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Maize
Magnesium and sulphur
| Required for: |
Photosynthesis, yield, starch and protein formation
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| High deficiency risk: |
Mg: |
Heavily limed soils, acid soils, soils that receive large amounts of NH4+, K+
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S: |
Soils with a low OM status, poor microbial activity, low atmospheric S deposition
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| Deficiency symptoms: |
Mg: |
Interveinal chlorosis, leaf tissue turns yellow and dies, incompletely filled cobs
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S: |
Yellowing of the whole plant, stunted growth comparable to N deficiency
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| Leaf concentrations |
Mg: |
0.21-0.40% |
| (adequate supply) |
S: |
0.20-0.30% |
| Recommendations: |
100 – 120 kg Kieserite/ha as maintenance dressing at adequate supply. Soils with low Mg supply (fertility class A) should receive 1.5-2.0 times that amount. Application on light soils should be prior to the main uptake period. Top-dressing by foliar Epsom Salt solutions (5%) is recommended to supply peak demand, especially under dry conditions. |
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Mg deficiency occurs as yellowish white striping between veins.
Severe S deficiency leads to a reduced number of kernels per cob.
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