Abstract:
Tlic impact study of' sulfur compounds; sulliw powclcr (S), gypsum (CaSO,) and sodi~m sulhtc (Na,SO,) at foul. concentrations; 0 (control), 100, 200 and 300 kg Slrai on growth, methane production and methane emission of ricc (Oryza sativrl L.) cv. Supanburi 1 was conducted using Bangkhen soil serfes. Thc results showed that different sulfur compouncls did not affcct mcthanc production but conccntration of sulfur conipounds affcctctl methane production. It was also shown that maximum of mcthanc production occurrcd in thc controllcd soil. In addition, thc controllctl soil has the highest pll but soil rcdox potcntial, sulhtc concentration in soil and water, total sulfide in soil and water werc the lowest. Using sulfur at 300 kg Slrai rcsultcd in thc lowcsl mcthanc production and soil pH but the highest soil rcdox potential, sulfate conccntration, total sulfidc in soil and watcr. Howcvcr, the interaction between methane production, soil pl l and soi1 redox potentialwas nor signilicantly different. Moreover thc results showcd that ricc cv. Supanburi 1 grown in control soil rcsultccl in the maximum methane flux 13tc at both vcgctarivc and rcpi-oductivc pliasc. Addcd a high concentration of sulfilr could rcducc mcthanc llux ratc at 29-65 percentage.The soil applicd with sodium sullitc at 300 kg S/rai had the minimum methane flux rate. It also showed that there was no interaction between methanc flux ratc and soil pH, soil rcdox porcnlial, soil temperature, air tempcralurc, watcr tcmpcraturc and shoot growth of ricc. Finally, the effect of different sulfur compounds on ricc growth sliowcd that sulfur could increase shoot growth, amount of sulfatc in shoot and harvesting indcx. I-lowcvcr, tlic crfcct of sulfilr clid not show any difference in root Icngth, growth ratc, shootlsoot ratio, area of aercncliyma and acrcnchyma arcallcaf area ratio of ricc cv. Supanburi 1 throughout thc crop.