This study was carried out at the Experimental Farm, Faculty of Agriculture, Sohag University, Sohag, Egypt during two successive winter seasons 2010/2011 and 2011/2012 to investigate the effect of nitrogen and potassium fertilization on onion seed production Improved Giza 6 cultivar. Three nitrogen rates (50, 100 and 150 kg feddan , one feddan= 0.42 ha) and three potassium rates (40, ...
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