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Agriculture > Plantation Crops > Rubber (Hevea brasiliensis)

Crop Management

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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