EVALUASI STATUS KESUBURAN KIMIA TANAH PADA BEBERAPA SUBGROUP TANAH DI KECAMATAN TIDORE TIMUR
This study aims to determine soil chemical characteristics, soil fertility status and alternative soil management to improve soil fertility in East Tidore District. This study uses a land survey method with a free survey observation distance system. Soil sampling is carried out in the upper layer (0-30cm) and lower layer (30-60 cm). Data analysis by giving soil characteristics according to criteria of soil chemical properties (PPT, 1993) and soil fertility status refers to soil fertility classification criteria (PPT, 1983). The results showed the average soil chemical properties in the upper layer (0-30 cm) included soil acidity (pH) classified as neutral (pH 6.7), c-organic classified as moderate (2.20%), CEC was classified as medium ( 22.63 cmol (+) / kg), wet saturation (KB) classified as moderate (55%), Nitrogen nutrient classified as low (0.19%), Phospor classified as moderate (31.79 mg / 100g) and moderate potassium (21.09 mg / 100g). In the lower layer (0-30 cm) the condition of soil acidity (pH) was classified as somewhat acidic (pH 6.4), c-organic was low (1.56%), CEC was classified as medium (22.21 cmol (+) / kg), wet saturation (KB) is classified as moderate (44%), Nitrogen is low (0.12%), Phospor is medium (27.45 mg / 100g) and Potassium is low (19.443 mg / 100g). The average fertility level of topsoil (0-30 cm) is classified as medium, while the lower layer (30-60 cm) is low. Soil management can be done to improve soil fertility through the provision of organic matter and liming, followed by fertilization by using Urea, SP36 and KCL fertilizers. In addition, soil conservation measures including leg cover cover planting and green fertilizer plants are also needed in an effort to prevent soil erosion, increase organic matter and soil nutrients, especially nitrogen and increase cation exchange capacity (CEC) of land.