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The experimental study was for the field trials of yield response and soil nutrient change of sweet potato varieties to different fertilization treatment conducted at the highland agricultural development station under the royal initiative, Ban Pa Kha, Kamphaeng Phet, Thailand. The objectives of this research are to compare yield weight and soil nutrient change of sweet potato under different fertilizer uses. Trials were planted in 4 months by using two species of sweet potato (A) sweet potato cultivars Okinawan (Ipomoea batatas var. batatas), and (B) Native sweet potato (Ipomoea batatas L. Lam.). The result show that yield of sweet potato (A) was significantly lower than that sweet potato (B). The maximum yield weight was sweet potato (B) in plot 3 (0.96 Kg/Tree), using 150 kg of compost fertilizer and the yield weight of sweet potato (A) show the lowest yield weight in the plot 4 (0.27 Kg/Tree), which was the control plot with natural condition. The chemical fertilizer formula (N13-P13-K21) used in the sweet potato cultivation by Hmong hill tribe farmers were lower quantity of K and P, while the amount of N in such formula used was suitable to the growing needs. However, the studies have also shown that sweet potato is unsuitable for upstream cultivation due to their high uptake of soil nutrients., which could cause soil deterioration.
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