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Coated urea fertilizers are a group of controlled release fertilizers consisting of prills of urea coated in less-soluble chemicals such as sulfur, polymers, other products or a combination. These fertilizers mitigate some of the negative aspects of urea fertilization, such as fertilizer burn. The coatings release the urea either when ...
Controlled release fertilizers are traditional fertilizers encapsulated in a shell that degrades at a specified rate. Sulfur is a typical encapsulation material. Other coated products use thermoplastics (and sometimes ethylene-vinyl acetate and surfactants, etc.) to produce diffusion-controlled release of urea or other fertilizers. "Reactive ...
Urea is highly soluble in water and is therefore also very suitable for use in fertilizer solutions (in combination with ammonium nitrate: UAN), e.g., in 'foliar feed' fertilizers. For fertilizer use, granules are preferred over prills because of their narrower particle size distribution, which is an advantage for mechanical application.
In 1926, Milorganite made its debut as the first pelletized fertilizer in the United States, [7] with sales directed at golf courses, [4] turf farms, and flower growers. [17] The brand was popularized during the 1930s and 1940s before inorganic urea became available to homeowners after WWII. [citation needed]
Fertilizers with additional macronutrients (S, Ca, Mg) may add more numbers to the N-P-K ratio to indicate the amount. The additional numbers are similarly reported in the oxide mass fraction form. For example, a Polish fertilizer labeled "NPK (Ca,S) 4-12-12 (14-29)" has an equivalent of 14% soluble calcium oxide and 29% total sulfur trioxide. [6]
During 2012–13, company sold 31.62 LMT of urea (including 10.92 LMT of Neem-coated urea). Industrial products of worth ` 956.3 million and Bio-Fertilizers (liquid and solid) of` 36.5 million were sold during 2012–13. Turnover of traded Agri products (compost, seeds, Bentonite sulphur and pesticides) was ` 300.8 million.
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