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FERTILIZERS
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Primary Plant Nutrients
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May not be available in soil
in sufficient quantities for optimum development and yield and hence annual
application necessary. Nitrogen (N) promotes quantity and speed of leaf
growth. Phosphate (P2O5) promotes root growth. Potash
(K2O) promotes vigour, helps metabolism, imparts resistance.
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Secondary Plant Nutrients
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Calcium (Ca) usually available
in soil. Magnesium (Mg) promotes health and growth. Foliar application
in high yielding teas. Sulphur (S) getting depleted in tea soils, hence
need for soil application in well drained teas.
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Micronutrients
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Promote normal health. Boron
(B), Manganese (Mn), Molybdenum (Mo) and Zinc (Zn) show promise. Zinc
to be used at the rate of 12.5 kg/ha/year as foliar spray.
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Deficiency symptoms
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| N |
Pale or yellow
colour , slow growth, fewer shoots, small leaves |
| P2O5 |
Dull, small leaves,
weak stem, slow development. |
| K2O |
Thin white stem,
folded small leaves, poor recovery from prune or drought, fair central
growth with poor side branches. |
| Ca |
When pH value
below 4. |
| Mg |
When pH value
below 4, also in droughty condition depicted by interveinal chlorosis
as inverted 'V'. |
| S |
Yellowing of
upper leaves. |
| Trace Elements |
Discoloured leaves,
curly leaf edges and stunted growth. |
| Zn |
Sickle shaped
leaves. |
| B |
Rosetting of
new growth. |
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