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MICRO NUTRIENTS: 1. Iron 0.1%:Source: It is absorbed as ferrous 〖Fe〗^(2+) and ferric 〖Fe〗^(3+) ions. It is abundant in acidic soils.Functions of Iron: Essential for synthesis of chlorophyll.Constituent of electron carriers cytochrome and feridoxin.Activator of oxidizing enzymes
2. Manganese: 0.005%. Source: it is absorbed as 〖Mn〗^(2+) Functions of Manganese: 1 Activator of enzymes of photosynthesis & respiration 2 It is involved in photosynthetic split of water. Deficiency symptoms of Manganese: 1 Interveinal chlorosis 2 Necrotic spots.
3. Zinc: 0.002%. Source: soil as 〖Zn〗^(2+) Functions: Involved in synthesis of 1AA. Activation of more than 80 enzymes. Deficiency symptoms: 1 Interveinal chlorosis followed by necrosis.2 Leaves are distorted, smaller sized and cluster as rosettes. Zinc deficiency is known as little leaf disease.
4. Copper: 0.0006% Source: Copper is absorbed as 〖Cu〗^(2+)
Functions of Copper: 1 Constituent of several oxidizing enzymes 2 Constituent of plastocyanin Deficiency symptoms of Copper: Necrosis -- leaves look withered. Wilting even when water is supplied. Exanthema of fruit trees. Die back of Citrus. Reclamation in Cereals.The parts of the plants that show deficiency symptoms also depend on the mobility of the element in the plant. For elements that are actively mobilized within the plants and exported to young developing tissues, the deficiency symptom tend to appear first in the older tissue. For example the deficiency of symptoms of Nitrogen, Potassium and Magnesium are visible first in the senescent leaves.The deficiency symptoms tend to appear first in the young tissue whenever the elements are relatively immobile and are not transported out of the mature organs. Example: elements like Silicon, Calcium are a part of the structural component of the cell and hence are not easily released. This aspect of mineral nutrition of plants is of great significance and importance to agriculture and horticulture.
5. Molybdenum: It is present in minute quantity 0.00001%. Source: soil, in the form of Molybdale Mo 04- Functions: Role in nitrogen fixation Activator & nitrate reeducate
Deficiency symptoms: Interveinal chlorosis followed by necrosis. Young leaves become twisted. Whip tail disease of crucifers.

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