It is important to keep in mind that fertilisers are neither the cure nor the solution for diseased plants, plants that are not adapted to their environment or plants that are poorly cared for.
Furthermore, it is necessary to keep in mind that fertilisers are appropriate only when they are needed, in the right amounts, at the right time and in the right place.
In irrigation application, fertiliser should be applied on the surface of the soil or mulch, as rain or irrigation will move the fertiliser to the roots. Without irrigation or rain, fertiliser can be lost through evaporation into the atmosphere without any benefit to the plant. In foliar treatment, the quality of the application and the quality of the adjuvants used are key to rapid nutritional assimilation.