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  2. 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 ...

  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. Plant nutrients in soil - Wikipedia

    en.wikipedia.org/wiki/Plant_nutrients_in_soil

    Nutrients in the soil are taken up by the plant through its roots, and in particular its root hairs.To be taken up by a plant, a nutrient element must be located near the root surface; however, the supply of nutrients in contact with the root is rapidly depleted within a distance of ca. 2 mm. [14] There are three basic mechanisms whereby nutrient ions dissolved in the soil solution are brought ...

  5. Plant nutrition - Wikipedia

    en.wikipedia.org/wiki/Plant_nutrition

    The use of inorganic selenium fertilizers can increase selenium concentrations in edible crops and animal diets thereby improving animal health. [31] It is useful to apply a high phosphorus content fertilizer, such as bone meal, to perennials to help with successful root formation. [6]

  6. 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.

  7. Calcium ammonium nitrate - Wikipedia

    en.wikipedia.org/wiki/Calcium_ammonium_nitrate

    The term "calcium ammonium nitrate" is applied to multiple different, but closely related formulations. One variety of calcium ammonium nitrate is made by adding powdered limestone to ammonium nitrate; [1] [2] another, fully water-soluble version, is a mixture of calcium nitrate and ammonium nitrate, which crystallizes as a hydrated double salt: [3] 5Ca(NO 3) 2 •NH 4 NO 3 •10H 2 O.