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  • Author or Editor: Adel F. Ahmed x
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Hot pepper (Capsicum annuum cv. Battle) was grown in a 1:1 v/v sand-to-cotton stalk compost and subjected to four irrigation treatments: 100% of water-holding capacity (control) and 85%, 70%, and 55% of water-holding capacity, which were considered deficit irrigation treatments. All treatments were given to the plants at the first day of transplanting and continued during the whole growing season. Our results demonstrated that deficit irrigation had a negative effect on plant growth and yield. Increasing irrigation deficiency exhibited a reduction in vegetative growth, fruit parameters, and yield and a nonsignificant increase in irrigation water use efficiency and a corresponding reduction in the amount of irrigation water. Vitamin C content in fruit was significantly decreased by deficit irrigation treatments at various ripening stages. Water-holding capacity of 100% and 85%, respectively, resulted in the highest content of vitamin C obtained at the ripening stage. We concluded that ‘Battle’ hot pepper is sensitive to deficit irrigation. Supplying this cultivar with water at 85% of water-holding capacity could be a practical irrigation technique for high value of vitamin C production as well as saving a large amount of water, which outweighs the decrease in total fresh yield of fruit, especially in areas suffering from water shortage.

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Gamma irradiation (12 Krad) was more effective than preharvest application of maleic hydrazide (2500 ppm) in controlling sprouting and extending the storage life of garlic bulbs. Gamma irradiation decreased the length and thickness of internal sprouts and entirely prevented chlorophyll formation in sprouts; it decreased external discoloration and disease to a greater extent than did maleic hydrazide treatment. Both treated and untreated bulbs held in cold storage (0°C; 90-95% RH) showed a longer storage life than did those held in common storage (15-30°C; 50-75% RH). Gamma irradiation, maleic hydrazide treatment, and cold storage reduced weight loss and delayed emaciation.

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