The study was undertaken with the object of investigating the seasonal variations in the denitrifying bacterial population and the pattern of distribution in the various horizons of red and black soils. Observations were recorded for twelve months. The data showed that there is difference in the population in red and black soils. The cyclic variation of the denitrifiers was found to be a function of the rainfail distribution over the area. The population is most concentrated in the first 30 cm of the soil profiles and decreased with increase in depth till 90 cm. Thereafter, the population did not show variation with depth.
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