23 December 2024
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മലയാളം
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Agriculture >
Plantation Crops > Rubber (Hevea brasiliensis)
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Crop
Management
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Nutritional disorders
Magnesium
The characteristic symptom of magnesium deficiency is the development of chlorosis
(yellowing) in the inter-veinal areas on exposed mature leaves giving rise to a
herringbone pattern. The pre-coagulation of latex on the tapping panel has been
found to be due to excessive supply of magnesium to rubber.
Potassium
The characteristic symptom is the development of marginal chlorosis, which is followed
by marginal necrosis. Only older leaves exhibit the deficiency symptoms. Size reduction
of the leaves and the absence of herringbone pattern of yellowing allow potassium
deficiency symptoms to be distinguished from those of magnesium deficiency.
Zinc
This causes interveinal chlorosis of leaves. The laminae become much reduced in
breadth in proportion to their length and the young leaflet becomes incurved towards
one another and present a hooked or claw appearance. The cause of deficiency appears
to be heavy application of phosphatic fertilizers resulting in poor availability
of zinc.
Manganese
This results in overall paleness and yellowing of the leaf with bands of green tissue
outlining the midrib and main veins.
Also, there are indications to believe that unbalanced nutrition can cause excessive
drainage of latex resulting in the dryness of trees.
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