Populasi Mikroba Tanah Pada Tegakan Jati (Tectona Grandis L.F.) Umur 10 Dan 17 Tahun Di Desa Oti, Kecamatan Sindue Tobata, Kabupaten Donggala

Soil fertility is very important for plant growth because the nutritional intake for plants is provided by
the soil. One way to determine soil fertility is the biological aspect of the soil. The biological quality of
soil increases with the presence of soil microorganisms, especially in the rhizosphere, this is because
in the soil microorganisms have quite complex roles, starting from mineralization, nitrogen fixation,
nutrification, phosphate solubilization, antibiosis, siderophore production, plant growth regulation,
and induction of plant resistance. This research aims to determina the population of soil microbes in
teak groves (tectona grandis L.F) of different ages, namely 17 years old and 10 years old in oti village,
Sindue Tobata District, Donggala Regency. This research was carried out from April 2023 to July
2023. Soil samples were taken from teak (Tectona grandis L.F) stands of different ages, namely 17
years old and 10 years old in Oti Village, Sindue Tobata District, Donggala Regency. This research
started from a field survey, determining sampling points, the sample points were carried out
deliberately (purpose sampling). Soil samples were taken at a depth of 0-10cm. identification of soil
bacteria and fungi was carried out using the petri dish method with a dilution series of 10?4
- 10?7
and then counted using a colony counter. The results of the study showed that the population of soil
bacteria in teak aged 17 years was higher, namely 197,1 × 105 CFU g
?1
compared to teak aged 10
years, namely only 111,7 × 105 CFU g
?1
. Meanwhile, the population of soil fungi was higher in
teak aged 10 years, namely 104,2 × 104 CFU g
?1
, compared to teak aged 17 years , 82,2 × 104
CFU g
?1