In the allotment garden offer the mineral fertilizers in the form of mixed- or complete fertilizers have certain advantages.
Mineral fertilizers are called complete fertilizers, not just one, but contain several nutrients in a ratio that is favorable for most species. Over-fertilization with one or the other nutrient cannot occur when they are used. For vegetables with high potash- and nitrogen requirement is, however, still an additional supply of special potash- or. nitrogen fertilizers required, to prevent a unilateral nutrient deficiency.