THE INFLUENCE OF FERTILIZERS, NaHCO_3,SOIL TYPE ON CHEMISTRY OF FLOODED SOILS AND RICE PLANT GROWTH

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 NaHCOsand fertilizer treatments on flooded soils to the 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. The first factor was two kind of soils Fluvaquent and Calciquert, the factor was without nutrient （ blank ）, macro nutrients, and completely nutrients （second macro and micro nutrients） , and the third factor was 0 mg/kg, 200 mg/kg and 400 mg/kg of NaHCO3 or equivalent with 0 mg, 1 200 mg and 2 400 mg NaHCO3 per pot. Each experimental unit used a pot of 10 L capacity and filled with soil mud equivalent with 6 kg of dried soil. After each of treatment combination mixed into the mud soil, two plants of IR - 32 variety were grown, and flooded at 5 cm high accordingly with growth period. Parameters observed were the growth of tillers, electrical conductivity （ E. C. ） and pH. The experiment results showed that the treatment of NaHCO3 increased the soluble salt content （E. C. ） and soil acidity （ pH ） during flooding on Calciquerts and Fluvaquents. The content of soluble salt decreased to 2.0 mmhos/cm, while pH on Calciquert decreased towards the neutral pH. Anyhow the pH on Fluvaquents increased approach to neutral. The treatments of NaHCO3 inhibited the tiller growth, either macro fertilizer and completely fertilizer increased the tillers, but did not improve the negative effect of alkalinity due to of NaHCO3 treatment.