Submerged aquatic flora are problem weeds, not only in aquatic bodies but also in wetland rice. An experiment was conducted at Kerala Agricultural University to assess the efficacy of different liming materials to manage submerged aquatic weeds in an eco-friendly manner. Preliminary studies were conducted in tanks containing Hydrilla spp., Najas spp. and Utricularia spp. Quicklime was effective among the three liming materials tested, while calcium carbonate and dolomite were ineffective. The increase in dose of quick lime from 2, 4, 6, 8 and 10 g/L of water in the tank resulted in a significant and rapid decline in chlorophyll content of weeds. Complete mortality of weeds occurred within four weeks of liming. In rice fields with acid soil, more than 80% weed control was observed with application of quicklime 300g/m2 or above, which resulted in rice grain yield comparable to hand weeded plot. Rapid fluctuations in various water quality parameters were observed, including pH, electrical conductivity (EC), acidity, alkalinity, carbonate, bicarbonate, nitrate, and hardness; but the values stabilized two weeks after application. The study revealed that the application of quicklime serves as an effective method for managing submerged freshwater aquatic weeds in rice.