected to a minor degree, but significant differences in seed weight did not occur.

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