Evaluation of humic acid effect on growth and accumulation potential in Sport turfgrass during cadmium stress

To avoid more environmental pollution, it is important to find an appropriate way to reduce the accumulation of heavy metals in metropolitan cities. The use of ornamental plants is a good choice to replace edible crops in soils of heavy metals contaminated. So, the purpose of this study was to evaluate the effect foliar application of humic acid (0, 250 and 500 mg/l) and cadmium application in different concentrations (0, 50 and 100 mg/kg) on growth and cadmium accumulation of sport turfgrass as a factorial experiment based on completely random design. The results showed that cadmium at 50 mg/kg concentration reduced growth characteristics. The growth of shoots was reduced at 250 mg/l of foliar application of humic acid. These results revealed that foliar application of humic acid can be used to remediate cadmium from soil in sport turfgrass. So, the humic acid at 500 mg/l concentration was achieved the highest amount of shoot cadmium accumulation from soil contaminated at 50 mg/kg cadmium concentration. According to the results of this experiment, since the amount of accumulation in mowed shoot was higher than others organs, this turfgrass can be recommended in phytoremediation of cadmium in contaminated areas with this metal.