The effectiveness of foliar applications of synthesized zinc-amino acid chelates and ZnSO4 on the nutritional status of wheat plant cultivated in a soil contaminated with Cd and diesel oil

 This study was done to evaluate the effectiveness of foliar applications of synthesized zinc-amino acid chelates and ZnSO4 on the nutritional status of wheat plant in a soil contaminated with Cd and diesel oil. 

 Treatments were consist of foliar application of Zn amino acid chelate (Zn(Arg)2 and (Zn(His)2) and ZnSO4 at the rate of 0, 0.1, and 0.2% (W/V) in the soil co-contaminated with Cd (0, 10, and 20 mg Cd/kg soil) and diesel oil (0 and 8% [W/W]). 

 Application of Zn amino acid chelates had a significant effect on increasing plant nutrient status, however, soil pollution with Cd and diesel oil had an adverse effect. Based on the results of this study, application of 0.2% (W/V) (Zn(Arg)2 and (Zn(His)2) significantly increased the grain Zn concentration of the plants grown in the soil polluted with Cd (10 mg Cd/kg soil) and diesel oil (8% [W/W]) by 11.3% and 10.1%, respectively. For co-contaminated soil with Cd and diesel oil, it was increased by 9.8%. Soil microbial respiration has affected by Zn amino acid chelate and soil pollution. According to our results, application of 0.2% (W/V) Zn(Arg)2 chelate significantly increased the soil microbial respiration in the soil polluted with Cd (10 mg Cd/kg soil) and diesel oil (8% [W/W]) by 12.5% and 13.1%, respectively. 

 Zn amino acid chelate had a significant effect in increasing plant nutrient status such as Zn and Fe that is a positive point environmental study.