AMMONIUM FIXATION IN NIGERIAN SOILS

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Abstract
Clay minerals in 32 representative Nigerian [Africa] soil samples were identified by X-ray diffraction techniques to be mainly kaolinitic, but appreciable amounts of 2:1 lattice layer minerals were also present. In 6 soils that contained either large amounts of native fixed ammonium or showed medium to high ammonium-fixing capacity, 2:1 type clay minerals were predominant and the cation exchange capacity was usually higher than 10 me/100 g. Most clay minerals were present as intergradients or interstratifications. Montmorillonite and illite were found mainly in poorly drained or seasonally flooded soils.

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