Abstract: The experiment was laid in a split plot design with four replications. Five rice cultivars, i.e. Jasmine 105, RD 15, Klongluang 1, Suphanburi, and Phathumthani 1 were used as the main plots. Four types of soil conditions were used, i.e. control, added with filter cake at the rate of 18.75 t ha-1, added with sludge cake at the rate of 18.75 t ha-1 and added with chemical fertilizer 16-16-8 (NPK) at the rate of 187.50 kg ha-1. The results showed that filter cake and sludge cake significantly increased soil pH, soil organic matter, but slightly decreased soil electrical conductivity (EC) whilst chemical fertilizer did not. Both soil amendment materials diluted the mean value of Na from 3662 ppm to 1095 and 3340 ppm for filter cake and sludge cake, respectively. Both filter cake and sludge cake significantly increased plant heights, straw dry weights ha-1 and rice grain yields ha 1 of the five rice cultivars. Chemical fertilizer (16-16-8 NPK) gave the highest grain yield ha 1 followed by filter cake and sludge cake. Jasmine 105 cultivar gave the highest grain yield followed by RD 15, Klongluang 1, Suphanburi 1 and Phathumthani 1 cultivars with the grain yields of 2.34, 2.25, 1.99, 1.98, and 1.82 t ha-1, respectively.