The Integration of Manure and Potassium Applications to Improve the Yield and Quality of Sweet Potato (Ipomoea batatas L)
The combination of organic and inorganic fertilizers for increasing the yield of sweet potato is better than providing a singular fertilizer. Therefore, this study aimed to determine the composition of KCl fertilizer dosage in various types of manure to increase the yield and quality of sweet potatoes. Meanwhile, a factorial randomized block design was used, and the first treatment was the KCl fertilizer dosage consisting of 50, 100, and 150 kg ha-1. Furthermore, the second factor was the various types of manure, including goat, buffalo, cow, chicken, and control. All the treatment combinations were replicated three times, and each consisted of five samples. Meanwhile, the result evaluation was conducted on the fresh tuber weight, number, and harvest index. Also, an evaluation of the quality was conducted on carbohydrate content and total dissolved solids. The results showed that manure had more effect on all the outcome variables than KCl fertilization. Moreover, the interaction between KCl fertilizer and manure only affected carbohydrate content, while total dissolved solids were not affected.
Keywords: carbohydrate, inorganic fertilizers, integration, manure, total solid soluble.
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