The application of nanomaterials in agriculture is one of the most greatly studied areas in nanotechnology as it includes the using of nanofertilizers to transport nutrient elements to the plant at the needed time and required amount, thereby improving the use efficiency. This work was designed to investigate the effects of soil incorporation of two different types of engineered nanofertilizer namely: carbon nanotubes and chitosan nanoparticles alone or loaded with nitrogen, phosphorus and potassium (NPK) on the different growth criteria of French bean plants. The results indicate that after about 30 days from the date of planting, nanomaterials either alone or in combination with NPK significantly decrease plant growth and increase the activity of antioxidant enzymes implying that French bean plants were exposed to an oxidative stress.