Sweet potato plant is planted in Phichit kasatrakrechangwat Don and NA, according to state data, production plants, annual plants, types of potato crops group pichit annual 56 2555 (2012)/2555 (2012) during the period April to November 2556 (2013) found that the district has a total area of planted potato planting is equal to 620 acres on average yield at harvest is equal to the average output kg/712000 space harvest is equal to 1, the price farmers get 186.67 kg average 8.09 baht/kilogram, with planted sea protocol such as District 2 district. 20 acres of planted space, and bueng na rang of 600 Rai (Department of export promotion, agriculture, 2556 (2013)) Phichit province, Potato farmers planted popular sweet potato purple body type, which is known as species of shrimp paste. There is a dark purple meat output averaged 1900 kg sweet potato farmers planted crops but also have low productivity 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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