Farmers also planted potato low yield due to improper fertilizer soil management with varieties grown in which fertilizer is one of the important factors that help to increase the productivity and quality of sweet potato. Fertilizer application to meet the needs of potato planted in rice, he surely must have a quantity of fertilizer that is different from the required alarm conditions in General and may vary in each species. Therefore, according to the fertilizer application technology analysis is one way to increase productivity and the quality is great, and no more than necessary. Department of agriculture, agricultural research and Development Center in Phichit have flesh sweet potato breeding purple phot. 65-3. Yaori-shaped head, the skin is red meat an average head size, purple width: 3.5 cm length: 13.6 cm age harvest 90-110 days, average productivity 2100 kg per Rai (Office of research and development, agricultural region 2, 2554 (2011)) is a species with good market potential in competition because it has met the market would like to use it in conjunction with a comparison to the appropriate fertilizer combined with varieties of farmers and fertilizer application on agricultural methods and the original batayu account. As an alternative to using the appropriate fertilizer for the farmers to increase productivity of Don with increased revenue.
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