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Citrus
Magnesium
| Required for: |
Photosynthesis, yield, fruit size, sugar content
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| High deficiency risk: |
Light soils, high rainfall levels, soils that receive large amounts of NH4+, K+, Ca2+
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| Deficiency symptoms: |
Yellowing of the leaves with an inverted “V” of green tissue at the base of the leaf
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| Optimal leaf concentrations: |
Mg: |
0.12-0.25%
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S: |
0.21-0.40%
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| Recommendations: |
Fertilizer recommendation is based on tree age and fruit yield. For young, immature trees (< 1 year) 200 g per tree of Kieserite are applied to soils with a medium Mg supply, whereas 600 g are applied on soils with a poor Mg status. Acid soils (humid climates) or calcareous soils (dry climate) should receive 600 g Kieserite per tree per year. For mature trees the same applies and rates vary between 600 and 1800 g per tree per year.
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 Mg deficiency in citrus occurs as intercostal leaf chlorosis.
 S deficient lemon tree with yellowing of youngest leaves including veins.
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