21.   Where white men--overall-clad farmers-- chewed tobacco and tilled the soil from sunup to sundown.

22.   Years ago, I decided to try to put an end to my weed problems, and began by dispensing with tilling my soil.

23.   Farms can substantially reduce atmospheric carbon levels if, instead of tilling the soil, they coat the land with emission-trapping resins.

24.   The traditional life of tilling the soil is being transformed into the numbing shifts of the assembly line.

25.   Wheat farmers, for example, must till their soil more frequently if they choose organic pest control over conventional spraying, and that raises concerns about soil erosion.