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Manganese Deficiency



P_manganesedif

Manganese Deficiency

Usually appear in

Spring to Autumn.


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Caused By:-     Too Alkaline Soil Conditions

Description

Very difficult to diagnose since it resembles to iron deficiency. Chlorosis is most severe at the top of the plant. Yellowing of the leaves appears first near leaf margins and develops in a V-shaped pattern. Leaves then develop a tan or gray spots that can easily be mistaken for air pollution damage. These spots are the major difference between manganese and iron deficiency. The effects of manganese deficiency is not a pest as such, but is a symptom that there is something wrong, usually with soil nutrients. It can occur on trees and shrubs, as well as on many herbaceous plants. It can easily be mistaken for iron deficiency, but in iron deficiency the younger leaves are mostly affected unlike in manganese deficiency all leaves are usually affected as manganese is transported from older leaves. All plants need manganese for the production of chlorophyll hence the the effect of yellowing of the leaves(chlorosis) first near leaf margins and develops in a V-shaped pattern. Leaves then develop a tan or gray spots that can easily be mistaken for air pollution damage. These spots are the major difference between manganese and iron deficiency. The leaf veins are usually greener, including the smallest ones, and the last part of the leaves to go yellow. Severely affected foliage may develop scorching at the leaf edges. In the latter stages of manganese deficiency the leaves begin to curl. Manganese deficiency is more often found where soils are highly alkaline or poorly drained soils even if there is plenty of organic matter in the soil. The ideal ph for growing plants is a ph between 5 and 6.5.
Picture by R.J. Reynolds Tobacco Company Slide Set, R.J. Reynolds Tobacco Company, Bugwood.org.
See also BORON DEFICIENCY, CALCIUM DEFICIENCY, IRON DEFICIENCY, MAGNESIUM DEFICIENCY, MOLYBDENUM DEFICIENCY, NITROGEN DEFICIENCY, PEAR BORON DEFICIENCY, PHOSPHORUS DEFICIENCY, POTASSIUM DEFICIENCY.


Control

Manganese sulphate fertilisers, along with chelated forms of these micronutrients, can be used to correct the deficiency. It can also be sprayed as a foliar feed. Care must be taken not to over feed manganese as in higher quantities it can also be toxic producing symptoms similar to the deficiency. Preventing the soil from becoming too alkaline will release manganese for the plant to uptake.


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