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Soybean
Magnesium and sulphur
| Required for: |
Yield, root nodulation, oil content of the seed
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| High deficiency risk: |
Mg: |
Sandy soils, acid soils, cool wet conditions, Al toxicity in the soil
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S: |
Weathered soils, low in organic matter with poor microbial activity
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| Deficiency symptoms: |
Mg: |
Pale green lower leaves whit-ish/yellow mottled interveinal tissue, which later looks speckled bronze
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S: |
Stunted growth, pale green leaves, chlorosis especially on upper leaves
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| Optimal leaf concentrations |
Mg: |
0.23-0.55% |
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S: |
0.16-0.20% |
| Recommendations: |
For yields of 3 t/ha,120 – 180 kg Kieserite/ha as maintenance dressing to none Mg deficient soils. 1.5 – 2.0 times higher rates are required on deficient soils. Pre-plant broadcast Kieserite can be supplemented with 5% Epsom Salt foliar sprays. |
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Interveinal chlorosis turning into necrosis under severe Mg deficiency.
An adequate supply of Mg and S is essential for achieving a high yield and good quality.
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