Keywords: Water-soluble fertilizers, crystalline fertilizers, electrical conductivity, fertigation, micronutrients, liquid fertilizers.

The characteristics and some production methods for the most common fertilizers used in fertigation in protected cropping systems are reviewed. The fertilizers discussed include straight nitrogen, phosphorus and potassium solid fertilizers, mixtures of these, metal chelates and liquid fertilizers.

Teija Kankaanpää, Kemira GrowHow Oy, P O Box 330, FIN-00101 Helsinki, Finland.

20 Pages, 2 Figures, 3 Tables, 10 References.