Abstract
The aims of this study were to evaluate the distribution of Aluminum fraction (Al) on the horizon of forest land, agroforestry, and dryland agriculture in West Java highland soils and looking correlation with soil chemical fertility, is pH, CEC, organic-C, total N, total P, available P and soil texture. The evaluation was carried out on the results of the analysis of soil samples taken at four soil horizons (Ao or Ap, A1 or A2, B1, and B2) in each land use. Al fractionation using extraction methods with different chemicals to find exchangeable Al (Alex), amorphous Al (Alo), amorphous Al organic (Alp), amorphous Al bound weakly to organically (Alcu), Amorphous Al bound strongly to organic (Alop), and amorphous Al inorganic (Alpcu). The results showed that the Alo fraction dominated the other Al fractions in each land use. In forest land Alo fraction (> 58.61%) with a fluctuating distribution pattern, in agroforestry (54.45%) with a declining distribution at the depth of the soil horizon, then on dryland agriculture (> 89.86%) it increases fluctuatively with the depth of the soil horizon. The addition of organic material/compost must be done to increase the organic-C content in the soil.
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