<em>The objective of this research was to determine some soil hemical properties� and the growth of� sweet potato� (Ipomoea batatas (L.) Lamb) as an effects� of Crandalitte Extract, Humat� Fraction, and Potassium application on Acid Mineral Soil of Warmare..� The pot experiment was conducted in the Screen house, Department of Soil Science Faculty of� Agriculture and Agricultural Technology, State University� of Papua Manokwari,� from August 10<sup>th</sup>� to October 5<sup>th</sup> 2011.� The pot experiment has been done using� Completed Randomize Design with 7 treatments and four replications , namely �: A<sub>0</sub> = no fertilizer (treatment);� A<sub>1</sub> = 100% crandalitte extract + 0% organic fraction + 0% potassium;A<sub>2</sub> = 80% crandalitte extract + 10%� organic fraction + 10% potassium;A<sub>3</sub> = 60% crandalitte extract + 20%� organic fraction +2 0% potassium;A<sub>4</sub> = 40% crandalitte extract + 30%� organic fraction + 30% potassium;A<sub>5</sub> = 20% crandalitte extract + 40%� organic fraction + 40% potassium, and;A<sub>6</sub> = 0% crandalitte extract + 50%� organic fraction + 50% potassium.� The dosage of each treatment was 100 liter ha<sup>-1 </sup>(4 g Pot <sup>-1</sup>). Some soil chemical characteristics were analyzed for pH (H<sub>2</sub>O), pH (KCl), N-Total, P-available, K-total, and Al-exchangeable. While the plant growth variables were measured� mainly for long steam on 5, 6, 7 and 8 weeks� after planting, biomass of trubus, and the length of root and steam were measured at the end of vegetative growth� on 8 weeks� after planting. Data were analyzed using statistical analyses of Analysis of Variance (F Test) and DMRT test. The result showed that the application of� crandalitte extract, humic fraction and potassium was significantly increased the� status of P-available and H-exchangeable, but not affected significantly for� other soil chemical characteristics (pH H<sub>2</sub>O, pH KCl, C-organic percentage, N-total, and Al-exchangeable). Fresh and dry weight of� sweet potato trubus were also significantly affected by those application, however it was not affected significantly on long steam; wet weight and� dry weight of root and also root� length of sweet potato.� Among the treatments,� the A2 treatment (80% EFC : 10% Organic fraction : 10% Potassium) showed a better value� of the status P-available, H-exchangeable and the biomass of trubus.� This might be related to the� characteristic of acid mineral soil� that need high P fertilizer and the� balance application of�� organic matter and potassium.</em>