THE EFFECT OF ORGANOMINERAL FERTILIZER PHOSPHORUS ON THE AVAILABILITY OF PHOSPHORUS IN A CALCAREOUS SOIL

This study focused on the effect of organomineral fertilizers on phosphorus availability and uptake by plants in calcareous soils. With this aim, an incubation test and a pot experiment were carried out to see the effect of phosphorus in the organomineral fertilizer prepared by mixing the mineral fertilizer source phosphorus with the organic fertilizer from the biogas plant on the availability of phosphorus in soil and on the nutrition of the wheat plant. In both experiments, increasing rates of organomineral fertilizer-phosphorus were applied, and they were compared with the triple superphosphate. The soils were sampled twice in the incubation experiment. In the pot experiment, two samples were taken in the tillering and maturation periods. Within the tillering period, the whole plant was sampled, and two separate samples, namely stover and grain, were taken at maturity. The results of the incubation experiment showed that the contents of Olsen-phosphorus in the soils treated with organomineral fertilizer-phosphorus were higher than those with mineral fertilizer-phosphorus. In line with this, both the phosphorus concentration in the shoots and the phosphorus uptake per pot were higher in the plants treated with the organomineral fertilizer-phosphorus in the tillering period. A similar trend was observed for phosphorus content in grains and total phosphorus uptake at maturity.