Fig. 2From: Toxicity of ZnO and Fe2O3 nano-agro-chemicals to soil microbial activities, nitrogen utilization, and associated human health risksPlant yield after the application of poultry manure alone and in combination with ZONPs and IONPs (a). N recovery of radish plant from PM with or without NPs (b). The error bars represent standard errors ( ±) of the mean values. Bars with different letters are significantly different at a 5% probability levelBack to article page