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The objective of this work is to neutralize the effect of exchangeable acidity of a ULTISOL RED YELLOW dystrophic incubated with application of increasing doses of CaCO 3 . This work was performed at the Laboratory of Soil Science UEMA / CESI . Soil samples were collected in a ULTISOL RED YELLOW dystrophic in Exhibition Park of Imperatriz/MA , at 0-20 cm depth . After collecting the samples , they were carried to the laboratory , air-dried , then broken , passed through a sieve of 2 mm mesh size and homogenized and sample for chemical analysis routine . Soil samples were placed hatching increasing doses of calcium carbonate equivalent to 0 , 1 , 2 , 3 , 4 , 5 , 8 and 10 t / ha ( CaCO 3 ), with ten repetitions , in a completely randomized design. After 30 days the start of incubation was taken from each experimental samples to determine the pH in water and CaCl 2 in order to perform the comparison and correlation of these methods to study the soil . Significant difference between the pH values ??and between the methods used in determining and intense mineralization of organic matter . KEYWORDS: calcium chloride , correlation, water.

DETERMINAÇÃO DO pH DE UM ARGISSOLO VERMELHO AMARELO distrófico INCUBADO COM APLICAÇÃO DE DOSES CRESCENTES DE CaCO3 POR DIFERENTES MÉTODOS