Manure is organic matter used as organic fertilizer in agriculture. Manures contribute to the fertility of the soil by adding organic matter and nutrients, such as nitrogen, that are trapped by bacteria in the soil. Higher organisms then feed on the fungi and bacteria in a chain of life that comprises the soil food web.
There are three main classes of manures used in soil management:
Most animal manure is feces. Common forms of animal manure include farmyard manure (FYM) or farm slurry (liquid manure). FYM also contains plant material (often straw), which has been used as bedding for animals and has absorbed the feces and urine. Agricultural manure in liquid form, known as slurry, is produced by more intensive livestock rearing systems where concrete or slats are used, instead of straw bedding. Manure from different animals has different qualities and requires different application rates when used as fertilizer. For example horses, cattle, pigs, sheep, chickens, turkeys, rabbits, humans (sewage), and guano from seabirds and bats all have different properties. For instance, sheep manure is high in nitrogen and potash, while pig manure is relatively low in both. Horse manure also contains lots of weed seeds, as horses do not digest seeds the way that cattle do. Chicken litter, coming from a bird, is very concentrated in nitrogen and protein and is prized for both properties.
Animal manures may be adulterated or contaminated with other animal products, such as wool (shoddy and other hair), feathers, blood, and bone. Livestock feed can be mixed with the manure due to spillage. For example, chickens are often fed meat and bone meal, an animal product, which can end up becoming mixed with chicken litter.
Compost is the decomposed remnants of organic materials – usually of plant origin, but often including some animal dung or bedding.
Green manures are crops grown for the express purpose of plowing them in, thus increasing fertility through the incorporation of nutrients and organic matter into the soil. Leguminous plants such as clover are often used for this, as they fix nitrogen using Rhizobia bacteria in specialized nodes in the root structure.
Uses of manure
Animal dung has been used for centuries as a fertilizer for farming, as it improves the soil structure (aggregation), so that it holds more nutrients and water, and becomes more fertile. Animal manure also encourages soil microbial activity, which promotes the soil's trace mineral supply, improving plant nutrition. It also contains some nitrogen and other nutrients that assist the growth of plants.
Manures with a particularly unpleasant odor (such as human sewage or slurry from intensive pig farming) are usually knifed (injected) directly into the soil to reduce release of the odor. Manure from pigs and cattle is usually spread on fields using a manure spreader. Due to the relatively lower level of proteins in vegetable matter, herbivore manure has a milder smell than the dung of carnivores or omnivores – for example, elephant dung is practically odorless. However, herbivore slurry that has undergone anaerobic fermentation may develop more unpleasant odors, and this can be a problem in some agricultural regions. Poultry droppings are harmful to plants when fresh but, after a period of composting, are valuable fertilizers.
Manure is also commercially composted and bagged and sold retail as a soil amendment. Sometimes even human sewage sludge is used, as is the case for Dillo Dirt, a product that has been sold by the city of Austin, Texas municipal wastewater department since 1989.
Manure generates heat as it decomposes, and it is possible for manure to ignite spontaneously should it be stored in a massive pile. Once such a large pile of manure is burning, it will foul the air over a very large area and require considerable effort to extinguish. Therefore, large feedlots must take care to ensure that piles of fresh manure (faeces) do not get excessively large. There is no serious risk of spontaneous combustion in smaller operations.
There is also a risk of insects carrying feces to food and water supplies, making them unsuitable for human consumption.
Livestock antibiotics and hormones
In 2007, a University of Minnesota study indicated that foods such as corn, lettuce, and potatoes have been found to accumulate antibiotics from soils spread with animal manure that contains these drugs.
Organic foods are much less likely to contain antibiotics as veterinary drugs are not routinely used in organic farming systems. Most organic arable farmers either have their own supply of manure (which would, therefore, not normally contain drug residues) or else rely on green manure crops for the extra fertility (if any nonorganic manure is used by organic farmers, then it usually has to be rotted or composted to degrade any residues of drugs and eliminate any pathogenic bacteria - Standard 4.7.38, Soil Association organic farming standards).
- Album graecum
- Anaerobic digestion
- Coprophilous fungi
- Cow dung
- Ecological sanitation
- ^ Ronald Fisher seems to have used the word manure systematically for what we would call fertilizer today.
- ^ Manure, h2g2, British Broadcasting Corporation
- ^ "Spontaneous Combustion of Manure Starts 200-Acre Blaze 1/08/07 |". abc7.com. http://abclocal.go.com/kabc/story?section=news/local&id=4914451. Retrieved 2010-08-07.
- ^ Livestock Antibiotics Can End Up in Human Foods
- Winterhalder, B., R. Larsen, and R. B. Thomas. (1974.). "Dung as an essential resource in a highland Peruvian community". Human Ecology 2 (2): 89–104. doi:10.1007/BF01558115.
- Antibiotics and Hormones in Animal Manure (Webcast): A two part webcast series about the science available on potential risks and best management practices related to antibiotics and hormones from animal manure
- Cornell Manure Program
- Livestock and Poultry Environmental Learning Center, an eXtension community of practice about animal manure management
- Manure Management, Water Quality Information Center, U.S. Department of Agriculture
- Manure advice for use in gardens
- North American Manure Expo
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