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A field experiment was conducted at the field of the college of Agriculture, Al-Muthanna University, to study the effect of levels of zeolite, sulfur, and phosphorous, and the interactions on availability phosphorous in the soil, during the 2019-2020 agricultural season, by Randomized complete Block design (RCBD) with three replicates. The experiment contains three factors, the first factor included two levels of zeolite added in volume 0 and 3%, the second factor were three levels of agricultural sulfur 0, 150 and 300 kg S ha, and third factor were three levels of phosphorus were 0, 60 and 120 kg P ha. The land was divided into plots with three blocks, the area of the experimental unit was 2×2 m , the experimental unit included 8 lines with a length of 2 m, the distance between one line and another was 20 cm, the distance was left 75 cm between one replicate and another. The seeds of wheat were planted with IBA cultivar on 11/18/2019 at the lines. The results indicated that the addition of zeolite had a significant effect in increasing the amount of availability phosphorus in the soil after 45 days of planting, its average highest was 30.9 mg P ha. The binary interactions between phosphorous, sulfur, phosphorous, and zeolite have a significant effect in increasing the amount of availability phosphorous in the soil, the highest mean achieved of 45.3 and 43.9 mg P kg soil for treatments S1P2 and Z0P1, respectively, for 15 days of planting, and 38.0 and 38.5 mg p kg soil for Z2P2 and S0P2 treatments, respectively, for 30 days of planting. The triple interaction was significantly affected, the treatment Z0P2S2 was the highest average of availability phosphorous in the soil after 15 days of planting, which was 49.7 mg P kg soil. Zeolite, sulfur, and phosphorous levels and their interactions affected the amount of release phosphorus during plant growth periods (15-90 days). The Eelovich Equation surpassed the first-order equation, explaining and describing the mechanics and speed of release phosphorous in soil, gave the coefficient of release phosphorous velocity (Kd), ranged between 0.1240-0.2956. The highest coefficient, correlation (r), of 0.9879. The treatments S2P1 and S2P2 achieved the highest amount of freely combined phosphorous, the amount of 10.32 and 10.22 mg. P kg soil.

THE EFFECT OF LEVELS OF ZEOLITE, PHOSPHOROUS AND SULFUR ON AVAILABILITY AND RELEASE OF PHOSPHOROUS IN SOIL