Study on the Recycling of Vetiver Residue for Compost Production   Supaporn Junrungreang Prachaya Dhanyadee Piratcha Wassananukul and Siangleaw Piriyaprin   ABSTRACT         Study on the recycling of Vetiver residue for compost production was carried out in Ratburi, Chachoengsao, and Srisaket Provinces during 1994-1995. The experimental design was observation trial in 3 replication which analized by regression and corelation. There were 4 treatment which consisted of Vetiver residue add DLD-1 micro-organism activator pile on the floor and in the pit, Vetiver residue add Hi-tech micro-organism activator pile on the floor and in the pit. It was indicated that C/N ratio in compost pile add DLD-1 activator on floor and in the pit,compost pile add Hi-tech activator in the pit and on the floor were 18, 21, 23 and 25 respectively at 150 days. It was showed that the amount of cellulytic bacteria, actinomycetes and fungi were in peak during 30-60 day. The amount of cellulytic bacteria of compost pile add DLD-1 activator on the floor and in the pit, compost pile add Hi-tech in the pit and on the floor were 11.37, 10.16, 9.90 and 10.07 log no/g during 30 days which the same tendency of fungi at 60 days were 5.45, 4.88, 4.28 and 4.32 log no/g respectively. The amount of cellulytic actinomycetes at 60 days were 10.7, 10.25, 8.97 and 9.40 log no/g respectively. The nutrient content in compost such as nitrogen which made from Vetiver residue add DLD-1 micro-organism activator pile on the floor and in the pit, Vetiver residue add Hi-tech micro-organism activator pile on the floor and in the pit were 0.95, 1.02, 0.87 and 1.07% respechtivety. The amount of phosphorus in compost which add DLD-1 micro-organism activator pile on the floor and in the pit, add Hi-tech micro-organism activator pile on the floor and in the pit were 0.39, 0.44, 0.40 and 0.34% Potassium were 0.58, 0.51, 0.52 and 0.37% respectively. The average pH level in compost pile was in the range 7-7.5         Keywords : vetiver, C/N ratio, actinomycetes