Out here the water comes up from the Ogallala, and a green lawn in Yuma is a small act of devotion. A&A Platinum Turf & Landscaping LLC keeps that promise best in June, when the sprinklers tick over at dusk and the smell of cut grass hangs in air still warm from the afternoon. The work is mowing, trimming and edging, feeding and aerating the turf, overseeding the thin spots, and staying after the weeds that drift in off the section lines. What it adds up to is a yard that reads clean from the curb — a crisp line where blade meets concrete, the stripes lying flat under the last of the light. Around Yuma, Eckley, Wray and Otis, that band of green against the high-plains brown is worth every pass.