Fertilizers are used in almost all crops. It is important to get maximum performance with controlled application of the fertilizer in portions, to provide a beneficial effect on plant growth. Coatings control the release of nutrients, by avoiding washing away of fertilizer salts, and by making NPK (Nitrogen, Phosphorous, Potassium) application uniform.
Poor storage conditions or storage without proper treatment results in the formation of clumps or powders and insufficient granulation leading to yield losses. Michelman NurtureYield® K products protect those fertilizers which are most easily dissolved in water.
|NurtureYield® K 6001||Specialty Dispersion||Ammoniated dispersion||24.2–25.4||•||•|
|NurtureYield® K 6002||Specialty Dispersion||Ammoniated / alkali dispersion||20–22||•||•|
|NurtureYield® K 6010||Emulsion||Nonionic||49.5–50.5||•|
|NurtureYield® K 6021||Emulsion||Anionic||38.5–39.5||•|
|NurtureYield® K 6024||Emulsion||Anionic||48–52||•|
Anti–caking coatings preserve the granular nature of fertilizer. Urea, urea based NPK, CAN (Calcium ammonium-nitrate) or nitro–phosphatic NPK fertilizers are most in need of these coatings; whereas superphosphates, ammonium sulphate, and DAP (Diammonium phosphate) do not need anti–caking treatments due to their less hygroscopic nature.
Hygroscopicity is affected by: Chemical composition of the fertilizer, moisture content, ambient temperature, relative humidity, particle structure and porosity, exposure time, and particle surface area.
Moisture control products like NurtureYield® K6021 keep the pellets of fertilizer from immediately washing away, providing a more controlled release.
The anti–caking agents on wetting make the surface of the granule resistant to water so that the rate of moisture absorption by the granules is reduced. A hydrophobic barrier between two granules is provided to prevent bonding due to capillary adhesion. It restricts caking under the influence of humid conditions maintaining the granule geometry of the product and makes it free-flowing. Estimated loading levels are around 0.05% dry weight of emulsion on the dry weight of the fertilizer.
Slow –or controlled– release fertilizers delay the availability of a nutrient(s) for plant uptake or extend its availability to the plant longer.
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