> Lawns cover 40 million acres, or 2%, of land in the US, making them the single largest irrigated crop we grow.<p>That's comparing (an estimate of the) <i>total lawn area</i> to only the <i>irrigated portion of corn</i> (around 17% of the 91 million acres of corn in the US). If less than 40% of lawns are irrigated (which seems entirely plausible), then turfgrass is not the largest irrigated crop by any measure.<p>Total for total, corn has more. Irrigated for irrigated, lawns have more iff ~39% or more of the total area is irrigated. I doubt that 2/5ths of all lawn area is irrigated, but good statistics on that were not readily findable (and certainly not cited in the article).