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  2. 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.

  3. Fertilizer - Wikipedia

    en.wikipedia.org/wiki/Fertilizer

    The main nitrogen-based straight fertilizer is ammonia (NH 3) ammonium (NH 4 +) or its solutions, including: Ammonium nitrate (NH 4 NO 3 ) with 34-35% nitrogen is also widely used. Urea (CO(NH 2 ) 2 ), with 45-46% nitrogen, another popular source of nitrogen, having the advantage that it is solid and non-explosive, unlike ammonia and ammonium ...

  4. Biofertilizer - Wikipedia

    en.wikipedia.org/wiki/Biofertilizer

    A biofertilizer is a substance which contains living micro-organisms which, when applied to seeds, plant surfaces, or soil, colonize the rhizosphere or the interior of the plant and promotes growth by increasing the supply or availability of primary nutrients to the host plant. [1] Biofertilizers add nutrients through the natural processes of ...

  5. Agriculture - Wikipedia

    en.wikipedia.org/wiki/Agriculture

    Agriculture. Agriculture encompasses crop and livestock production, aquaculture, and forestry for food and non-food products. [ 1 ] Agriculture was a key factor in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled people to live in cities.

  6. 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 ...

  7. Eutrophication - Wikipedia

    en.wikipedia.org/wiki/Eutrophication

    e. Eutrophication is a general term describing a process in which nutrients accumulate in a body of water, resulting in an increased growth of microorganisms that may deplete the water of oxygen. [1][2] Eutrophication may occur naturally or as a result of human actions. Manmade, or cultural, eutrophication occurs when sewage, industrial ...