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Symptoms of Manganese Deficiency in Cereal Grains

Manganese is immobile in the plant, so its deficiency appears as reduced or stunted growth with interveinal chlorosis on younger leaves. Cereal grains can develop gray spots on their lower leaves, and legumes can develop necrotic areas on their cotyledons. Soybeans and potatoes commonly show interveinal chlorosis on the upper leaves while veins remain green. Leaves become pale-green first, then pale-yellow. Brown, dead areas appear as the deficiency becomes acute.

Manganese Deficiency: Gray spots on lower leaves

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Manganese functions primarily as part of a plant’s enzyme system. It has a role in several metabolic reactions including the conversion of Nitrate Nitrogen to a form the plant can use. It plays a direct role in photosynthesis by aiding chlorophyll synthesis. Deficiencies often occur in high organic matter soils with neutral to alkaline pH and on those soils that are naturally low in Manganese.

Necessary for the formation of sugars and starches
Aids in Nitrogen utilization and assimilation
Aids in chlorophyll synthesis

High pH
Organic conditions
Prolonged cold periods

Symptoms of Manganese Deficiency in Cereal Grains

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About Manganese

Functions of Manganese

Manganese Deficiency is Made Worse By:

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