Effect of NPK and irrigation interval on growth and grain yield of wheat (Triticum aestivum L.)

Ibrahim E. Mohamed, Assad F. Garib, Mohamed A. Awad Elkareem


Field experiments were conducted for seasons 2004/05 and 2005/06 at the experimental farm of the Faculty of Agricultural Sciences, University of Gezira, Wad Medani, Sudan (latitude 140 24 N and longitude 330 38 E) to investigate the effect of three levels of NPK added in the form of Nitrophoska (18-18-5) and irrigation intervals on growth, yield components and yield of wheat (cultivar Elnilain). The split plot design with four replications was used. Three irrigation intervals (7, 14 and 21 days) were assigned to the main plots and three NPK levels (0, 240 and 480 kg/ha) were in the subplots. NPK application and irrigation intervals significantly (P<0.05) increased most of the parameters measured. Application of 480 kg NPK/ha significantly increased plant height, plant dry weight, number of tillers, number of spikelets per spike, number of seeds per spike, 1000 seed weight and the final grain yield. Irrigation intervals, on the other hand, at 7 and 14 days significantly increased most of the characters under study when compared to those irrigated every 21 days. The interaction of NPK and irrigation interval showed that most of the traits measured were superior when 480 kg NPK/ha was applied for wheat plants irrigated every 7 or 14 days. The highest grain yield of 1635 kg/ha in the first season and 2350 kg/ha in the second season, were achieved when 480 kg/ha of Nitrophoska was added to wheat plants irrigated every 7 days. The results of this experiment indicated that in order of to obtain the highest yield of wheat, 480 kg NPK/ha, in the form of Nitrophoska, should be applied at sowing and under the prevailing

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