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Yara Belle Plaine Inc is a nitrate-based fertilizer manufacturer based in Regina, Saskatchewan, Canada, and is part of the Yara International group of companies.. Originally the company was established in 1984 as SaskFerco Products Inc., a joint venture between Cargill (50%), the Government of Saskatchewan (49%), and Citibank Canada (1%), to construct a plant near Belle Plaine, Saskatchewan at ...
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. [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]
[38] [39] A University of North Carolina study found that potential mineralizable nitrogen (PMN) in the soil was 182–285% higher in organic mulched systems than in the synthetics control. [40] There do exist 'fast-release' organic fertilizers with a risk of fertilizer burn. These include uncomposted animal manures, fish emulsion, blood meal ...
For trout, stocking rates of 30 to 50 kg/m 3 are normal at the end of a rearing cycle, while for marine species, such as sea bass and sea bream, the achievable load is lower, between 15 and 20 kg/m 3. The total volume required for a raceway is calculated by dividing the total amount of fish in kg by the desired stocking rate in kg per m 3. [17]
As of the 2017 census of agriculture, there were 2.04 million farms, covering an area of 900 million acres (1,400,000 sq mi), an average of 441 acres (178 hectares) per farm. [ 2 ] Agriculture in the United States is highly mechanized, with an average of only one farmer or farm laborer required per square kilometer of farmland for agricultural ...
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]
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] + +