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  2. Soil fertility - Wikipedia

    en.wikipedia.org/wiki/Soil_fertility

    Nitrogen and potassium are also needed in substantial amounts. For this reason these three elements are always identified on a commercial fertilizer analysis. For example, a 10-10-15 fertilizer has 10 percent nitrogen, 10 percent available phosphorus (P 2 O 5) and 15 percent water-soluble potassium (K 2 O). Sulfur is the fourth element that may ...

  3. Fertigation - Wikipedia

    en.wikipedia.org/wiki/Fertigation

    Nitrogen is the most commonly used plant nutrient. Naturally occurring nitrogen (N 2) is a diatomic molecule which makes up approximately 80% of the Earth's atmosphere. Most plants cannot directly consume diatomic nitrogen, therefore nitrogen must be contained as a component of other chemical substances which plants can consume.

  4. Controlled-release fertiliser - Wikipedia

    en.wikipedia.org/wiki/Controlled-release_fertiliser

    Controlled-release fertilizer is also known as controlled-availability fertilizer, delayed-release fertilizer, metered-release fertilizer, or slow-acting fertilizer. Usually CRF refers to nitrogen-based fertilizers. Slow- and controlled-release involve only 0.15% (562,000 tons) of the fertilizer market (1995).

  5. Some states have banned sewage-made fertilizers. Oklahoma ...

    www.aol.com/states-banned-sewage-made...

    Oklahoma has one of the most extensive biosolid fertilizer programs in the nation, as more than 80% of the state’s wastewater sludge ends up on crop fields, according to Investigate Midwest’s ...

  6. Oklahoma Department of Agriculture, Food, and Forestry

    en.wikipedia.org/wiki/Oklahoma_Department_of...

    It is responsible for providing services and expertise that promote and protect Oklahoma's food supply and natural resources while stimulating economic growth. The Department is governed by the State Board of Agriculture. The Board consists of five members appointed by the Governor of Oklahoma, with the approval of the Oklahoma Senate. The ...

  7. Fertilizer - Wikipedia

    en.wikipedia.org/wiki/Fertilizer

    Nitrogen fertilizers are made from ammonia (NH 3) produced by the Haber–Bosch process. [28] In this energy-intensive process, natural gas (CH 4) usually supplies the hydrogen, and the nitrogen (N 2) is derived from the air. This ammonia is used as a feedstock for all other nitrogen fertilizers, such as anhydrous ammonium nitrate (NH 4 NO 3 ...