E-edition PLUS unlimited articles & videos
Personalized news alerts with our mobile app
*FREE access to newspapers.com archives
Hundreds of games, puzzles & comics online
*Refers to the latest 2 years of agupdate.com stories. Cancel anytime.
From left, an example of a shock-discharge unit using an electrified copper bar that can only shock weeds taller than the crop canopy and an example of a continuous-contact electrocution unit, with electrodes dragging along the ground that electrocute all vegetation touched.
GROW
Get up-to-the-minute news sent straight to your device.
