Organic fertilizers: what they are and how to use them


Fertilizers (or fertilizers) are substrates from which plant organisms can draw the nutrients they need. It is possible to classify them into organic fertilizers and chemical fertilizers. The difference between the two lies in the different origin and nutrient content. As for the first point, organic fertilizers have a biological origin (vegetable or animal), while the second are artificially synthesized. As for the content of nutrients, organic fertilizers have a large amount, while chemical fertilizers usually have few (sometimes only one). The latter, in fact, are often also called targeted fertilizers, precisely because they are designed to provide the plant with a particular nutrient they are lacking.

Classification of fertilizers

It is possible to classify organic fertilizers into two large groups: NP fertilizers and nitrogen fertilizers. The former have a conspicuous amount of nitrogen and potassium, are relatively poor in phosphorus and contain a variable amount of microelements (ie nutrients that the plant needs only minimally). Nitrogen fertilizers, on the other hand, do not differ from NP fertilizers for the content of microelements and nitrogen, but do so for the content of potassium, which, in nitrogen, is rather low. The choice of one over the other must be made according to the needs of the vegetable to be fed. It should be noted that, being organic fertilizers, as established by current regulations, all the nutrients contained, in particular nitrogen, potassium and phosphorus, must strictly be of biological origin.


There are three different ways to fertilize the soil using organic fertilizers: targeted fertilization, administration in strips and direct spreading on the surface. The targeted fertilization is usually done on restricted portions of the plantation in order to provide the plants with a particular nutrient. It is clear that, since organic fertilizers are rather rich in various nutrients, together with the specific nutrient that plants need, using this type of fertilizer, others will also be supplied to the plants. The administration in strips is done on soils whose composition is such as to hinder the germination of the seeds. As for the direct spreading on the surface, however, the warning to do it before sowing is particularly important. Organic fertilizers, in fact, once scattered, they tend to decompose, releasing substances into the soil that can damage the shoots. It is advisable to proceed with sowing only at the end of this decomposition process.

Organic fertilizers: what they are and how to use them: The most common fertilizers

Among the fertilizers of organic origin, the best known of all is undoubtedly manure, also called manure. It is essentially the excrement of farm animals mixed with litter and urine. This fertilizer has a great amending power and is therefore particularly suitable for soils whose texture is to be improved. The animals whose manure is most widely exploited are sheep, cattle, horses and pigs. Sheep manure has an average quantity of nitrogen and potassium of 8%, while it contains about 2% of phosphorus; that of cattle has on average 3% nitrogen and potassium, while it has 1% phosphorus; horse manure contains on average 6% nitrogen, 2% phosphorus and 7% potassium; pig manure on the other hand has a nitrogen content,

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