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Sugar beet
Magnesium and sulphur
| Required for: |
Yield, photosynthesis, sugar formation in root
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| High deficiency risk: |
Mg: |
Sandy soils, alkaline soils, soils that receive large amounts of NH4+, K+
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S: |
Soils low in organic matter content, use of S- free fertilizers, low sulphur deposition
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| Deficiency symptoms: |
Mg: |
Discolouration begins at leaf margins and tips, on younger leaves whitish spots with brown margins between veins, older leaves show interveinal chlorosis, stunted growth
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S: |
Reduced shoot growth with pale green appearance
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| Optimal leaf concentrations |
Mg: |
0.30-0.70% |
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S: |
500-1400 mg/kg SO4 |
| Recommendations: |
For yields > 30 t/ha 170 – 240 kg Kie-serite/ha are recommended as mainte-nance dressing on fertility class C soils. On poorer soils (class A) 1.5-2.0 times that amount is required. Kieserite is broadcast pre-sowing. Peak demands are supplied by 3-5% Epsom Salt solution to the foliage at the interrow leaf cover stage. |
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Mg deficiency symptoms occur on the older leaves as interveinal chlorosis.
Sugar beet with S deficiency shows stunted growth and chlorosis of younger leaves.
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