From the following research results show that of groups of uncovered land of types I, II, III in Yen Ninh and Yen Do communes of Phu Luong disbict and Tan Long commune of Dong Hy disbict of Thai Nguyen province are barren land in term of physical and chemical properties and nubient elements such as hwnus content in soil in range from 0.17 percent to 3.8 percent
pH in range from 4.3 to 5.5
P2O5 in range from 0.018 percent to 0.2 percent, mechanical component in the operation of soil profile in which coasse sand content ranged from 20.3 - 92.35 percent , the content of limon and clay content are suitble for flant devolopment Therefore, it is necessary to improve the physical and chemical properties under the method of selection of crops such as Acacia mangium, Acacia awiculifonnis and Leguminosaeto increase nubients and reduce acidity and limit soil erosion and runoff.