January 18, 2024 8:00 am Published by KirstyH

These beautiful roses, grown in Ecuador, benefited from applications of OMEX Sulphomex and OMEX SW8

Why Sulphur plays a vital role

Form – taken up as ionic Sulphate SO4-, Sulphur links with Nitrogen to build protein and promote canopy development.

Function – while Nitrogen is a growth promoter, Sulphur is a growth regulator, effectively balancing the manufacture of sugars and proteins in leaf tissue with the demand from these materials throughout the plant. As such, Sulphur plays a central role in maintaining green leaf area, growth rates and delaying senescence. Low Sulphur status reduces Nitrogen metabolism, leaf expansion and plant development

Symptoms – similar in appearance to Nitrogen stress, low Sulphur status induces a pale yellow chlorosis of the entire plant. Plants produce smaller leaves with lower chlorophyll and slower growth rates. Low Sulphur status can lead to elevated leaf concentrations of free Nitrogen, which can increase insect and disease pressure.

Significance – as mobility within the soil is very high, Sulphur demand is not often met without supplementation. Low Sulphur status will restrict plant response to Nitrogen, influencing growth rates, senescence and disease resistance. Sulphur stress is often worse in cold, wet, compacted soils.

Actions –  check soil status and correct if necessary. Apply Sulphur with Nitrogen fertiliser. Foliar feed Sulphur during times of rapid growth, peak stress or high disease pressure.

OMEX Solutions

Omex Sulphomex is a clear solution containing water soluble sulphur and nitrogen. Crops will respond immediately to applications of Omex Sulphomex and it will be rapidly absorbed by the plant.

Omex Sulphomex will supply the sulphur requirements for all crops and its use will avoid the unpleasant dust and caking characteristics of many elemental products

Omex SW8 is a silicon based wetter, designed to give enhanced uptake of foliar nutrients. In addition, when used at higher rates, it also supplies silicon to the crop. This can have a secondary effect of deterrence, which may affect a variety of pests such as aphids, red spider mite, thrips and whitefly.

The silicon-oxygen bonds are hydrophobic and the organic clusters are hydrophilic, creating a superior wetting agent, which spreads quickly to cover a large surface area – greater than conventional surfactants. Microscopic examination reveals a high degree of stomatal flooding may also occur which can extend into the intercellular spaces.


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