| http://www.w3.org/ns/prov#value | - U.S. Pat. No. 4,867,192, issued to Terrell et al., discloses the use of a selective liquid fertilizer blending system and apparatus associated with golf courses utilizing automatic irrigation systems, to irrigate the various species of turf grasses used on fairways, tees, greens and other areas, which includes devices for monitoring and adjusting the pH of the irrigation water.
|
