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Abstract
Two field experiments were carried out in Giza Agricultural Experimental and Research Station, Faculty of Agriculture, Cairo University in two seasons (2012 and 2013) to study the effect of foliar application of micronutrients (boron, zinc manganese and iron) on growth, yield and fiber quality of some Egyptian cotton cultivars (Giza 88, Giza 90 and Giza 92). The experiment was laid out in a split plot design in a randomized complete block design arrangement with four replications. Treatments included three cultivars were applied in main plots and nine foliar applications of micronutrients (control, boron 500, 1000 and each of zinc, manganese and iron 100, 200 mgl-1) were applied in sub-plots. Spraying took place twice, at the beginning of the flowering stage and 15 days later. Cotton cultivars were planted during the first week of April and harvested in October for both seasons. The results showed that, cultivars varied significantly in the studied parameters except position of the first sympodial node, number of total nodes per plant in both seasons and earliness% and fiber strength in the second season only