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Molybdenum Deficiency



P_molybdenum

Molybdenum Deficiency

Usually appear in

Spring to Summer


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Caused By:-     Usually Acidic Soils

Description

Molybdenum deficiency is very rare as it is a micro-nutrient and only needed in minute quantities. Nevertheless when it is deficient it causes problems in many plants especially Brassicas where it causes whiptail and citrus where it causes Yellow spot.
Other crops that are easily affected are tomato,potato,Lettuce,spinach,celery and beet.
Molybdenum deficiency is more often on acidic soils especially where sulphates are used. Phosphorus and sulfur are often deficient under the same conditions that bring about Molybdenum deficiency. In this case adding Molybdenum will produce a negative crop response until the phosphorus or sulfate levels are increase.
It is believed that Molybdenum acts as a catalyst which is involved in the nitrogen usage processes in the plant. This might also cause Molybdenum deficiencies in grazing animals which feed on these plants.
Molvbdenum-deficient plants are stunted, often missing parts of leaves on the edges or in the leaf, narrow upwardly curled leaves from the midrib, poor or no heart formation in brassicas and have varying shade of yellow discolouration which closely resembles nitrogen deficiency.
See also BORON DEFICIENCY, CALCIUM DEFICIENCY, IRON DEFICIENCY, MAGNESIUM DEFICIENCY, MANGANESE DEFICIENCY, NITROGEN DEFICIENCY, PEAR BORON DEFICIENCY, PHOSPHORUS DEFICIENCY, POTASSIUM DEFICIENCY.


Control

Foliar feeding with molybdenum salts is usually sufficient to satisfy most plants needs. Usually most compound fertilisers have trace elements of Molybdenum which is sufficient for foliar feeding.
Applying lime to acid soils usually increases the availability of molybdenum.



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