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Rubber
Magnesium and sulphur
| Required for: |
Compatibility between root stocks and clone, growth and dry matter production of young trees, girth and latex formation
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| High deficiency risk: |
Mg: |
On highly weathered Ulti- and Oxisols with low pH and low base saturation
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S: |
Soils with low organic matter status and high Fe and Al- oxide contents.
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| Deficiency symptoms: |
Mg: |
Yellowing of leaves which are partly reduced in size
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S: |
Stunted tree growth, pale green appearance of the canopy
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| Optimal leaf concentrations |
Mg: |
0.20-0.25%
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| Recommendations: |
Immature trees receive 100-200 g of Kieserite per year to encourage girth growth and canopy formation. In mature trees, which are in a steady state, nutrients are recycled between canopy and soil, and where leaching and runoff are minimized, application can be reduced to 40 - 60 g Kieserite/tree/year. |
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Mg deficiency leads to chlorotic and generally smaller rubber leaves.
A young rubber tree established on a soil with a low organic matter content, suffering from S deficiency.
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