VARIABILITY OF GRAIN AND OIL YIELD IN SPRING SAFFLOWER AS AFFECTED BY NITROGEN APPLICATION |
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| Authors: | Reza Soleimani |
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| Institution: | Soil and Water Research Institute, and Ilam Agriculture and Natural Resources Research Center , Ilam, Iran |
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| 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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| Keywords: | nitrogen (N) safflower grain oil yield |
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