Naturally organic fertilizers include manure, slurry, worm castings, peat, seaweed, sewage, and guano. Green manure crops are grown to add nutrients to the soil. Natural minerals such as mine rock phosphate, sulphate of potash and limestone are also considered as organic fertilizers.

Manufactured organic fertilizers include compost, blood meal, bone meal and seaweed extracts. Other examples are natural enzyme digested protein, fish meal, feathers and food.

The decomposition of crop residue from previous years is another source of fertility. Although not strictly considered as "fertilizer", the distinction seems more a matter of words than reality.

Some ambiguity in the use of the term "organic" exists because some of synthetic fertilizers such as urea and urea formaldehyde. It would be difficult to distinguish chemically between urea and bio-produced synthetically. On the other hand, some fertilizer materials approved for organic farming, such as limestone powder, extracted from rock phosphate and Chile saltpeter, are inorganic in the use of the term of chemistry.

Although the density of nutrients in organic matter is relatively modest, they have certain advantages. The majority of nitrogen supplying organic fertilizers contain insoluble nitrogen and acting as a slow-release fertilizer. Although it is widely thought organic fertilizer is best, the balance of the responsible use organic or inorganic fertilizer can be just as good for the soil.

The theories of modern farming admit the obvious success of the theory of Liebig, but stress that there are serious limitations to the current methods for implementing chemicals fertilization. They re-emphasize the role of humus and other organic soils, which are believed to play several important roles:

* Mobilize soil nutrients available, so that good growth is achieved with lower nutrient density while wasting less

* The release of nutrients at a slower rate more, helping to avoid a boom-and-bust model

* Helping to conserve soil moisture, stress reduction due to moisture temporary

* Improving the soil structure

Organics also have the advantage of avoiding some problems associated with regular use of artificial fertilizers:

* The need for new artificial fertilizers regularly (and perhaps in quantities of more and more) to maintain fertility

* Broad soluble in runoff of nitrogen and phosphorus, leading to eutrophication

* The costs may be lower if the fertilizer is available locally

Organic fertilizers can have drawbacks:

* As a dilute source of nutrients compared with inorganic fertilizers, transport large quantities of fertilizer costs higher. Especially with manure.

* The composition of organic fertilizers tend to be more complex and vary from a standard product inorganic.

* Mal-processed organic fertilizers May contain pathogens plant or animal materials that are harmful to humans or plants. However, a composting should remove them.

In the non-farming a compromise between the use of artificial and organic fertilizers is common, often using inorganic fertilizers supplemented by the application of organic materials that are easily accessible such as the return residue crops or application of manure.

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