Clay minerals in bulgarian chromic luvisoil and their grouping according to the mineralogical composition
1998
Boneva, K. (Institut po Pochvoznanie i Agroekologiya "N. Pushkarov", Sofia (Bulgaria))
Twenty two chromic luvisoils profiles from South Bulgaria are included in the study. Clay minerals in the clay fraction (particles 0.001 mm) of the genetic horizons are determined with x-ray diffraction analysis and transitional electronic microscopy. The clay minerals have been estimated as a percentage of the clay fraction and of the soil and have been statistically analysed (Boneva K. et al., 1995). On the basis of the Scheme for grouping of soils according to the content and composition of clay minerals. Al horizon of the chromic luvisoils can be assigned to class II with 14.55% montmorillonite in the soil and group and subgroup MIK with 5.67% illite and 4.78% kaolinite. Bt horizon resembles that of the vertisoils having more thatn 20% montmorillonite in the soil.
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