Mineral Nutrition Test - 7

Most of the prokaryotic nitrogen fixing prokaryotes are symbiotic in nature. Azatobacter is a bacteria which is non-symbiotic nitrogen fixing prokaryote.

Micronutrients are required in very small quantity. The main role of micronutrients is to act as cofactor of enzyme. Co-factors increase the efficiency of enzymes.

Deficiency of elements in plants manifest as symptoms like chlorosis, necrosis, scorched leaf tips etc. smaller fruit size is not a deficiency symptoms.

Manganese deficiency in Oat appear as grey spots on leaves of oat. Rate of photosynthesis is also influenced by the Manganese elements.

Sulphur is an important nutrient for optimum growth and productivity of pulse crops, because sulphur is important in protein synthesis of plants.

Justus von Liebig's Law of the Minimum states that yield is proportional to the amount of the most limiting nutrient, whichever nutrient it may be.

From this, it may be inferred that if the deficient nutrient is supplied, yields may be improved to the point that some other nutrient is needed in greater quantity than the soil can provide, and the Law of the Minimum would apply in turn to that nutrient.

Dark brown amorphous substance formed by degradation of cellulose and lignin in the soil to increase water holding capacity and aeration is humus. It also increase fertility of the soil.

Main function of Nickel ions in leaves and root is metabolism of urea and ureides to form amino acids and protein in plant body.

Nitrogen-fixing bacteria, especially roots of legumes, can fix this atmospheric nitrogen into biologically usable forms.

Plants obtain it in the form of molybdate ions. It is a component of several enzymes, including nitrogenase and nitrate reductase both of which participate in nitrogen metabolism.