How Pesticides Are Harming Soil Ecosystems

The first year after Jason Ward began transitioning his newly purchased conventional farm to organic production, he started seeing more earthworms in the soil beneath his corn, soybeans, and wheat fields. By the third year, he had spotted numerous nightcrawlers—big worms reaching up to eight inches long—on his 700-acre farm in Green County, Ohio.

With conventionally farmed land, “anything synthetic is hurting the natural ecosystem of the soil,” said Ward, whose acreage is now largely certified organic. “As you transition away from that, the life comes back.”

By life, Ward means the rich diversity of insects and other soil invertebrates—earthworms, roundworms, beetles, ants, springtails, and ground-nesting bees—as well as soil bacteria and fungi. Rarely do conversations about the negative impacts of pesticide use in agriculture include these soil invertebrates, yet they play a vital role in soil and plant health and sequestering carbon.

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