<p><em>Muara Sugihan is one of the tidal swamp areas for rubber plant cultivation in South Sumatera. A preliminary survey of the land suitability in 2012 described that there are two main problems, the shallow groundwater problem and low pH (2,87-3,05) between 40-100 depth that indicates the presence of pyrite layers. In the prior of planting, the water drainage has been done to maintain the water table. However, the water </em><em>drainage was excessive so that water </em><em>table reach 66 cm from soil surface hence </em><em>aerobic condition resulted in oxidation of </em><em>pyrite layer. The method used in this study </em><em>was</em><em> survey method </em><em>consist of</em><em> measur</em><em>ing</em><em> the girth of </em><em>2 years old </em><em>rubber plants and sampling of soil, leaves, and water </em><em>on</em><em> the trench and the river</em><em> which</em><em> indicated </em><em>the presence</em><em> </em><em>o</em><em>f pyrite layers </em><em>o</em><em>n tidal swam</em><em>p area,</em><em> Muara Sugihan. The </em><em>result showed that </em><em>the growth of the rubbe</em><em>r plants was</em><em> </em><em>inhibite</em><em>d</em><em>, where the</em><em> girth </em><em>was</em><em> 10 cm, while on </em><em>optimal </em><em>dry land </em><em>they</em><em> </em><em>normally </em><em>reached 18 cm. Leaf nutrient analysis showed there was deficient of P, K, and Zn, while on soil analysis showed a low P content. </em><em>T</em><em>he </em><em>pyrite was leach from the soil and </em><em>a</em><em>c</em><em>cu</em><em>m</em><em>ulat</em><em>e into water drainage will lead to </em><em>low pH of water. </em><em>This problem can be solved by water management improvement.</em></p><p><em> </em></p>