Foliar sprays of acids

Apparently, doing foliar sprays with things like ascorbic acid, citric acid, and acetic acid can have significant benefits to plants (although too much can kill them). It can improve drought-tolerance, salinity-tolerance, plant growth, and fruit quality.

- https://www.proquest.com/docview/1477432609
- https://www.tandfonline.com/doi/abs/10.1080/03650340.2015.1028379
- https://www.ishs.org/ishs-article/1145_10
- https://www.nature.com/articles/s41598-019-51178-w