Effect of Different Phosphate Fertilizers on the Availability of some Heavy Metals in El-Gabal El Asfer Soil under Maize and Wheat Cropping System

HE AIM of this study was to investigate the influence of phosphorus fertilizers, on the availability of some heavy metals in soil El-Gable-El Asfer (irrigated with wastewater for 80 years). Two pots experiments were conducted under greenhouse conditions at Sakha Agriculture Research Station using maize (Zea maize L .) during growing summer season of 2020 and wheat ( Triticum aestivum L .) during growing winter season 2020/21. Soil and plants samples were analyzed for their concentration of Zn, Ni and Cd. Furthermore, the immobilized metal percent, bioaccumulation factor (BAF) and translocation factors (TF) of the heavy metal were calculated. The treatments were, control, Super phosphate Sup 1 (71.4 kg P 2 O 5 ha -1 ), Sup 2 (142.8kg p 2 O 5 ha -1 ), diammonium phosphate DAP 1 (71.4 kg P 2 O 5 ha -1 ) and DAP 2 (142.8kg P 2 O 5 ha -1 ) for maize, and for wheat the treatments were, control, Sup 1 (36.89p 2 O 5 ha -1 ), Sup 2 (73.78 kg P 2 O 5 ha -1 ), DAP 1 (36.89 kg P 2 O 5 ha -1 and DAP 2 (73.78 kg p 2 O 5 ha -1 ). The immobilized metal percent for the studied metals in the experiments soil can be arranged in the descending order Zn> Cd> Ni. The values of bioaccumulation factor (BAF) of Zn, Ni and Cd for maize roots and shoots can be arranged in the following order Cd > Ni > Zn. Data of translocation factor (TF) for the studied metal in maize and wheat, can be arranged in the following order Ni > Cd > Zn.