Biomass accumulation of Pangola grass was sampled for four times between August 28, 2006 and October 23, 2006. It was sampled at 2 weeks interval,the first sampling was conducted on September 11,the 2nd on September 25, the 3rd on October 9 and the4 th on 23 October by clipping five 0.16 m2 quadrates per plot at approximately 3 cm stubble height with scissor. According to random sampling, no area within plot was clipped more than once so that all clipped forage was original regrowth. All clipped forage samples were weighed and dried individually under hot air oven at 60 C for 48 hr. Dry weights for each quadrate sample were used to estimate available forage yield. All of weeds and death materials were separated by hand and removed before available forage calculation and subsequent analysis. Soil sampling was conducted at the end of experiment in which it was dried in shed, ground though a 1 mm screen and stored in bottle for S concentration analysis.