This study investigated some technological factors influence on hydrogen sulfide concentration and set up modelling relationship between hydrogen sulfide with the factors. The modelling can predicts hydrogen sulfide concentration in pond bottom and help famer to control H2S effectively. The study was designed and implemented with 3 experiments in which have four treatments for each (DC, M0, Ml, M2), in the bottom of the intensive Penaeus monodon shrimp ponds on the saline acid sulphate soil in Ca Mau province, from June in 2010 to August in 2011. With the same the conditions of experiments and difference between SAE, EM of treatments (DC, M0, Ml, M2), the hydrogen sulfide concentration were affected by the amount of feed, pH condition, and value of factors: SAE, EM. The result shown that the hydrogen sulfide concentration was high when increasing on the amount of feed and combine with pH condition in decrease
the increasing value of factors: SAE and EM caused the decreasing on the hydrogen sulfide concentration. The hydrogen sulfide concentration at the treatments was range in DC (0.00 - 0.54 mg/L), MO (0.01 - 0.42 mg/L), Ml (0.00 - 0.14 mg/L), M2 (0.00 - 0.10 mg/L), corresponding to the amount of feed: DC (1.0 - 8.2 g/m2/day), M0 (0.7 - 8.7 g/m2/day), Ml (0.7 - 11.4 g/m2/day), M2 (0.8 - 13.6 g/m2/day), and pH value: DC (7.8 - 6.7), M0 (7.8 - 6.9), Ml (7.8 - 7.3), M2 (7.8 - 7.5). Hydrogen sulfide concentration was interpreted as a function of the factors: TA, SAE, EM and pH as follows: Sqrt(H2S) = 1.88602 + 0.01355TA - 0.02952SAE - 0.22191pH - 0.00545EM. In that the Sqrt(H2S) factor had positive correlation with the TA factor with value of r = 0.4356
and negative correlation with SAE, EM and pH corresponding to r value: -0.3427
- 0.4446
-0.90055. This can provide information to farmers for controling hydrogen sulfide concentration and improve the efficiency of shrimp farming.