COMPARISON OF REACTION AND EFFICIENCY OF VARIOUS ZINC FERTILIZERS IN SOUTHERN IRAQI SOILS

Abstract

In this study a four soil samples who have different character were selected to study the interaction of three types of zinc fertilizers in a laboratory experiment. Zinc were added to the fertilizer in a three form: Zinc sulphate, ZnEDTA and ZnDTPA .A three levels of zinc: (0, 10, 500 ppm zinc) mixed with soil. The results of zinc solubility and solubility products indicates that the expressed correlation of the original zinc in all soils were concentrated in a zinc solupility diagram is in a lower position than the representative line of the mass zinc - soil complex, as well as data on the solubility product indicates that adding of any level of zinc sulphate fertilizer lead to increased activity of the measured zinc after the end of the first cycle of moisturizing and drying, and the maximum increase was obtained in the soil of alzubair ( the soil of alzubair mainly contain sands with less clay, less organic material and less calcium carbonate as compared to the rest of the soils). When comparing the effect of the different fertilizer source of zinc, the results showed that ZnDTPA fertilizer was more efficient compared to ZnEDTA fertilizer and zinc sulphate in maintaining a higher concentration of zinc in the soil solution.