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Coffee
Magnesium and sulphur
| Required for: |
Yield, quality (formation of caffeine)
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| High deficiency risk: |
Mg: |
Acid strongly weathered soils, e.g. Ulti-and Oxisols
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S: |
Soils with low organic matter content, high Al and Fe oxides
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| Deficiency symptoms: |
Mg: |
Chlorosis of the leaf blades between the veins
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S: |
Reduced leaf size and yellowing of the younger leaves
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| Optimal leaf concentrations: |
Mg: |
0.30-0.40% (tip of bearing branches)
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S: |
0.20-0.30%
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| Recommendations: |
100 – 120 kg Kieserite/ha as maintenance dressing at an adequate supply level. Soils with low Mg supply (fertility class A) should receive 1.5-2.0 times that amount. Application on light soils should be prior to the main uptake. Top-dressing by foliar Epsom Salt solutios (5%) is recommended to supply peak demand, especially under dry conditions. |
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Coffee leaves with pronounced magnesium deficiency.
Initial (left) and advanced stage (right) of sulphur deficiency in coffee.
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