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Effect of nitrogen fertilizer and its application time on growth and yield of two sunflower varieties



Effect of nitrogen fertilizer and its application time on growth and yield of two sunflower varieties



Bulletin of the National Research Centre 31(3): 233-243



THE TWO Sunflower (Helianthus annuus L.) varieties i.e., Vedoc and Malabar were grown under four different N fertilization treatments i.e., 45, 60, 75 and 90 kg N/fed. and three times of application i.e., 21, 30, and 40 days from sowing in two types of doses i.e., low as 15 units and high as 30 units of Nitrogen during 2003 and 2004 seasons at the experimental farm, Faculty of Agriculture, Minufiya University. The application of the various tested fertilization treatments caused an increase in all studied traits except in the oil content. The treatment of 75 kg N/fed. gave the highest values for the most vegetative, yield and its components as well as oil yield. Variety Vedoc was better than cv. Malabar in all vegetative growth and all yield components characters under study, which lead to increase seed yield and oil yield. The maximum sunflower seed production with good quality was obtained by the application of 75 kg N/fed. which was added in three doses (LHH) as 15 units at 21 days, 30 units at 30 days and 30 units at 40 days after sowing for both tested varieties.

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