SODA SPRINGS, Idaho — Dan Lakey raised half of this year’s crops without fertilizer and seed treatments, putting his faith in a “hard to grasp” technology he hadn’t previously tested that uses tractor ...

BRANDON, Manitoba -- Yes, Darrel Carlisle's apparatus for improving the nutrition of the soil and plant structure with tractor exhaust looks strange. The big question is: Does it work? Carlisle, a ...

Will it work, or not? Tension is mounting for East Midlands contractor Steve Heard as harvest approaches and the results of his pioneering soil exhaust injection system are revealed. Last autumn, Mr ...

As a way of beating the soaring cost of fertiliser, it’s certainly inventive. Farmer Steve Heard has redesigned the exhaust system of his tractor to pump its mineral-rich diesel fumes into the soil – ...