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  2. Urea phosphate - Wikipedia

    en.wikipedia.org/wiki/Urea_phosphate

    Urea phosphate is a 1:1 combination of urea and phosphoric acid that is used as a fertilizer. It has an NPK formula of 17-44-0, [ 1 ] and is soluble in water, producing a strongly acidic solution. Urea phosphate is available in fertilizer vendor bags that carry a UP signet on the packaging.

  3. Fertilizer - Wikipedia

    en.wikipedia.org/wiki/Fertilizer

    NPK ratings consist of three numbers separated by dashes (e.g., 10-10-10 or 16-4-8) describing the chemical content of fertilizers. [ 29 ] [ 30 ] The first number represents the percentage of nitrogen in the product; the second number, P 2 O 5 ; the third, K 2 O. Fertilizers do not actually contain P 2 O 5 or K 2 O, but the system is a ...

  4. Labeling of fertilizer - Wikipedia

    en.wikipedia.org/wiki/Labeling_of_fertilizer

    In Australia, macronutrient fertilizers are labeled with an "N-P-K-S" system, which uses elemental mass fractions rather than the standard N-P-K values and includes the amount of sulfur (S) contained in the fertilizer. [5] Fertilizers with additional macronutrients (S, Ca, Mg) may add more numbers to the N-P-K ratio to indicate the amount. The ...

  5. Phosphate rich organic manure - Wikipedia

    en.wikipedia.org/wiki/Phosphate_rich_organic_manure

    Phosphate rich organic manure is a type of fertilizer used as an alternative to diammonium phosphate and single super phosphate.. Phosphorus is required by all plants but is limited in soil, creating a problem in agriculture In many areas phosphorus must be added to soil for the extensive plant growth that is desired for crop production.

  6. Birkeland–Eyde process - Wikipedia

    en.wikipedia.org/wiki/Birkeland–Eyde_process

    By carefully controlling the energy of the arc and the velocity of the air stream, yields of up to approximately 45% nitric oxide were obtained at 3000 °C and less at lower temperatures. [10] [11] The process is extremely energy intensive. Birkeland used a nearby hydroelectric power station for the electricity as this process demanded about ...

  7. Superphosphate - Wikipedia

    en.wikipedia.org/wiki/Superphosphate

    Superphosphate is relatively cheap [6] compared to other available sources of phosphate. The lower price contributes to its widespread adoption, particularly in developing regions where the costs of agricultural inputs are a significant consideration.

  8. UAN - Wikipedia

    en.wikipedia.org/wiki/UAN

    The combination of urea and ammonium nitrate has an extremely low critical relative humidity (18% at 30 °C) and can therefore only be used in liquid fertilizers. The most commonly used grade of these fertilizer solutions is UAN 32.0.0 (32%N) known as UN32 or UN-32, which consists of 45% ammonium nitrate , 35% urea and only 20% water.

  9. Organic fertilizer - Wikipedia

    en.wikipedia.org/wiki/Organic_fertilizer

    Fertilizers are materials that can be added to soil or plants, in order to provide nutrients and sustain growth. Typical organic fertilizers include all animal waste including meat processing waste, manure, slurry, and guano; plus plant based fertilizers such as compost; and biosolids. [2] Inorganic "organic fertilizers" include minerals and ash.