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Organic fertilizers are derived from living matter of animal or vegetable origin. They are rather bottom fertilizers because to be assimilated by the plants, they must be transformed by the microorganisms of the soil. They are considered as natural fertilizers.

What is an organic fertilizer?

Organic fertilizers come from of living matter, whether animal or vegetable.
Unlike mineral fertilizers, organic fertilizers are not directly assimilable by plants. They must be processed in mineral ions by the micro-organisms present in the soil.
The advantage is that they thus gradually release the nutrients whose vegetation needs. They are therefore bottom fertilizers.
Another advantage is that their use avoids one of the consequences of soil leaching: They do not end up in rivers. As such, they are less polluting.

Organic fertilizers of animal origin

They are numerous and each one with its peculiarities:

  • Dry blood: It comes from the recycling of slaughterhouse waste. It contains about 13% of water-soluble nitrogen that is easily assimilated by plants. As such, it has a "whiplash" action but nevertheless sustainable. It is a good fertilizer to use in spring and especially on flowers.
  • Crushed horn or roasted horn: They are horns and hoofs or hoofs crushed and turned into powder. They can be roasted. It is a nitrogen fertilizer that contains no phosphorus or potash. On the other hand, it is rich in proteins. It is an excellent fertilizer background because the nitrogen will release slowly and gradually ensuring nutrient intake for several months. It is ideal for new plantings. Beware of flowering plants, it may favor the growth of the leaves to the detriment of flowers.
  • Manure: These are both fertilizers and amendments that is to say they also improve the quality of the soil.
    Composed of excrements of animals, therefore more or less digested plants and straw, they must never be used fresh. They burn plants, deplete the soil of nitrogen and contain pathogenic germs. On the other hand, when they are composted (hence the heaps of manure that used to be seen in the farmyard), they bring in humus and promote the development of soil micro-organisms.
    In commerce you find dehydrated manure easier to use.
  • The guano: These are the feces of seabirds or possibly bats. It is very rich in nitrogen, a little less in phosphorus and potassium. It is a complete fertilizer also containing many trace elements. But be careful, it must be metered precisely because it is powerful. His action is fast.
  • Fish bones powder: It is a fertilizer rich in phosphorus and nitrogen. It has a complete action by stimulating the growth of leaves and flowers, promoting the development of roots and strengthening resistance to diseases and cold.
  • Bone powder: Most of the time it is degelatinized and ground bones of cows. It is an easily soluble fertilizer rich in nitrogen and phosphate. Its progressive action helps the growth of roots.

Organic fertilizers of plant origin

They are as numerous as their brothers of animal origin, but some are still little known:

  • The seaweeds: Traditionally used as fertilizer at the seaside, the seaweed is dried and transformed into powder. They are rich in potassium and also contain nitrogen, phosphorus, animate acids and natural antibiotics. It is a complete fertilizer that stimulates the growth of leaves and flowers while enhancing the resistance of plants to diseases and climatic stress.
  • Nettle manureIt is used as an insecticide and as a fertilizer because it is rich in trace elements and vitamins. It stimulates the growth of all plants.
  • Comfrey manure: It is a good complement to nettle manure because it contains less nitrogen and more potassium and many trace elements. It promotes flowering and fruiting.
  • Wood ash: It is a fertilizer rich in potash and phosphorus. Light, it integrates easily with the ground.
  • Castor cake: Little known, it is rich in nitrogen, potassium and phosphorus as well as in trace elements. It is a fertilizer whose action is progressive. It also has insecticidal and repellent properties on Norway rats and field rats.
  • Beet vinasse: A fertilizer still little used which contains a lot of potassium and little nitrogen. It is therefore ideal to encourage ornamental plants to produce beautiful flowers.

Organic fertilizers are considered natural fertilizers. But it is still necessary that the animals or the plants from which they come have been raised or produced in a natural way... The question today is to know: What is a natural or ecological fertilizer?

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