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Manganese Role and Deficiency Symptom
Manganese is absorbed by plants as the Mn2+ ion. The soil Manganese availability can be decreased with cold temperature and high soil moisture and high soil pH. Manganese is a part of many plant enzymes, including some in photosynthesis. It is also required in the regulation of some plant growth hormones.
Manganese deficiency is first shown on younger leaves and in some crops yellow spotting or lesions often accompany interveinal yellowing. Beans and peas have brown areas within the seeds at maturity. Grasses have yellow spotting and streaking at the leaf base. In oats, the condition is called "gray speck". Deficiencies can be verified with plant analysis. Soil analysis is not sometimes conclusive. Environmental factors sometimes are more important than soil levels. Soil manganese extraction methods are also unreliable in high pH soils. Varieties differ widely in tolerance to low manganese availability.
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