Toxic metals present in soil and water severally affect the food crops and create serious health concerns. The current field study was focused on the impacts of foliar spray of zinc oxide nanoparticles (ZnO NPs) (100 mg/L) and soil applied co-composted biochar (0.5% w/w) on yield and cadmium (Cd) accumulation by grains of wheat (Triticum aestivum L.) under simultaneous Cd and water limited stress. After 60 days of seeds sowing, drought stress was initiated in half plots by alternate irrigation compared to normal irrigation. Plants were harvested after 122 days and various physiological parameters were measured. Results showed that drought and Cd stress collectively decreased plant dry weight and chlorophyll contents and caused oxidative stress in leaves. While application of NPs and co-composted biochar improved the plants biomass and chlorophyll contents by overcoming the oxidative stress and alterating the antioxidants enzymatic activities in stressed plants. Combined application of NPs and co-composted biochar restricted the Cd uptake below its threshold level in grains (0.2 mg/kg). The current study concluded that the combination of ZnO NPs and co-composted BC was helpful to improve wheat growth and biomass, chlorophylls contents, antioxidant enzyme activities by scavenging ROS and reducing Cd uptake by plants under simultaneous Cd and drought stress.

土壤和水中存在的有毒金属会分别影响粮食作物并造成严重的健康问题。当前的田间研究集中于叶面喷洒氧化锌纳米颗粒（ZnO NPs）（100 mg / L）和土壤施用的复合生物炭（0.5％w / w）对谷物产量和镉（Cd）积累的影响小麦（普通小麦）L.）同时受Cd和水的限制。种子播种60天后，与常规灌溉相比，通过交替灌溉在一半地块中引发了干旱胁迫。122天后收获植物，并测量各种生理参数。结果表明，干旱和镉胁迫共同降低了植物的干重和叶绿素含量，并引起了叶片的氧化胁迫。NPs和共混生物炭的应用通过克服氧化胁迫和改变胁迫植物中抗氧化剂的酶促活性，提高了植物的生物量和叶绿素含量。NP和共混生物炭的联合施用将谷物中Cd的吸收限制在其阈值水平以下（0.2 mg / kg）。