Abstract
Climate change significantly impacts sweet potato production because of the high potential for drought conditions. Understanding the regional impacts of climate change on the irrigation interval is important for effective water resource management. This study aims at determining the influence of the irrigation interval on the drought tolerance responses of two new sweet potato varieties from Universitas Padjadjaran. The experiment was arranged in a randomized block design (RBD) with two factors. The first factor was two varieties of sweet potato i.e. Awachy-1 (Orange-Fleshed) and Biang (Purple-Fleshed); and the second factor was the irrigation interval (1, 3, 5 and 7 days). This research was conducted in a screen house of Ciparanje experimental field station, Universitas Padjadjaran Jatinangor. Experimental results showed no interaction between the irrigation intervals and the varieties on the sweet potato's yield components and nutritional content. Biang provided the most optimal result regarding the number of tubers and dry mass, despite being watered once every three days. Biang also produced a higher number of tubers, shorter sweet potato length and higher dry weight than Awachy-1 in every irrigation interval. Biang also showed a higher value for nutritional content than Awachy 1 on total soluble solids, sugar and carbohydrate content. The optimal water usage to store the root yield of Biang and Awachy-1 is one to three days of irrigation intervals on the sweet potato’s tuber diameter and the plant's dry weight. However, the irrigation interval that most significantly improved the weight of the tuber was one day, while the increased nutritional content of the tuber was three days. Biang and Awachy-1 cultivars could survive under drought conditions, although some yield components had decreased. These results suggested that the varieties or watering interval affected sweet potato growth and yield components.
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