Manganese (Mn)

Managanese is preferentially absorbed by plants as the Mn2+ ion from the soil solution and serves primarily as an activator for enzymes that are involved in a variety of plant metabolic functions including respiration, amino acid synthesis and lignin synthesis.

As an immobile plant nutrient, Mn deficiency is observed in the new developing tissue of the plant similar to that of Fe and Zn. Most deficiencies have occurred on high pH soils with interveinal chlorosis as the first symptom to appear. On highly weathered and low pH soils, Mn toxicity can also become a problem. Leaf crinkling of the new growth is a symptom of Mn toxicity in both cotton and soybeans.

Fertilization of Mn is rarely done as soils typically provide sufficient quantities for normal plant growth and development. Most Mn problems occur at low and high soil pH levels or on poorly drained soils.

Images of Manganese deficiency symptoms

Manganese deficiency symptoms on soybean.