"Based at the Alberta's Ag Info Center in Stettler, Pauly a year ago issued news releases about the concept. Among his key criticisms is that there is "no mechanism" to hold such gases in well-aerated soil. "If you don't need fertilizer, fertilizer is a waste and then tractor exhaust 'works' fine," Pauly says, implying it has no effect. The nitrous oxide in the exhaust is not a plant nutrient, he says, and that there are "no soil processes that oxidize nitrous oxide into nitrate," which is the form of nitrogen used by plants. He says the amount of carbon dioxide in the diesel exhaust is insignificant compared with the amount given off by microorganisms in the soil."

I am a farmer in Canada and fertilizer does not cost 1200 to 1500 a tonne. There's no way in hell it costs half a million dollars to fertilize 3900 HA of wheat. Injecting diesel exhaust fumes in a single planting pass to totally fertilize each HA of wheat sounds like junk science to me.