Opinion: GHG debate needs debit-credit balance

May 17, 2023

The home plate in baseball is 17 inches wide.

I listened to a presentation by the University of Saskatchewan agricultural economist Richard Gray at the end of March. In his submission, he suggested there was an error in greenhouse gas emission accounting. Kevin Hursh mentioned this in his column on page 11 of the April 6 issue.

Gray hypothesized that the accounting does not account for the carbon dioxide withdrawn from the atmosphere, converted to energy, stored in a kernel of grain, and exported to a user. The farm does not get credit for that exported carbon.

Industry champions support his hypothesis. I hear words like “rewarded,” and that past practices should be in the reward mix and the United Nations’ Intergovernmental Panel on Climate Change coefficients are wrong.

But the IPCC protocols for reporting emissions do address this energy transport. The accounting for respiratory emissions is on a worldwide scale. Their protocol is slightly less than a one-to-one debit and credit.

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Video: Root Exudates, Soil Biology, and How Plants Recruit Microbes | Field Talk Friday

Field Talk Friday | Dr. John Murphy | Root Exudates, Soil Biology, and How Plants Recruit Microbes

Most of us spend our time managing what we can see above ground—plant height, leaf color, stand counts, and yield potential. But the deeper you dig into agronomy, the more you realize that some of the most important processes driving crop performance are happening just millimeters below the surface.

In this episode of Field Talk Friday, Dr. John Murphy continues the soil biology series by diving into one of the most fascinating topics in modern agronomy: root exudates and the role they play in shaping the microbial world around plant roots.

Roots are not passive structures simply pulling nutrients out of the soil. They are active participants in the underground ecosystem. Plants constantly release compounds into the soil—sugars, amino acids, organic acids, and other molecules—that act as both energy sources and signals for soil microbes.