Mosaad I. S. and K. F. Fouda( 2016). Effect of Potassium and Nitrogen Fertilization on Some Macronutrients Utilization Efficiency by WheatEgypt. J. Soil. Sci. Vol. 56, No. 3, pp. 373- 384 (2016)
Abstract: TO STUDY the effect of potassium and nitrogen fertilization treatments on wheat yield, P & K uptake and P & K utilization efficiency for wheat (Triticum aestivum, L.), variety Sakha 93, two field experiments were conducted on a clay saline soil at El-Serw Agricultural Research Station, Agricultural Research Center, Egypt during 2011/2012 and 2012/2013 winter seasons. The experiments were carried out in a split plot design with four replicates. Main plots were assigned to potassium applications (0, 47.4 & 94.8 kg K ha-1). The sub plots were divided by mineral nitrogen treatments as follows:
44.5, 89, 133.5, 178 and 214 kg N ha-1. Wheat yield (grain & straw) and P & K-uptake by (wheat grain & straw) increased with increasing potassium rate up to 94.8 kg K ha-1, but P & K utilization efficiency by wheat crop was decreased. Also, these results showed that 214, 178, 133.5, 89 and 44.5 kg N ha-1, respectively gave the highest values of the previous parameters except the PUtE and KUtE, where the order of values was upward with the order of the previous treatments. The interaction between 94.8 kg K ha-1 and 214 kg N ha-1 gave the highest wheat yield (grain & straw) and P & K uptake by grain and straw and gave the lowest PUtE and KUtE in both seasons. So, it is preferred to add 94.8 kg K and 214 kg N ha-1 to economic production of wheat grain and straw especially in saline soil. Also, the highest results of PUtE and KUtE in both seasons were obtained with interaction between 0 kg K ha-1 and 44.5 kg N ha-1, it indicates shortages in uptake of phosphorus & potassium with nitrogen & potassium deficiency.
Keywords: (Wheat, Nitrogen, Potassium, Fertilization, Phosphorus, Efficiency.)
