Thesis (Ph.D.) - Cairo University - Faculty of Agriculture - Department of Agronomy

Two field experiments were carried out at the Agricultural Experimental and Research Station, Faculty of Agriculture, Cairo University, Giza, Egypt in two seasons in years 2016 and 2017 to evaluate NPK nano-fertilizers application, times, methods and rates on vegetation growth analysis, yield and fiber properties of Egyptian cotton cultivar (Giza 90). The experiment was laid out in a split-split plot in a randomized complete block design arrangement with four replications. Treatments included two application times were applied in main plots, two application methods foliar and soil in sub-plots and four rates applications of control (100% soil application traditional recommended NPK fertilizer dose (RFD) and nano NPK fertilizers 12.5%, 25% and 50% RFD) were applied in sub-sub-plots. Obtained results indicated that, the application of three times of NPK nano-fertilizers gave higher plants, total dry weight, crop growth rate, relative growth rate, leaf area and leaf area index than two times. Foliar NPK nano fertilizers application of all traits recorded higher values of most studied parameters than soil application. Nano-fertilizers at 50% RFD recorded values of studied parameter statistically at par with control traditional (100% RFD). Treatments of 12.5% were at par with 25% NPK nano fertilizers for the most studied growth parameters. Interactions between the studied three factors were significant in some growth stages

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