A series of drone photographs of a field with a slight depression further shows how the Dyker affects infiltration and stagnant water. In treated furrows, rainwater was evenly retained in the holes and infiltrated the soil locally, rather than collecting in the depression. Not so in untreated furrows: Here, much of the water remained on the surface and ran off into the depression. The amount of water that collected there exceeded the soil’s infiltration capacity and stood in the furrows for several days, creating anaerobic conditions in the adjacent potato hills. This prevented the plants from growing and ultimately led to crop failure.