Hi,

The answer to that question depends on many factors. First, what kind of "nanotechnology" do you refer to. I assume you mean nanoparticles and nanomaterials. In that case, the composition of such nanoparticles is a key point. You can find a paper dealing with your question here: http://journal.frontiersin.org/article/10.3389/fchem.2015.00064/full

In addition, I have also some brief comments about this at the end of this paper: http://journal.frontiersin.org/article/10.3389/fenvs.2017.00012/full

I hope that will help a little bit to get an answer.

Regards,

Alex

 Nanopollutants are nanoparticles small enough to enter your lungs or be absorbed by your skin. Nanopollutants can be natural or man-made. Nanoparticles are used in some of the products found on shelves today, like anti-aging cosmetics and sunscreen. The highest risk is to the workers in nano-technology research & manufacturing processes.

Source: http://www.futureforall.org/nanotechnology/risks.htm

Here, a recent review on the topic : Sadeghi et al., Advances in Nanotechnology as They Pertain to Food and Agriculture: Benefits and Risks. Annu. Rev. Food Sci. Technol. 2017. 8:467–92

Thank you all for your valuable answer concern the risk of nanotechnology in agriculture and food production.