Plants fed according to needs
Compared with immediately absorbable mineral fertilizers, these coated fertilizers release nitrogen and other mineral nutrients slowly and continuously. When the fertilizer granules are spread onto the ground, the coating functions as a semi-permeable barrier through which nutrients are released continuously to the roots. The plants can absorb most of the nutrients without excessive losses due to leaching. The risk of fertilizer burn is lower, even when high doses are applied, and the application frequency can be reduced.
Controlled nutrient release
The duration of a coated fertilizer’s effectiveness during the application period is determined solely by the soil temperature, rather than by conditions such as rainfall, irrigation, soil structure, soil pH value and bacterial influences. The higher the temperature, the more quickly the nutrients are released. If the temperature is lower, the nutrients are released more slowly and the fertilizer is effective for a longer period.
How it works
Following application the granule attracts water, which passes through the coating. The dissolved nutrients are then released into the ground by means of osmosis and dissolution. Depending on the product, the nutrients are released over a period of between two and eighteen months, for example. The duration of their release is predictable: no nutrients are lost due to leaching and there is no risk of fertilizer burn.