Kondisi Kimia Tanah Pada Tegakan Jati (Tectona Grandis Linn.F) Berbeda Umur Di Desa Towera Kecamatan Siniu Kabupaten Parigi Moutong

This research was carried out from July to September 2023 at two locations of teak stands, each 7 and
10 years old, in Towera Village, Siniu District, Parigi Moutong Regency. This research uses a field
survey method to determine the research location. Soil sampling was carried out deliberately (purposive
sampling), namely the sampling locations were located at 2 different teak stand locations. At each
location, 2 plots measuring 20m x 20 m were created. Each plot has 5 diagonal soil sampling points.
The soil samples taken were incomplete soil samples. Soil samples were taken under the stands at a
depth of 0-30 cm. At each point a 1kg soil sample was taken and then composited. After being
composited, 1kg was taken for analysis purposes. Each location contains 1 sample so there are a total
of 2 samples for laboratory analysis purposes. Incomplete soil sampling is used to analyze soil pH.
Nitrogen (N-total), Phosphorus (P-total), C-organic, and cation exchange capacity (CEC). The research
results show that the soil chemical conditions in 7 year old teak stands have a pH (H2O) value of 4.31
(acid), C-Organic 2.90% (medium), N-Total content 0.15% (medium), ( CEC 24.3 cmol(+)kg-1
(medium), and Phosphorus 27.4% mg/100gr (medium). Meanwhile, 10 year old teak stands have pH
(H2O) 5.17 (slightly acid), C-Organic. 3.60% (very high), N-Total content 0.17% (medium), CEC 22.1
cmol(+)kg-1 (medium), and phosphorus 44.5% mg/100gr (high).