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Chemical fertilizers

Purposes of fertilizer

Fertilizers are divided into organic and chemical: the characteristics and effects are very different and more or less indicated depending on the final purpose. Generally speaking, fertilizer is used to enrich the soil with nutrients that are essential for plants to grow, but not always naturally present in sufficient quantities in the soil. In other cases, fertilizer is important to remedy the washout effect, which causes the dispersion of nutrients previously present in the soil. With fertilizers it is possible to correct specific characteristics of the soil, such as its pH and its alkalinity. The chemical fertilizerson the market they are very varied and must therefore be selected on the basis of the specific needs of the plants being cultivated and on the basis of the characteristics of the soil, in order to guarantee the contribution of the most important and deficient substances. Among these, the most important are nitrogen, potassium and phosphorus, which can be present in different quantities and therefore added to the soil in a progressive way, respecting the vegetative cycle of the plants and their different needs depending on the period of the year.

Composition


Fertilizers must be selected based on the characteristics of the soil: choosing which one to buy is not always easy. The chemical abbreviations on the packaging act as a guide, which have the task of making known the chemical elements contained in the compound, with relative percentages. In this way it is possible to identify the fertilizer that can best meet the different needs of the soil, without causing deficiencies or even excesses, which can be equally harmful to crops. The chemical fertilizersthey usually consist of several elements and for this reason their presence is indicated by the chemical abbreviations corresponding to the individual elements contained. The most common fertilizers, as seen, are those that meet the main needs of the different types of soil, allowing the supply of phosphorus, nitrogen and potassium. The percentages of the component elements may vary, but usually the elements present are recurring and allow the correct balance of the final product. Nitrogen-based fertilizers are usually rich in calcium nitrate, sodium and ammonium sulfate, while potassium-based fertilizers are made up of potassium sulfate and nitrate. Phosphorus-based fertilizers are instead composed of calcium phosphate and ammonium phosphate, present in different percentages.

Use of fertilizer


The fertilizer must meet the specific needs of the plants you want to grow, so it is important to know their needs in order to be able to use truly effective applications. It will therefore also be important to respect the life cycles of the plants, taking into account the fact that the different phases will lead the plant itself to have different needs. The method of spreading the different fertilizers can vary in response to the needs of the plants and the soil: fertilizers in solid form are indicated for the preparation of the soil, before the plants are sown there, to make the soil itself able to offer the right chemical composition for the crops that will find a home there. On the other hand, liquid fertilizers are very practical, to be added to the watering water, for the plants that have already sprouted and for the different stages of their life. In this case, it is a question of interventions repeated with a certain periodicity, depending on what is prescribed by the fertilizer itself, in particular in the periods of greatest need for nourishment by the plant, therefore in the middle of its productive period and its development usually in the spring and summer season. The fertilizer can favor the flowering and development of flowers and fruits, as well as the growth of the plant, while it will be less essential in the vegetative rest period of one’s crops. in particular in the periods of greatest need for nourishment by the plant, therefore at the height of its productive period and its development, usually in the spring and summer season. The fertilizer can favor the flowering and development of flowers and fruits, as well as the growth of the plant, while it will be less essential in the vegetative rest period of one’s crops. in particular in the periods of greatest need for nourishment by the plant, therefore at the height of its productive period and its development, usually in the spring and summer season. The fertilizer can favor the flowering and development of flowers and fruits, as well as the growth of the plant, while it will be less essential in the vegetative rest period of one’s crops.

Chemical fertilizers: Contraindications


Chemical fertilizers have undoubted advantages and are functional if used in compliance with the specific needs of the plant, guaranteeing a precise composition of the elements contained therein. However, they can also give rise to some contraindications that it is good to keep in mind if you are preparing to select a fertilizer for your crops. In fact, the choice of the macroelements indicated above is combined with the presence, in smaller percentages, of microelements that are not essential but useful for individual plants: they can vary considerably from fertilizer to fertilizer and be more or less suited to the needs of the different crops in relation to the ground in which they are located. The main risks of chemical fertilization concern residues in the soil and in aquifers, in particular, nitrates, substances with immediate assimilation which are however subject to washout and end up accumulating presenting a risk for plants, for the environment and for man. The risks of pollution are therefore accompanied by the greater ease of use of chemical fertilizers compared to natural ones, in which it is more difficult to keep the exact quantities introduced into the soil under control. For this reason, the use of chemical fertilizers especially in agriculture is regulated by specific rules. The risks of pollution are therefore accompanied by the greater ease of use of chemical fertilizers compared to natural ones, in which it is more difficult to keep the exact quantities introduced into the soil under control. For this reason, the use of chemical fertilizers especially in agriculture is regulated by specific rules. The risks of pollution are therefore accompanied by the greater ease of use of chemical fertilizers compared to natural ones, in which it is more difficult to keep the exact quantities introduced into the soil under control. For this reason, the use of chemical fertilizers especially in agriculture is regulated by specific rules.

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