Abstract
This research was carried out to determine the effects of rate and time of nitrogen (N) application on safflower in a calcareous soil. The nitrogen rates were 50, 75, 100, 125, and 150 kg ha−1 and three split application methods were used. Experimental treatments were conducted as a factorial in a randomized complete block design (RCBD) with three replications. Duncan's Multiple Range Test (DMRT) indicated that the three split application of 100 kg ha−1 of nitrogen in stages of sowing date, early stem elongation, and early flowering had higher grain yield (2627 kg ha−1) than other treatments. This result was forecasted by results of increases in number of heads per square meter (heads m−2), number of grains per head (grains/head), and thousand grain weight (TGW). The highest oil yield was 755 kg ha−1 with the 100 kg ha−1 nitrogen application and was 727 kg ha−1 in treatment of three split application.
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