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Coconut
Magnesium and sulphur
| Required for: |
Improved growth, copra production
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| High deficiency risk: |
Mg: |
Infertile soils, Mg depleted soils, poorly aerated soils, e.g. waterlogged areas
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S: |
Sandy soils with low organic matter content, in areas far from the coast
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| Deficiency symptoms: |
Mg: |
Broad yellow bands along the outer margin of the oldest leaves, the centre of the affected leaves remains distinctly green
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S: |
Yellowish green or yellowish orange colour of leaflets, than complete chlorosis and necrosis, reduced leaf size
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| Optimal leaf concentrations: |
Mg: |
0.30-0.35% (frond 14) |
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S: |
0.17-0.20% (frond 14) |
| Recommendations: |
500 g Kieserite/palm/year should be applied in a circle around the trunk at the onset of the rainy season. For highly productive commercial plantations up to 1 kg of Kieserite per palm per year is recommended. |
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Yellow upper parts of leaflets and green bases as typical signs for Mg deficiency in coconut.
The most severe form of sulphur deficiency.
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