Manganese (Mn) The factor that most affects manganese uptake is soil pH. Manganese intake is affected 100 times by a one-unit change in pH. For this reason, manganese uptake is very easy at appropriate pH, and manganese deficiency is observed in soils with high pH.
Manganese helps the formation of chlorophyll in the plant. It acts as a catalyst in enzymatic and physiological events in the plant. It is involved in the breakdown of carbohydrates into water and carbon dioxide and in respiratory events.
Manganese deficiency is very similar to magnesium deficiency, the difference is that the symptoms of magnesium deficiency are seen in older leaves. In manganese, it starts on young leaves.
In excess of manganese, phosphorus is reduced, preventing iron from gaining effectiveness, and iron deficiency begins to appear in the plant.
Especially in soils with high pH and high lime content, foliar application gives better results to eliminate manganese deficiency in the plant. Since manganese is not mobile in the plant, 2-3 applications are sufficient for this.
Manganese's Functions in Plants and Deficiency Symptoms It helps the formation of chloroplast together with iron. In its deficiency, chloroplast deteriorates and yellow spots are observed on the leaf blade. It is effective in the formation of chloroplastic protein. It acts as an enzyme and co-enzyme. It is necessary for the electron transfer of enzymes. Conditions that Reduce Manganese Uptake: High pH and calcareous soils. Soils with high organic matter. Hardened and overwatered airless soils. Excessive amounts of elements such as iron, zinc and copper.