This research was conducted to study the influence of NaHCO3and fertilizer treatments on flooded soils tothe chemistry of soil and rice plant growth.The experiment was done in a greenhouse using a split-split plot design ofthree factors: two types of soil,three doses of fertilizers and three levels of NaHCO3with three replications.The firstfactor was two kind of soils Fluvaquent and Calciquert,the factor was without nutrient(blank),macro nutrients,andcompletely nutrients(second macro and micro nutrients),and the third factor was 0 mg/kg,200 mg/kg and 400 mg/kgof NaHCO3or equivalent with 0 mg,1 200 mg and 2 400 mg NaHCO3per pot.Each experimental unit used a pot of 10L capacity and filled with soil mud equivalent with 6 kg of dried soil.After each of treatment combination mixed into themud soil,two plants of IR-32 variety were grown,and flooded at5 cm high accordingly with growth period.Parametersobserved were the growth of tillers,electrical conductivity(E.C.) and pH.The experiment results showed that the treatment of NaHCO3increased the soluble salt content(E.C.) and soilacidity(pH) during flooding on Calciquerts and Fluvaquents.The content of soluble salt decreased to 2.0 mmhos/cm,while pHon Calciquert decreased towards the neutral pH.Anyhowthe pHon Fluvaquents increased approach to neutral.The treatments of NaHCO3inhibited the tiller growth,either macro fertilizer and completely fertilizer increased thetillers,but did not improve the negative effect of alkalinity due to of NaHCOtreatment. This research was conducted to study the influence of NaHCO3 and fertilizer treatments on flooded soils tothe chemistry of soil and rice plant growth. The experiment was done in a greenhouse using a split-split plot design of three factors: two types of soil, three doses of fertilizers and three levels of NaHCO3 with three replications. first factor was two kind of soils Fluvaquent and Calciquert, the factor was without nutrient (blank), macro nutrients, and completely clear nutrients (second macro and micro nutrients), and the third factor was 0 mg / kg , 200 mg / kg and 400 mg / kg of NaHCO3or equivalent with 0 mg, 1 200 mg and 2 400 mg NaHCO3per pots. Each experimental unit used a pot of 10 L capacity and filled with soil mud equivalents with 6 kg of dried soil. After each of treatment combination mixed into themud soil, two plants of IR-32 variety were grown, and flooded at5 cm high accordingly with growth period. Parametricobserved were the growth of tillers, electrical conductivity (EC) and pH.The experiment resu lts showed that the treatment of NaHCO3increased the soluble salt content (EC) and soilacidity (pH) during flooding on Calciquerts and Fluvaquents. The content of soluble salt decreased to 2.0 mmhos / cm, while pHon Calciquert towards towards neutral neutral pH. Anyhowthe pHon Fluvaquents increased approach to neutral.The treatments of NaHCO3inhibited the tiller growth, either macro fertilizer and completely fertilizer increased thetillers, but did not improve the negative effect of alkalinity due to of NaHCOtreatment.