FIXED AMMONIUM AND CARBON-NITROGEN RATIOS OF SOME TRINIDAD SOILS

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Abstract
The fixed NH4-N and C/N ratios of soil profiles from Maracas, McBean and Tarouba series of Trinidad were studied. From 19 to 77% of total soil N was present as fixed NH4-N. The higher percentage of fixed NH4-N was obtained at the lower depths (70-100 cm). Organic C/total N ratios varied from 9.5 in the surface soil to 1.2 at lower depth (70-100 cm). Organic C/organic N ratios varied much less with depth (from 12.3 to 7.9), except in soils at the lowest depth (70-100 cm). This was due to incomplete extraction of fixed NH4-N from the soil samples at lower depths. The clay fraction contributed the maximum amount of fixed NH4-N in all soils. In Maracas series, silt and sand fractions also contained a considerable amount of fixed NH4-N.

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