Justify giving two reason how excess of manganese in soil induce deficiencies of iron, magnesium and calcium
Answers
Manganese competes with iron and magnesium for uptake and with magnesium for binding with enzymes. Manganese also inhibits calcium translocation in shoot apex. Therefore, excess of manganese may, in fact, induce deficiencies of iron, magnesium and calcium. Thus, what appears as symptoms of manganese toxicity may actually be the deficiency symptoms of iron, magnesium and calcium.
Manganese in excess quantities leads to manganese toxicity and leads to deficiency of iron, magnesium and calcium in the soil.
EXPLANATION:
Manganese competes with magnesium and iron for uptake. Manganese also competes with magnesium for enzymes. Manganese also inhibits the translocation of calcium to shoot apex.
Manganese therefore results in inefficient use of iron, magnesium and calcium in the soil. With excess of manganese what appears as manganese toxicity is actually the deficiency of 'iron', 'magnesium' and 'calcium'.