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This study area was used to be covered by teak forest. However, because of the human influences, the land use was changed to rice field, shrubs, dry field, settlement and remaining teak forest. The aimed of this research is to study the soil chemical and physical characteristics as a base in improving its quality. The soil samples were taken from the field at 5 land use types with 4 repetitions. Then, they were analyzed in the laboratory. This research resulted that all areas have the soil acidity of more than 8 and the soil organic content of 2.72 % to 3.69 %, whereas the Nitrogen content varies from 0.2 % to 0.29 %. Furthermore, the Phosphorus content varies from 4.61 mg · L‒1 to 21.07 mg ⋅ L‒1. The available potassium ranges from 0.78 cmol ⋅ kg–1 to 1.99 cmol ⋅ kg–1. The soil physical characteristics of the study area showed that the bulk density varies around 1 Mg ⋅ m–3 and the particle density of 2.13 Mg ⋅ m–3 to 2.27 Mg ⋅ m–3. The porosity also varies from 46.30 % to 60.80 %, whereas the soil permeability ranges widely from 1.4 cm ⋅ h–1 to 25.9 cm ⋅ h–1. In conclusion, the study area has the high soil acidity, relatively high soil organic matter content, low nitrogen, phosphor and potassium, good porosity and relatively bad permeability. To achieve sustainable forest land use, the use of fertilizer is required, also the implementation of soil tillage is recommended to improve the soil physical characteristics.

Soil chemical and physical characteristics as a base for achieving sustainable forest land use in RPH Watugudel, KPH Ngawi, Jawa Timur