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Manure is organic matter that is used as organic fertilizer in agriculture. Most manure consists of animal feces ; other sources include compost and green manure . Manures contribute to the fertility of soil by adding organic matter and nutrients , such as nitrogen , that are utilised by bacteria , fungi , and other organisms in the soil .
Manure is an abundant resource with estimations for cattle manure in the US alone reaching two billion tons annually, [9] and one hen has the potential to produce a cubic foot of manure every six months. [10] By adding manure to crops it adds nitrogen, potassium, phosphorus, sulfur, magnesium and calcium. [11]
Liquid manure is a mixture of animal waste and organic matter used as an agricultural fertilizer, sometimes thinned with water. It can be aged in a slurry pit to concentrate it. Liquid manure was developed in the 20th-century [ 1 ] as an alternative to fermented manure.
Chicken manure is the feces of chickens used as an organic fertilizer, especially for soil low in nitrogen. [1] Of all animal manures, it has the highest amount of nitrogen, phosphorus, and potassium. [2] Chicken manure is sometimes pelletized for use as a fertilizer, and this product may have additional phosphorus, potassium or nitrogen added. [3]
Guano is a highly effective fertilizer due to the high content of nitrogen, phosphate, and potassium, all key nutrients essential for plant growth. Guano was also, to a lesser extent, sought for the production of gunpowder and other explosive materials.
Phosphate rich organic manure is a type of fertilizer used as an alternative to diammonium phosphate and single super phosphate. Phosphorus is required by all plants but is limited in soil, creating a problem in agriculture In many areas phosphorus must be added to soil for the extensive plant growth that is desired for crop production.