Voyage entre Sol et Terre

Claude and Lydia Bourguignon, agricultural engineers, propose to revisit a number of agricultural practices. They study the ground more than the earth and they spend two-thirds of the year in France and abroad digging holes.

They observe, feel, taste the earth before extracting samples at different depths on which they do chemical reactions on hand to define the composition. They then study them under a microscope in the trunk of their all-terrain vehicle before bagging for a closer look at their lab in Burgundy. Their findings go well beyond the simple production...