Manganese deficiency 157884 220477452 2008-06-20T01:33:45Z Earthdirt 3512837 add nav box and cat {{otheruses4|manganese deficiency in plants|the same deficiency in humans (ICD10 code E61.3)|manganese deficiency (medicine)}} '''Manganese (Mn) deficiency''' is a plant disorder that is often confused with, and occurs with, [[Iron deficiency (plant disorder)|iron deficiency]]. Most common in poorly drained soils, also where organic matter levels are high. [[Manganese]] may be unavailable to plants where [[Soil pH|pH]] is high. Affected plants include [[onion]], [[Apple (fruit)|apple]], [[pea]]s, [[French bean]]s, [[cherry]] and [[raspberry]], and symptoms include yellowing of leaves with smallest leaf veins remaining green to produce a ‘chequered’ effect. The plant may seem to grow away from the problem so that younger leaves may appear to be unaffected. Brown spots may appear on leaf surfaces, and severely affected leaves turn brown and wither. Prevention can be achieved by improving [[soil structure]]. Do not over-lime. {{PlantMineralDeficiency}} [[Category:Physiological plant disorders]] {{plant-disease-stub}}