UAN or ammonium nitrate is produced when ammonia, nitric acid and urea are combined. This is a liquid fertilizer which has nitrogen content which ranges from between 28-32 percent. UAN can also be applied a lot more uniformly that other non-liquid fertilizer forms. This is a fertilizer that can be missed with pesticides, herbicides as well as other nutrients which permits farmers to reduce application costs where materials are concerned. They can apply a number of materials together rather than separately as in other kinds offertilizers.
UAN is distributed indifferent parts of the world from various companies including AgriCo where you get the best fertilizer rates.
UAN is ammonium nitrate and urea in water and it is used as a fertilizer. This is one combination that has very low critical relativehumidity at 18%. This is what makes it onlyusable in the liquid state.
There are some grades of the fertilizer thatare more popular than others and these are:
- 0.0 (32%N) is also referred to as UN32 or the UN-32 and It consists of ammonium nitrate at a percentage of 45, while urea is at 35% and 20% water
- UAN 28
- UAN 30
- UAN 18
These solutions are corrosive in nature towards mild steel which is around 500 mill inches every year on the C1O10 steel. Usually, they come equipped with an inhibitor of corrosion so as to protect the nozzles, pipelines and tanks and so on. This is a solution that should never be combined with CAN/ calcium ammonium nitrate or calcium nitrate solutions. This is because a milky white and thick insoluble precipitate forms and this may lead to the plugging of pipelines and nozzles.
The physical and chemical characteristics
Urea ammonium nitrate fertilizer has got an amount of water which is remarkably low but also a low salt temperature.
The liquid fertilizers are very popular in different areas and this is because they are quite safe in terms of handling and they are also very convenient in terms of mixing with other chemicals and nutrients. When it comes to application, it is very convenient too and that is the reason why most people prefer to use it.
The production of urea ammonium nitrate fertilizer is relatively simple. Heated solution that has dissolved urea is combinedwith ammonium nitrate solution which is heated so as to create a clear liquid fertilizer. Half of the entire N is from Urea while the other half is gottenfrom ammonium nitrate solution. In some cases, UAN can be made in batches while on others, it is manufactured in a process that s continual. When mixing, there are noemissions or waste products. UAN is highlyconcentrated as an N solution and therefore, the solubility goes up with an increase on the temperature. So as to keep the components N from advancing into crystals, the solutions are made to be more dilute in the regions that have lower temperatures in winter.
Usually the concentration of N in difference UAN fertilizersthat are commercial vary and they range in between 28% to 32%N but this depends on the geography in question. The final solution has a corrosioninhibitorwhich protects the storage tanks which are usually made of steel.
Use in agriculture
The UAN solutions are used as N source for different plant nutrition. 25% of total N which is NO3 is usually available for the uptake of plants while the NH4 Fraction which makes another 25% assimilated by most plants directly but the soil bacteria oxidizes it so as to form NO3.
The other urea portion which is 50% of total is then hydrolyzed by the enzymes within the soil so s to come up with NH4 which is later transformed to the NO3 in different soil conditions.
Urea ammonium nitrate fertilizer is very versatile as a nutrition source for plants. Because of the different chemical properties that it ha, it is well compatible with lots of agricultural chemicals and nutrients and usually, t is mixed withother solutions that have K, P amongotheressentialnutrients that are needed by the plants.
The liquid form fertilizers are usually blended so as to meet all the specific needs of the soil or crop. The solutions can be injected tosoil just beneath the surface or sprayed on the surface of soil. It can also be dribbled on the surface, sprayed in leaves or added to the irrigation water as a way of providing the plants with foliar nutrition.
The UAN can actually cause a lot ofdamage on the foliage whensprayed to some plants directly and therefore, you may have to dilute in some cases.
This is a great source of the N nutrition for different plants. However, half of the N is present in the Urea and therefore, you may need some more management so as to ensure that volatile losses don’t occur. WhenUAN stayson the surface of the soil for long periods sometimes spanning a few days, the enzymes convert urea to NH4. A portion of this can actually be lost in the form of ammonia gas. UAN shouldn’t be on the surface of the soil longer than necessary so as to make sure that a significant lossdoenst happen. In some cases, inhibitors to slow down the transformation can be added.
On first application of UAN to soil, urea and the NO3- molecules are able to move freely with the water within the soil.
NH4 is retained within the soil where it contacts the differentcations exchange sites in the organic matter or clay. In 2-10 days, most urea is convertedto the NH4+ and this isn’tmobile anymore. The original NH4 and the NH4 from urea are converted to NO3 eventually by the differentsoil microorganisms.
The fertilizing effect
Urea ammonium nitrate fertilizer comes in liquid form. It is a fertilizer that acts very effectively for the different flowers, berry gardens, fruit trees, vegetables as well as other outdoor plants. This is a solution which is able to meet all the agriculturalengineering requirements that are most current.
This fertilizer is highly recommended for plantfertilization especially the additional requirements. It can be mixed quite easily with other kinds of fertilizers especially the ones with micro and microelements, retardants, pesticides, nitrification inhibitors and growth regulators.
The liquid can have a colorless appearance or a reddish one and it has substances that are not harmful to plants. It is flameproof, it is non-explosive and doenst emit vapor and this makes it very east to transport and to store. Small quantities can be spread by spraying evenly in the proportion of 23-40kg/ha. The fertilizer is able to meet requirements of additional, local and scattered fertilization via the leaves. The reaction is very close to neutral and it therefore much higher concentration can be used. It is highly recommended for the plants that grow near the hilly or water locations.
The liquid fertilizersare very popular due to the fact that:
- they are quite safe to handle
- can be missed withother chemicals and nutrients quite easily
- are very easy to supply
Whenyou are using over one hundred pounds for every acre, the yields are even wellwhen you split it into summer and spring applications. Deciding the best source of nitrogenfor summer can be quite difficult because each and every one of them has got its own advantages and disadvantages. The factor sited by many producers is risk tolerance plus the cost for every nitrogen fertilizer that is out there. There are many sources of nitrogenand liquid urea ammonium nitrate is one of them,
Ureahas been used for quite a longtime for the early spring and for the fall applications. It is however being used more widely todayover the summer. The advantages are many and they include the fact that the cost is more reasonable and the nutrient density is also higher. It is also easy to store and handle.
One of the greatestdisadvantages is the fact that there is potentialvolatilization which occurswhen urea remains on the surface.
Whensurface applied and then converted to the ammonium carbonate by the urease, then this may happen. Urea is an enzyme that occurs naturally on soils and on the pant residues.
The ultimate combination
UAN combines urea, ammonia and nitrogen in the form of liquid. This means that the urea ammonium nitrate fertilizer combines all the benefits of its components and transfers it to plants. It is important to be very careful so as to avoidthe foliarburnswherethe nitrogenrates are much higher.
A lot of precautions need to be followed so as to minimize explosion risks. Precautions can also reduce risks that are associated with oxidizing properties as well as the release of different toxic fumes in fire. The nitrogen levels determine the kind of precaution that is required for handlingpurposes.