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This article is about organic material used as soil fertilizer. For animal dung used for other purposes, see feces.
"Animal waste" redirects here. For other types of animal waste, see metabolic waste.
Animal manure is often a mixture of animal feces and bedding straw, as in this example from a stable

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. It is also a product obtained after decomposition of organic matter like cow-dung which replenishes the soil with essential elements and add humus to the soil.

In the past, the term “manure” included inorganic fertilizers, but this usage is now very rare.


There are three main classes of manures used in soil management:

Animal manures[edit]

Cement reservoirs, one new, and one containing cow manure mixed with water. This is common in rural Hainan Province, China.

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.[1] For instance, sheep manure is high in nitrogen and potash, while pig manure is relatively low in both. Horses mainly eat grass and a few weeds so horse manure can contain grass and 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 phosphate 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 containing turkey manure and wood chips from bedding material is dried and then applied to pastures for fertilizer.


Main article: Compost

Compost is the decomposed remnants of organic materials. It is usually of plant origin, but often includes some animal dung or bedding.

Green manure[edit]

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.

Other types of plant matter used as manure include the contents of the rumens of slaughtered ruminants, spent hops (left over from brewing beer) and seaweed.

Uses of manure[edit]

Manure on a wall

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. 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 if stored in a very large pile.[2] Once such a large pile of manure is burning, it will foul the air over a wide area and require considerable effort to extinguish. Therefore, large feedlots must take care to ensure that piles of fresh manure do not get excessively large. There is no serious risk of spontaneous combustion in smaller operations.[citation needed]

There is also a risk of insects carrying feces to food and water supplies, making them unsuitable for human consumption.

Livestock antibiotics[edit]

In 2007, a University of Minnesota study[3] 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 may be much more or much less likely to contain antibiotics, depending on their sources and treatment of manure. For instance, by Soil Association Standard 4.7.38, 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). On the other hand, as found in the University of Minnesota study, the non-usage of artificial fertilizers, and resulting exclusive use of manure as fertilizer, by organic farmers can result in significantly greater accumulations of antibiotics in organic foods.[3]

See also[edit]


  1. ^ "Manure". Bbc.co.uk. Retrieved 2012-11-14. 
  2. ^ "Spontaneous Combustion of Manure Starts 200-Acre Blaze 1/08/07 |". abc7.com. Retrieved 2010-08-07. 
  3. ^ a b staff (2007-07-12). "Livestock Antibiotics Can End Up in Human Foods". Ens-newswire.com. Retrieved 2012-11-14. 

Further reading[edit]

  • 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. 

External links[edit]

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Manure — Please support Wikipedia.
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Capital Press
Wed, 29 Oct 2014 09:41:15 -0700

University of Idaho Extension soils specialist Amber Moore has completed the second season of an eight-year rotational study examining how raw manure affects rotations with wheat, potatoes, barley and sugar beets. Year two was funded with $100,000 from ...

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All about feed
Wed, 29 Oct 2014 04:48:45 -0700

Because manure itself is known to change the composition of bacterial communities in soil, a team led by microbiologist Jo Handelsman, then at Yale University in New Haven, Connecticut, decided to examine whether it also affects drug resistance. The ...
Radio Iowa
Wed, 29 Oct 2014 08:45:00 -0700

State environmental officials say a manure spill at a 15,000 head hog operation in north-central Iowa is contained. Kevin Baskins, spokesman for the Iowa Department of Natural Resources, says the spill near Williams in Hamilton County was discovered ...
Tue, 28 Oct 2014 16:15:00 -0700

"We use the pig manure and cattle manure together with corn, which is produced there on the fields of the local agricultural cooperative," explains Werner Frohwitter, a spokesperson for Energiequelle. It's a green energy company that helped Feldheim ...

Green Bay Press Gazette

Green Bay Press Gazette
Sat, 25 Oct 2014 14:22:30 -0700

Just a few weeks earlier, another truck tipped and spilled about 5,000 gallons of manure in the same part of southern Brown County. The spill was contained to a ditch. Initial reports indicated the crash was caused by the truck slipping on mud as it ...
Allentown Morning Call
Tue, 28 Oct 2014 20:49:14 -0700

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Herald Times Reporter

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Tue, 21 Oct 2014 11:34:01 -0700

MANITOWOC – A 50-year-old man was rescued Tuesday after his farm tractor slipped into a manure pit in the township of Maple Grove and began sinking, according to Deputy Inspector Todd Hermann of the Manitowoc County Sheriff's Department.


Wed, 29 Oct 2014 06:06:47 -0700

Deputies say Robert Lovejoy, 39, of Churchville was driving east on West Middlebury Road around 5:15 p.m. Tuesday when he failed to stop at the stop sign and struck the manure tanker, which was heading south on Starr Road, on its passenger side.

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