Urea is a nitrogen delivering fertilizer used in a wide range of crops as a top dressing fertilizer. It is also used in blending basal blends for some crops. It is one of the cheapest forms of nitrogen, but is also not desirable because it has to be worked into the soil as some nitrogen can be lost as ammonia.
Ammonium Nitrate is a straight fertilizer which provides nitrogen to the plant during the vegetative stage when it needs it most. Nitrogen gives leaves a deep green colour and in cereals it increases the plumpness of grain. It tends to also increase succulence in plants such as radishes and lettuce. AN is widely known as a top dressing fertilizer, which ensures that your crop finishes the race strong. Superfert AN Fertilizer can be applied to all crop types, particularly maize, sugar beans, wheat and tobacco. The cost per unit of nitrogen for this fertilizer is higher compared to Urea because there is 50% of the nitrogen in the nitrate form whilst the other 50 is in the ammoniacal form.
Supertop / Calcium Ammonium Nitrate (CAN/LAN)
Superfert Calcium Ammonium Nitrate (CAN) or Supertop is designed to deliver nitrogen to the crop when it needs it most. Supertop also contains calcium and magnesium which can be used to neutralise soil acidity. Calcium, as a nutrient is excellent for building cell walls so in crops such as tomatoes, the resulting fruit will have a longer shelf life if calcium is delivered during growth. In the right quantities this will also avoid blossom end rot occurring in the crop.
Where shelf life and quality is needed, calcium nitrate is a possible answer. The fertilizer has both Calcium and Nitrogen in nitrate form. Calcium has a wide range of benefits in most crops amongst them increasing shelf life in crops such as tomatoes and reducing the occurrences of diseases and pest damage. The nitrogen being in the nitrate form, is the most preferred nitrogen source for most crops and this also helps in allowing the uptake of calcium which would be much needed by the plant making the combination of the two a winning formula.
Urea is a nitrogen straight fertilizer. Our black Urea is a carbon coated Urea meaning in addition to Nitrogen this fertilizer also contains Carbon. It has been shown that for nitrogen fertilizer to be effective, a minimal amount of carbon is required. Carbon coated black urea has an organic complex that contains a unique ratio of cofactors of biological metabolism and oxidative functional groups. These include humic acid, amino acid, fulvic acid, ulmic acid, melanins, peptides, polysaccharides, vitamins and minerals. In order to improve yields in soils with low Carbon one can then opt to top dress with this fertilizer as opposed to a nitrogen straight fertilizer to deliver nitrogen.
This fertilizer is used ideally in a situation where potash application is essential. It is usually applied as a top dressing fertilizer where potash is required as well as nitrogen. It is usually applied in high value crops as it is a fairly expensive source of potash. However, when quality of fruits cannot be compromised, this fertilizer does the job.