Mineralogical composition of the clay fraction in acid brown forest soils under tea plantations subjected to the long-term mineral fertilization in Russian subtropics

Autor:	N. V. Kozlova, L. S. Malyukova, T. A. Sokolova, T. Ya. Dronova
Rok vydání:	2008
Předmět:	Mineral Potassium chemistry.chemical_element Soil science engineering.material complex mixtures chemistry.chemical_compound Montmorillonite chemistry Environmental chemistry Soil water Illite medicine engineering Swelling medicine.symptom Clay minerals Quartz Geology
Zdroj:	Moscow University Soil Science Bulletin. 63:154-159
ISSN:	1934-7928 0147-6874
DOI:	10.3103/s0147687408040029
Popis:	Swelling minerals of the montmorillonite group predominate in the clay fraction of acid brown forest soils under tea plantations; illite and quartz are present in smaller amounts; small amounts of chlorite-like structures are also found. A decrease in the content of swelling mineral and a deterioration of their crystallization degree (especially in the upper horizons) take place upon the long-term application of mineral fertilizers at high rates; also, the accumulation of illite takes place. These processes attest to the beginning of degradation and/or removal of montmorillonite minerals (the most finely dispersed and hydrophilic clay minerals) under the impact of a significant decrease in pH because of the high rates of physiologically acid fertilizers in combination with illitization under the impact of potassium application.
Databáze:	OpenAIRE
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