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EC number: 211-334-3
CAS number: 638-38-0
Mean manganese concentrations in
bird´s eggs from a variety of geographical areas range from 1 to5 mg/kg
dry weight, mean liver concentrations range from 3 to 11 mg/kg dry
weight, and mean feather concentrations reach from 0.3 to 40 mg/kg dry
weight. Mean manganese concentrations of up to 17 mg/kg dry weight have
been found in tissues (liver, kidney and whole body) from a variety of
reptiles and wild mammals.
Manganese is an essential nutrient for
micro-organisms, plants and animals. Nutritional manganese requirements
for terrestrial plants are around 10 - 50 mg/kg tissue. Critical
nutritional levers vary widely between species and among cultivars of a
species. Calcareous soils, especially those with poor drainage and high
organic matter, are the types of soils that produce manganese deficient
plants. Symptoms of manganese plants vary widely with species and
include marginal chloroses, necrotic lesions and distorted development
of the leaves. Toxic manganese concentrations in crop plant tissue vary
widely, with critical values ranging from 100 to 5,000 mg/kg. Manganese
toxicity is a major factor limiting crop growth on acidic, poorly
drained, or steam-sterilized mineral soils. There is a wide range of
variation in tolerance to manganese between and within plant species.
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