Organic Fertilizers: By Definition Natural

Organic fertilizers feed the soil and maintain its fertility but do not improve its characteristics. They come in a variety of products that are all natural, as opposed to synthetic products from the chemical industry.

organic fertilizer in powder form

engrais organique en poudre

What are the characteristics of organic fertilizers?


Organic fertilizers are all natural, that is to say, they are derived from materials from living beings, animals or plants. They release nitrogen, phosphorus and potassium into the soil in varying quantities, but always in such a way that the plants are not affected too quickly, which would prevent them from developing normally.

Be careful, however, if organic fertilizers are natural, they are not necessarily organic because slaughterhouses, fishing industry, livestock, crops or the sea do not necessarily have the “organic” label … In addition, “natural” does not always mean that it is environmentally friendly: the marine guano of birds, for example, is subject to controversy because of the destruction of nesting sites.

Among organic fertilizers, we distinguish between those that are solid, generally in powder form, which are spread and mixed with the soil by scratching the surface, and those that are liquid, used as foliar sprays.

Solid organic fertilizers


Some solid organic fertilizers have a rapid action of the “whiplash” type, without risk of burning or leaching:

Dried blood: it comes from poultry slaughterhouses and comes in powder form. It provides a lot of nitrogen and a little phosphate. It is spread in spring on leafy vegetables, for an action under 1 month.

Dehydrated droppings : it is produced by intensive poultry farms. It is complete since it contains the famous NPK in equal parts. It is suitable for all vegetables and can be applied in spring for a quick action.

Seaweed powder: made from seaweed and kelp, this organic fertilizer, very rich in trace elements, can be spread on all vegetables in the spring, and takes 1 to 2 months to show its effects.

Other solid organic fertilizers work in a progressive way, meaning that the release of nutrients can take several years:

Bone meal and bone meal: these phosphate-rich fertilizers also release some nitrogen, very gradually over the year. They are suitable for fruit and root vegetables and can be applied in spring or fall.

Castor oilcake: derived from the pressing of castor seeds, this oilcake provides a lot of nitrogen and a little phosphate, potash and trace elements. In autumn or spring, they can be spread on leafy vegetables and buried immediately, for a progressive action over the year.

corne broyée, engrais organique

Crushed horn: coming from slaughterhouses, this powder is put at the foot of perennial crops (shrubs, asparagus, artichokes …) in the fall because its action is slow to release nitrogen, but also phosphate, potash, sulfur, magnesia.
Liquid organic fertilizers
Liquid organic fertilizers are organic preparations that are not very concentrated and are “cooked” by the gardener, but they have a rapid action:

Purins: most often known as insect repellents, they also have fertilizing virtues when they have fermented for 3 weeks. Nettle manure is rich in trace elements and nitrogen and comfrey manure, for example, is concentrated in trace elements and potassium.

Molasses : it is made from the pressing of grapes and beets, and is rich in potassium.

Seaweed juice: it contains NPK in smaller quantities.

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