Frequently Asked Questions (FAQs)

Q. If I convert to liquid nitrogen, will it damage my farm sprayer?

A. OMEX solution fertilisers can be applied through any sprayer without damage to pumps, pipework, seals, paintwork etc. The only thing you need to convert your sprayer into an extremely accurate fertiliser spreader is to fit a different set of jets.

Q.  I already have a machine and farm labour, so why do I have to use a contractor to apply suspension fertilisers?

A.  Suspensions are tailor made to exact field and crop requirements, and offer many benefits in terms of accuracy, uniformity and yield.  The nutrients are suspended in a clay based material that resembles a thick emulsion paint, which is too viscous to be compatible with most farmer’s own machinery.

Many customers prefer the contractor service because they don't need to organise logistics and farm labour can be more efficiently used on other important duties during the busier times of the season that fertilisers are usually applied in.

Q.  How and when do I apply foliar fertilisers?

A  Foliar fertilisers are usually sprayed on to the leaves of growing crops using existing farm sprayers.  The timing depends on the product and crop, and can be from early emergence to just before harvest, as part of a nutrition plan, or just when the crop needs help during stress or deficiency. 

Some foliar products can be tank mixed with other products to save separate passes, but you must check the compatibility first.

Q. What about storing liquid fertiliser on farm and do the tanks need bunding?

A. OMEX offer a storage tank service and can advise on siting requirements. OMEX company policy requires tanks to be bunded.

Q. What about scorch?

A. It is possible to see scorch occasionally following top-dressing with liquid nitrogen, but it is a temporary effect and has no effect on yield potential etc. By taking some simple precautions it is possible to reduce the risk. Avoid application on damp crops, in very windy conditions and shortly after application of crop protection chemicals.

Q. Are liquids more expensive than solid fertiliser?

A. Liquid nitrogen leads to significant labour and efficiency savings, and the accuracy and advanced formulation of liquid nitrogen often leads to better yields with liquids. In practice, however, liquid nitrogen is often slightly cheaper than UK manufactured ammonium nitrate.

Q. What is meant by specific gravity and what application volumes are involved?

A. The specific gravity (SG) of a product (also known as the density) is the weight of the material compared to water and application volumes are surprisingly low. A product with an SG of 1.3 weighs 1.3 times the weight of water. To convert an application rate in kg/ha to litres per hectare you simply divide by the SG of the product. 

Q. What are the advantages of liquid fertiliser over solid fertiliser?

A. The reason farmers are switching to liquids include improved application accuracy, simple handling, wide working widths, full application rate up to field margin, no fertiliser application in buffer zones, improved yields, higher work rates; increased profits.