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MICRO – NUTRIENTS
Sources of iron.
Importance of iron.
Un availability of iron to plants may be caused by:-
Deficiency of iron
Severe chlorosis especially in young leaves.
Originates from weathering of rocks.
High acidity toxicity
High alkalinity deficiency.
Importance of manganese
Deficiency of manganese
Zinc is essential for the normal healthy growth and reproduction of plants, animals and humans and when the supply of plant-available zinc is inadequate, crop yields are reduced and the quality of crop products is frequently impaired.
Released from weathering and farm yard manure.
Importance of Zinc
Deficiency of Zinc
Excess zinc is toxic
Copper (Cu) is an essential nutrient for plant growth, but because only a small amount is needed, it is classified as a micronutrient. Most Minnesota soils contain adequate amounts of this nutrient for optimum crop yields.
Organic or peat soils are exceptions and Cu might be needed in a fertilizer program when small grains are grown on these soils. Wheat is the most sensitive to Cu deficiency. Although barley and oat crops are less sensitive, Cu use will increase their yield when grown on organic soils.
Available from weathered minerals especially in acidic soils.
Importance of copper.
Deffiency of copper
Excess copper toxic
Boron is an essential micronutrient for growth and development of healthy plants. In small concentrations boron compounds are used as micronutrients in fertilizers, in large concentrations they are used as herbicides, algaecides and other pesticides.
Release during rock weathering
Accumulates in organic matter.
Importance of Born
Defficiency of Boron
Importance of molybdernium.
Associated with nitrogen deficiency and its symptoms.
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