Water-soluble fertilizers for fertigation (also called NPK fertilizers) normally include nitrogen, phosphorus and potassium. Chelated microelements, calcium and magnesium mesoelements or even seaweed, betaines, fulvic acids can be added to the three basic elements, in case of more complex fertilizers.

The different NPK ratios (nitrogen, phosphorus and potassium) of the formulations change according to the objective to be achieved and in relation to the phenological phase in which they are used.

Water-soluble fertilizers can also be used for foliar application.