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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.
Organic sources can also be slow and unpredictable, so patience is critical.
[citation needed] Seaweed-fertilizer also helps in breaking down clays. [ citation needed ] Fucus is used by Irish people as a biofertilizer on a large scale. [ citation needed ] In tropical countries, the bottom mud from dried-up ponds which contain abundant blue-green algae is regularly used as biofertilizer in fields.
NPK rating is a rating system describing the amount of nitrogen, phosphorus, and potassium in a 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.
1972 ― The start of production of extruded mixtures of phosphorus-potassium fertilizer combination in the shop (before 1990.) 1973 ― In December, the fourth line for production of sulfuric acid. 1982 ― The opening of the second workshop on the production of phosphoric acid (the old closed for renovation.)
The most widely used potassium fertilizer is potassium chloride (muriate of potash). [6] Other inorganic potassium fertilizers include potassium nitrate, potassium sulfate, and monopotassium phosphate. Wood ash also has high potassium content but must be used cautiously due its effect on pH level. [7]