Nitrogen and phosphate are the kinds of nutrients needed by the mangrove land. In wetland sediments, ammonium is the first form of inorganic nitrogen. Ammonium will interact with oxygen and oxidized to nitrate. Through the process of denitrification, nitrate will change in microbial become N2O and N2. Same with nitrogen in the wetlands of dissolved phosphate concentration is also affected by salinity where solution phosphate concentration will be reduced by increasing levels of salinity (Robertson and Blaber 1992 in Loi Tan Le 2008). The limited amount of phosphate will slow the growth of mangrove (Broome et al 1994 in Loi Tan Le, 2008).
Mangrove forest into land for disposal of waste water it would benefit primarily for plant growth and productivity of mangrove ecosystems derived from nutrients supplied by the waste water (Boto 1996 in YSWong et all 1997). Research Henry (1978) in YSWong (1997) reported that nutrient levels in leaves of mangroves which receives waste water is significantly higher than those who did not receive waste water. However, nutrient levels in leaves of the same value with the nutrients in the root zone.