Mind the gap.

Highlights from the article: A 65-year comparative analysis between U.S. yields of irrigated and rainfed crops has sounded a message to farmers, land managers and policymakers: Mind the gap. The unique growing season of winter wheat meant that its yields rose only 25% with irrigation, the smallest gain among the nine crops. By contrast, Irmak conceded that he regularly encounters irrigation-related pushback from colleagues who study environmental issues, including irrigation's role in ferrying nitrogen and other fertilizer components into groundwater.