The Influence of Fertilizers and Irrigation on Growth and Yield of Sweet-Potato

The studies revealed that as the nitrogen application was increased from 28 kg to 56 kg/ha. there was a corresponding increase in the total vine growth, root size and yield. By increasing nitrogen dose from 56 kg to 84 kg there was a slight increase in the vegetative growth but yield was decreased. Application of potash and various irrigation intervals did not affect the top growth and root development significantly. Among the various interactions IxK affected only root circumference. Combination of potash 34 kg with 7 days and 5 days interval and without potash with 5 days and 3 days intervals were equally effective for increasing the root thickness. The interaction I X N X K affected number of roots per plant and length and thickness of roots. The best combinations for these characters were nitrogen 84 kg, potash 34 kg with 3 and 7 days interval and nitrogen 84 kg without potash with 5 days interval.