DETERMINATION OF THE USE OF MARDİN-MAZIDAĞI PHOSPHATE ROCK RESIDUES AS FERTILIZER

In this study, it was aimed to research the possibilities of direct and acidulated usage of phosphate containing material which was obtained from Etibank Phosphate Enrichment Systems. In the greenhouse experiment, acid and neutr-characterized soils were used. Both oat (Avena Sativa) as a preliminary plant with the period of 5.5 months and rape (Brassica napus) as a second plant with the period of 2 months were grown in 6 kg soil containing pots. 1 g P2 O5 was given to pots in the forms of TSP, fine residue, coarse residue, acidulated fine residue and acidulated coarse residue. Additionally, 1.2 g N (NH4 NO3), 1.5 g K2 O (K2 SO4) were applied to the pots. The effects of rock phosphate on dry weight, phosphorus content and phosphorus uptake of plants were determined. According to the results obtained, it was concluded that the effects of rock phosphate on dry weight, phosphorus contents and amount of phosphorus uptake of both plants were found differently. Depending on soils and residues as a phosphate source the effect of acidulated coarse residue on soils was similar to that of TSP when compared with the effect of TSP on soils, that of direct application of coarse residue was lower and that of the acidulated and direct application of fine residue was the lowest.