supplemented with rice bran were weighed 9:1 proportion. Then mixer of EFB and rice bran with inoculums were weighted 8:2 proportion for 35 days of composting. The temperature in compost piles rose to 59-64 c in the first days. The pH in compost pile rose to 7.7-8.2. The initial C:N ratios of the compost without inoculums (CA), compost supplemented with soil from mangosteen garden (cc), compost supplemented with soil from oil palm garden (CD), compost supplemented with inoculums of Land development department No.l(CF), compost supplemented with bamboo leaf litter (CB) and compost supplemented with soil from Kererat mountain (CE) were reduced to 19.7:1, 18.0:1, 17.6:1, 17:1, 16.6:1 and 15.5:1 respectively. Total of bacteria, fungi and actinomycete of all treatment were as standard compost with the value of (0. 22±0.02) X 10 – (2.67± 0.14) X 10 CFU/g dry weight, (3.82+0.23) X 105- (29.62± 2.21) X 105 CFU/g dry weight and (30. 00±4.58) X 105 – (3 79.33+ 16.62) X 105 CFU/g dry weight respectively. เท this study conclusion that soil from oil palm garden (D) is the best inoculum source for compost made from oil palm empty-fruit-bunches (EFB).
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