PHOSPHORUS CONTENT IN SOIL AND IN FRESH AND COOKED RED BEET IN DEPENDENCE ON DIFFERENT FERTILIZATION

Three-year field fertilization trial with red beet (Beta vulgarisvar.conditiva) was carried out in a hilly-mountainous part of Croatia. The trial was set up according to the Latin square method with four fertilization treatments (unfertilized control, 5 kg m-2stable manure, and 50 and 100 g m-2NPK 5-20-30). The highest soil phosphorus content was obtained in the treatment with 100 g m-2NPK 5-20-30 or stable manure (up to 139 mg P2O5kg-1soil). In all three investigation years, the highest fresh and cooked red beet phosphorus content was recorded in the treatment with 5 kg m-2stable manure (400 and 358 mg P 100 g-1dry weight). The highest values were recorded in 2005, probably owing to very good agroecological conditions. Cooked red beet phosphorus content was 10 % lower than in fresh red beet in all trial years.