T1: control ; T2: sesbania debris 2t rai-1 ; T3: sesbania debris 2 t rai-1 and pumice sulfate 50 kg rai-1; T4: sesbania debris 2 t rai-1 and pumice sulfate 100 kg rai-1; T5: sesbania debris 2 t rai-1 and pumice sulfate 200 kg rai-1 2/GWP as CO2-e = TME*23, GWP as C-e = GWP as CO2-e*12/44 Means followed by the different letters in each column were significantly different by LSD at P < 0.05