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In 1986, a master's thesis study in the Philippines compared the effects of using various fertilizers to enhance milkfish production in brackish water ponds. [7] The study compared the use of using chicken manure only, cow manure only, 16-20-0 fertilizer only, a mixture of cow manure and 16-20-0 fertilizer, a mixture of chicken manure and 16-20-0 fertilizer, and a control group that used no ...
Horses mainly eat grass and a few weeds, so horse manure can contain grass and weed seeds, because horses do not digest seeds as cattle do. Cattle manure is a good source of nitrogen as well as organic carbon. [3] Chicken litter, coming from a bird, is very concentrated in nitrogen and phosphate and is prized for both properties. [3] [4]
Therefore, manure is required to be composted which will ideally kill any seeds or pathogens and reduce the ammonia content. [9] A large commercial compost operation. Chicken litter, which consists of chicken manure and bedding, is an organic fertilizer that has been proposed to be superior for conditioning soil for harvest to synthetic ...
Generally the ammonia content of the digestate accounts for approximately 60-80% of the total nitrogen content, but for a feedstock like kitchen food waste it can be as high as 99%. Digestate has also been reported to have a higher phosphorus and potassium concentration than that of composts. The average P to K ratio is about 1:3.
NPN can also be used to artificially raise crude protein values, which are measured based on nitrogen content, as protein is about 16% nitrogen and the only major component of most food that contains nitrogen is protein. The source of NPN is typically a chemical feed additive, or sometimes chicken waste, [7] [8] and cattle manure.
There have been a number of other substances used for ammonia control. A study in Finland found that peat, which is high in humic acid, when used as poultry litter it was quite effective in controlling ammonia. A number of products have also appeared on the market using de-nitrifying or nitrogen-fixing bacteria. [4]
Manure provides environmental benefits when properly managed. Deposition of manure on pastures by grazing animals is an effective way to preserve soil fertility. Many nutrients are recycled in crop cultivation by collecting animal manure from barns and concentrated feeding sites, sometimes after composting.
Anaerobic lagoons have been shown to harbor and emit substances which can cause adverse environmental and health effects. These substances are emitted through two main pathways: gas emissions and lagoon overflow. Gas emissions are continuous (though the amount may vary based on the season) and are a product of the manure slurry.
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