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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] + +
The plant had a production capacity of 570,000 tons per annum (TPA) and an initial construction cost of US$303 million. [13] The plant was supplied by Haldor Topsoe and was commissioned in 1982 after an additional investment of US$15 million. [13] As of 2024, FFC-I has a capacity to produce 403,000 TPA of ammonia and 695,000 TPA of urea. [14]
At high frequency settings, high chart speeds, such fathometers give a picture of the bottom and any intervening large or schooling fish that can be related to position. Fathometers of the constant recording type are still mandated for all large vessels (100+ tons displacement) in restricted waters (i.e. generally, within 15 miles (24 km) of land).
Reduced disease severity was noted at 10 and 20 days post-inoculation in comparison to control plants, and the seaweed treatment was found to be more effective at reducing disease pathology than salicylic acid, a known plant protector from biotic and abiotic stresses. [79]
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]
Large aquaculture facilities (i.e. those producing 20,000 pounds (9,100 kg) per year) which discharge wastewater are required to obtain permits pursuant to the Clean Water Act. [21] Facilities that produce at least 100,000 pounds (45,000 kg) of fish, molluscs or crustaceans a year are subject to specific national discharge standards. [22]
It is possible to farm it in 100% seawater and directly connect its cultivation system to an aquaculture system for a wide range of fish species. [2] Common ice plant is known to accumulate high levels of heavy metals when grown in soil. This new system enables the farming of safe-to-eat organic ice plant by removing it from this environment. [2]
Large aquaculture facilities (i.e. those producing 20,000 pounds (9,100 kg) per year) which discharge wastewater are required to obtain permits pursuant to the Clean Water Act. [167] Facilities that produce at least 100,000 pounds (45,000 kg) of fish, molluscs or crustaceans a year are subject to specific national discharge standards. [168]
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