this paper help you

https://www.researchgate.net/publication/316833184_Preparation_Characterization_and_Evaluation_of_Efficacy_of_Phosphorus_and_Potassium_Incorporated_Nano_Fertilizer

S. Tewari Cost only. Unless you’re writing academic theoretical papers... The 'the normal characterization of a nano fertilizer' is that it does not exist commercially.

S. Tewari

There are a number of existing discussions on RG on this topic. I have not yet seen one single commercial use of a nano fertilizer and would be grateful if you could point to any such application.

Here's a previous one:

https://www.researchgate.net/post/how_can_we_synthesize_ammonium_nitrate_nanoparticle_for_fertilizer_purpose

Thanks a lot for your answers. I raised the question from the point of view of

practical applications and commercial production.