Choosing the Right Fertilizer - Buying Guides AgriExpo

In order to grow, plants need four vital elements: light, water, a substrate and nutrients. When soil has a nutrient deficiency, it is then necessary to fix this with fertilizers. To do so, it’s important to choose the right kind from the three that are available:

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• Organic fertilizers: This category of fertilizers comes from living matter: animals (horns, blood, manure, etc.) or plants (algae, etc.). They differ from mineral fertilizers in that they are not directly assimilable. They have a slow decomposition, which will provide plants with the nutrients they contain little by little over several months. This slow and progressive process significantly eliminates the risk of overdose.

• Mineral fertilizers: These substances are produced in nature and can be exploited by mining the nautral deposits of certain rocks. However, most mineral fertilizers are chemically manufactured. These chemical fertilizers contain the primary nutrients nitrogen (N), phosphorus (P) and potassium (K). Depending on their dosage, they can be more or less concentrated in nitrogen, phosphorus and potassium and thus meet the different nutritional needs of different plants.

• Organo-mineral fertilizer: These are a mixture of mineral and organic fertilizers composed of mineral materials and a minimum of 25% of organic substances of animal or plant origin.

Nitrogen (N) is mainly used to improve the quality of photosynthesis, which enables the development of stems and leaves. However, given the potential environmental impact, the objective is to use as little as possible according to needs, in order to leave only a minimum of nitrogen in the ground at harvest. Overdoses of nitrogen can also cause aphid attacks and unbalance plant growth.

Phosphorus (P) plays an essential role in plants in the storage of energy and the development of cells. Phosphate fertilizers enhance flower production and promote fructification. Phosphorus is also essential for improving the formation of root systems and stem development.

Potassium (K) is an element that gives plants better growth and above all better resistance to diseases, parasites, frost and drought.

Just  as there are different types of fertilizers, there are different ways the name can be written on the label. The fertilizer name can either be written as the ratio (e.g. 20-10-20), the nutrient (e.g. calcium nitrate) or the functional use of the fertilizer (e.g. for low light conditions).

If the label shows the ratio, three figures will be in bold characters and separated by dashes. These digits represent the percentage, respectively, of total nitrogen, phosphate (P2O5) and potassium (K2O).

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For example, a 20-10-20 fertilizer contains 20% nitrogen, 10% phosphate and 20% potassium.

The label may also indicate what water alkalinity level (low, moderate, medium and/or high) is best for the fertilizer.

The type of plants will also require certain fertilizers over other ones. Here, we’ll point to three specific plants that have particular needs: perennials, grass and potted plants.

Perennial plants feed heavily on phosphorus in order to bloom abundantly, and require fertilizers rich in this mineral such as ones that use fish bone meal, bone meal and even guano. A supply of phosphor at the very beginning of spring will favor their start, while another in the summer will add to the beauty and generosity of the flowering. Perennials will also benefit from an additional supply in early fall.

Grass, like all foliage plants, needs nitrogen all the time, but also phosphorus after sowing, in order to root well. When freshly mowed, a lawn is deprived of a certain amount of nutrients, which you will have to renew by fertilizing again.

Potted plants have particularly significant needs because the limited volume of soil in which they are installed is quickly devoid of any nutrients. Suitable fertilizer must be added regularly. Geraniums and other balcony flowers require a fertilizer rich in phosphorus and especially potassium to flower well. Potted flowering shrubs will need a fertilizer slightly more balanced between P and K.

Are you interested in learning more about Blue NPK Compound Fertilizer? Contact us today to secure an expert consultation!