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

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.