Base saturation level

from Wikipedia, the free encyclopedia

The degree of base saturation ( abbreviation : BS value , formerly V value ) indicates the percentage of exchange sites according to the cation exchange capacity (KAK) occupied by the cations (Ca 2+ , Mg 2+ , Na + , K + ) are.

Calcium (Ca), magnesium (Mg), potassium (K) are important soil nutrients , so information about the base saturation allows conclusions to be drawn about the soil fertility . Base saturations of over 80% are optimal in mineral soils .

A base saturation of 80% means that 80% of the cation coating of the mineral and possibly existing organic exchangers of the soil consists of the ions mentioned, while 20% of the capacity is occupied by H + and Al 3+ ions.

The proportion of individual ions in the CEC is called Ca saturation, K saturation, Mg saturation, etc. There is a selectivity of the exchangers towards the different ions. The higher-valued ions (e.g. Al 3+ ) are adsorbed in preference to the lower-valued ions (e.g. K + ). The actual availability of the existing (exchangeable) cations for plant nutrition depends on the soil moisture .

See also

literature