A wide product range meeting all the different requirements of the various crops. Rates 1/3/3 and 1/1,5/3 are particularly appropriate as base fertilizers for arboreal crops acting as initiators for blossom production and early fruiting. In vegetable crops they serve to hasten ripening. Their use is recommended where Nitrogen requirement is minimal and in crops with multi stage production and ripening. They also increase sugar content, rate of maturation and fruit colouration. Rate 2/1/1 is particularly suitable when an immediate vegetative push is useful to accelerate crop development; for example to stimulate fruit production and enlargement. Rates 2/0,5/2 and 1,5/0,5/2 are suitable when high nitrogen/potassium ratios necessary as in the blossom stage and during fruit enlargement. The 1/4,5/1 rate is recom-mended during early vegetative phases.