- Nelson Irrigation Time Center Pivot Irrigation Solid Set / Permanent Set Irrigation Tree & Vine Irrigation Nursery & Greenhouse Irrigation Traveler Irrigation / Big Guns SEARCH OUR SITE Welcome to Nelson Irrigation Online. Nelson Irrigation Corporation is headquartered in Walla Walla, Washington, USA. We plan, design, develop, manufacture and sell proprietary products for the agricultural ...www.nelsonirrigation.com