Thesis (M.Sc.) - Cairo University - Faculty of Agriculture - Department of Vegetable

The experiments in this study were conducted at the Experimental farm of Vegetable Crops, Medicinal and Aromatic plants Research Institute. Agriculture Research Center. Dokki, Giza, during two successful seasons 2016/2017 and 2017/2018. This study aimed to investigate sequences of yam plant to identify the correct specie, the effects of application of gibberellic acid (GA3) and benzyladinine (BA) on yam tuber dormancy, to determinate the most appropriate dates for planting in Egypt, the best level of potassium for the highest productivity and the interaction between planting dates and potassium fertilizer on plant growth, yield and its components. The experimental design was split plot design with three replicates. The main plot was three different planting dates (1st of May, 1st of June and 1st of July). The sub plot was three levels of potassium fertilizer (96, 144, 192 kg/fed K2O) in the form of potassium sulphate (48% K2O) and control treatment (without adding potassium fertilizer). as well as storability of yam tubers, sp Dioscorea abyssinica grown in clay soil. Results show that highest sprouting percent (100%) was obtained with 1.0 mg/l BA. The combination between K2O at 144 kg/fed with 1st June sowing date gave the highest vine length, leaf area, total chlorophyll, No/lateral branch/plant, tuber length, tuber diameter, fresh weight of tuber/plant, total yield/plot, total yield/fed, dry matter, starch, Ca, K, P, N, and total nitrogen in both seasons. Shelf life of yam tubers at room temperature was about two months

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