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Apple
Magnesium and sulphur
| Required for: |
Photosynthesis, yield, fruit size, sugar: acid ratio, colouration, taste
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| High deficiency risk: |
Mg: |
Sandy soils, soils that receive large amounts of NH4+, K+, Ca2+
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S: |
Eroded soils in hilly areas, poor in OM content and far from industrial, S emitting areas
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| Deficiency symptoms: |
Mg: |
Fading of the green colour at the terminals of older leaves than yellow, rusty brown interveinal mottling (fishbone pattern), premature leaf fall
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S: |
Leaves appear uniformly pale to whitish green.
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| Optimal leaf concentrations: |
Mg: |
0.21-0.25%
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S: |
0.20-0.40%
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| Recommendations: |
100 kg Kieserite/ha are recommended to soils with adequate supply (fertility class C). For Mg poor, acidic soils or soils rich in CaCO3 1.5-2.0 times larger amounts may be required. Kieserite application can be combined with P and K fertilizers during the winter resting period.
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Typical interveinal chlorosis of apple leaves, indicating severe magnesium defiency.
Optimum magnesium supply to apples guarantees ideal colour formation, tasty and aromatic fruits.
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