1. Farmers are using chemicals in bulk, they pick them up in 110-240 gallon containers that include a meter and a pump which are then returned to the dealership. The number of 2.5 gallon containers of old has been greatly reduced
2. He talks about finer and finer sprays. But there is a huge problem with that and it's drift. Drift over on a neighbors crops too often and your insurance carrier will cancel you.
3. I am not certain of the percentage but a fairly large percentage of pesticides are applied by commercial pesticide applicators, often part of a fertilizer company or grain elevator. These commercial applicators must be certified and are held to much higher standards than farmers.
4. He also talks about a positive and a negative charge or what is called electrostatic spraying. This has been around a fairly long while. It's had some success applying fungicides but not that much for other uses.
5. Lastly he speaks about what he calls vertical farming. People have been building these vertical farms for a number of years. I've yet to see the numbers work out so they can make a profit. It's often a high value crop like fruit or vegetables. For example tomatoes out of season where people in an East coast city are willing to pay 2-3x as much at say a Whole Foods. Funny but you never see a follow up story on these farms.