The field study was conducted at Hippnalli watershed of Uttar Kannada district during the year 2010-11. The experiment was laid out in split plot design with moisture conservation methods as main plot treatments viz., Ring trenching, Staggered trenching and Half ring basin and application of manure and fertilizer as sub plot treatments viz., Farm yard manure (FYM) (5 t/ha), Vermicompost (2.5 t/ha), Poultry manure (1.25 t/ha), Mycorrhizea + Phosphorus solubalising bacteria (PSB) (30 gm /plant) and Recommended dose of fertilizer (RDF) (NPK 200 : 100 : 100 kg/ha) + FYM. Treatments were imposed on 3 year old Acacia mangium plantation planted at 2 x 1.5 m spacing. The results indicated that, the plant height was significantly influenced by ring trenching (6.82 m) as compare to control. The average volume of wood increment was 26.19 m3/ha/yr due to ring trenching followed by staggered trench (20.46 m3/ha /year) as compare to control (9.81 m3/ha /year). The application of RDF with FYM significantly increased the plant height (4.43 m) and wood volume (10.50 m3/ha/year). The combination of ring trenching with RDF + FYM showed significantly higher plant volume to the extent of 41.96 m3 per ha per year.