pH can influence the efficiency for pesticides. We also know that hardness of the water can influence the availability of nutrients in fertigation systems.
How do both of these parameters influence the effect on foliar application of fertilizers.
There is one interesting article on effect of pH on cotton for foliar.
http://www.ipni.net/publication/bettercrops.nsf/0/F344B8D48D52D2F785257D2E006FE637/$FILE/BC-1995-2%20p20.pdf
Do people know more articles or have experience with the effect on efficiency or phytotoxicity?
Yes, both parameters seem to be important for foliar application. There is much more information, but here's a pinch of it
Article Effects of foliar application of some macro- and micro-nutri...
Article Effect of Adjuvants and pH Adjuster on the Efficacy of Sulco...
https://www.proquest.com/openview/a3de0b7b6b7815c8e9081c2e5c2f65c7/1?pq-origsite=gscholar&cbl=18750&diss=y
Dear @Herman Eijkelboom Yes, water quality including pH and hardness affects efficiency of foliar application of fertilizers and pesticides.
https://www.researchgate.net/publication/264557980_Foliar_zinc_uptake_process_and_critical_factors_influencing_foliar_Zn_efficacy
https://www.frontiersin.org/research-topics/1092/factors-affecting-the-efficacy-of-foliar-fertilizers-and-the-uptake-of-atmospheric-aerosols
https://www.researchgate.net/publication/280920360_Water_in_pesticide_application
https://extension.psu.edu/ph-and-water-modifications-to-improve-pesticide-performance
Kindly review this one..
https://www.proquest.com/openview/a3de0b7b6b7815c8e9081c2e5c2f65c7/1?pq-origsite=gscholar&cbl=18750&diss=y
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