Developing cotton cultivars with a high yielding potential, nutrients extract and efficient, fiber attributes, earliness, high oil as well as protein cottonseed contents and pest resistance across variable environments is of great importance of cotton breeding programmer in Egypt. The field experiments were carried out at Agric. Res. and Exp. Stat., Fac. Agric., Cairo Univ., Giza, Egypt during 2017 season and repeated in 2018 season to evaluate the productivity and fiber technology response of three new released Egyptian cotton cultivars namely; Giza 93, Giza 94 and Giza 95 to three nitrogen fertilizer sources i.e. urea (U -46.5%N), ammonium nitrate (AN-33.5%N) and ammonium sulfate (AS -20.5%N). The randomized complete block design with split-plot arrangement with three replications was used. The main plots were devoted to cotton cultivars and the nitrogen fertilizer sources was randomly distributed in sub-plots. Giza 93 cultivar had the superiority over other cultivars concerning growth attributes, yield and yield components, chemical and biochemical constituents of foliage and seeds of cotton as well as fiber technology parameters. Generally, nitrogen fertilizer sources had a significant effect on growth attributes, yield as well as its components, fiber technological parameters, chemical and biochemical constituents of foliage and seeds of cotton whereas, ammonium sulfate was superior in plant height, 1 st sympodial node, no. sympodial branches plant -1 , no. total bolls plant -1 , boll weight, seed index, lint %, seed cotton yield fed -1 , fiber technological parameters, chemical as well as biochemical constituents of foliage and seeds of cotton. Significant cotton cultivars × nitrogen fertilizer sources interactions existed on most of studied traits.

Two field experiments were conducted at Agricultural Research and Experimental Station, Faculty of Agriculture, Cairo University, Giza, Egypt during 2017 and 2018 seasons to evaluate the response of two Egyptian cotton cultivars to the balanced between macro and micro fertilization as foliar application. The experiment included 14 treatments which were the combination of two cultivar and the foliar application of six chemical nutrient solutions (zinc 100 mg/L, zinc 200 mg/L, boron 500 mg/L, boron 1000 mg/L, novatreen 1L/fed and citreen 1 L/fed) in addition to control treatment. The experiment was laid out in a randomized complete block design with split plot arrangement with three replications. The cultivars were allocated in the main plots and the foliar application of nutrient were distributed in sub-plots. The two cultivars significantly varied in almost of studied traits. Giza 196 cultivar significantly exceeded Giza 195 in plant height, number of sympodial branches/plant, total number of bolls/plant, boll weight, seed index, lint%, seed cotton yield. Also, Giza 196 significantly surpassed Giza 195 in fiber length, fiber strength, fiber elongation and micronaire. Compared with control, the foliar of nutrient solutions significantly increased growth characters, seed cotton yield and yield components. Furthermore, spraying of nutrient solutions significantly improved fiber technology characters, macro and micronutrients contents of cotton leaves, biochemical compositions of leaves and both oil and protein contents of cotton seed in both seasons. Generally, novatreen recorded the best for all studied characters. The interaction between cotton cultivars and nutrient solutions was significant regarding most of studied traits.