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The third number ("K value") is the equivalent content of potassium oxide K 2 O. [3] For example, a 15-13-20 fertilizer would contain 15% by weight of nitrogen, 13% by weight of P 2 O 5, 20% by weight of K 2 O, and 52% of some inert ingredient.
A maize crop yielding 6–9 tonnes of grain per hectare (2.5 acres) requires 31–50 kilograms (68–110 lb) of phosphate fertilizer to be applied; soybean crops require about half, 20–25 kg per hectare. [21] Yara International is the world's largest producer of nitrogen-based fertilizers. [22]
Red seaweeds have the highest protein content and brown seaweeds have the lowest protein content. [6] Of all the red seaweeds, Porphyra, is the genus most frequently used for human consumption. [7] Brown seaweeds are so plentiful that they most used for industrial animal feeds and fertilizers. [6]
Urea is the most used fertilizer in the world, due to its high content of nitrogen, low cost and high reactivity towards water. [32] When exposed to ocean waters, urea is metabolized by phytoplankton via urease enzymes to produce ammonia. [33] + +
Fauji Fertilizer established its first urea plant, FFC I, in Sadiqabad in 1979. [12] The plant had a production capacity of 570,000 tons per annum (TPA) and an initial construction cost of US$303 million. [12] The plant was supplied by Haldor Topsoe and was commissioned in 1982 after an additional investment of US$15 million. [12]
Fish oil is used in aquaculture feed, in particular for feeding farmed salmon. [4] Marine and freshwater fish oil vary in contents of arachidonic acid, EPA and DHA. [5] The various species range from lean to fatty, and their oil content in the tissues has been shown to vary from 0.7% to 15.5%. [6] They also differ in their effects on organ ...
In 2023, Engro Fertilizers reported a record urea production of 2.3 million tonnes, a 18.3% increase over previous year's production. [21] In June 2024, Engro completed the largest turnaround of the EnVen plant over a period of 2 months, with investment of around $50 million and a manpower of more than 6000 people.
[36] [37] When looking at meat only, ruminants consume an average of 2.8 kg of human edible feed per kg of meat produced, while monogastrics need 3.2 kg. [36] [37] Finally, when accounting for the protein content of the feed, ruminant need an average of 0.6 kg of edible plant protein to produce 1 kg of animal protein while monogastric need 2 kg.