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Manganese

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Manganese is one of the most important micronutrients and plays many key roles within plants. Sometimes called “The Nutrient of Life,” manganese is essential for photosynthesis, development of reproductive structures, disease resistance, and more.

While corn responds well to zinc, crops like wheat and soybeans really depend on manganese. Manganese is critical for chlorophyll development, and deficiency often shows up on new growth as interveinal yellowing, which can look similar to iron deficiency. That’s why tissue testing is important to tell the difference.

Manganese supports chlorophyll production, respiration, and helps improve plant standability or stock strength. It also plays a role in seedling emergence by accelerating germination and helping the plant get off to a strong start. Manganese is most available in soils with pH between 5.5 and 6.5. In soils high in organic matter or muck soils, availability is limited, especially when cation exchange capacity (CEC) is very high and organic matter is above 10%. In these cases, multiple applications of manganese may be needed to meet crop demands.

Soil tests should show manganese levels between 10 and 20 parts per million, with iron levels higher than manganese, usually between 20 and 40 parts per million. Manganese often works best when applied together with other micronutrients like iron and sulfur because they act in synergy.

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