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ization program, or by acidification of the irrigation water. In some cases, water with high residual sodium carbonate may require acidification with sulfuric, N-phuric acid (a type of urea-sulfuric acid), or phosphoric acids, or by use of a sulfur burner (which produces sulfurous acid). Amendments may be applied directly to the turfgrass/soil or injected into the irrigation system. Acidification of water by acid injection requires unique measurements and equipment. A turfgrass manager must work closely with a consulting laboratory to determine whether acidification is required and, if it is, how it may best be accomplished. There are many advantages to treating recycled water with direct injec- tion of amendments into the irrigation system, among which are: • More effective than surface application (gradual and frequent appli-
cation) • No disruption in site use Reduced labor • No dust problems • Reduced burn potential of sulfur • Reduced risk of "overdose" • Reduced pH and salinity fluctuations
www.stma.org
ADVERTISERS' INDEX Page #
Web Address 23 www.aerflo.com
39 www.sportsbuilders.org 52 www.barusa.com
32 www.beaconathletics.com 48 www.beamclay.com 17 www.covermaster.com 31 www.coversports.com/ST 11 www.deltabluegrass.com 21 www.diamondpro.com
9 www.proproducts.dupont.com /acelepryn
48 www.earth&turf.com 51 www.ewing1.com 33 www.1stproducts.com
2 www.graco.com/fieldmarking 15 www.hydraway.net
26-27 www.johnstonseed.com 37 www.naturalsand.com 41 www.newstripe.com 32 www.proschoice1.com 3 www.penningtonseed.com 29 www.turface.com 13 www.redexim.com 35 www.sodsolutions.com 48 www.SourceOneOPE.com 41 www.mulemix.com 45 www.stma.org
40 www.stablizersolutions.com 5, 48 www.toro.com 19 www.tifsport.com 48 www.turf-tec.com 25 www.turfco.com
48 www.TurfTimeEq.com 37 www.worldclasspaints.com
There are also potential disadvantages to direct injection: • Material more expensive • Equipment and maintenance expensive • Danger of handling acids • Irrigation efficiency and uniformity must be optimal • Segregation of areas is not possible (e.g., greens versus fairways in golf courses)
As human population grows and fresh water becomes increasingly
scarce, recycled water is a viable alternative to costly, limited potable water for irrigating turfgrass sites. Recycled water is often better tolerated by turf- grasses than by other landscape plants; simultaneously, turfgrass venues, with their large expanses and trained maintenance staffs, are particularly well-suited to incorporate recycled water in their irrigation programs. Urban population growth ensures an expansion of turfgrass sites for a vari- ety of recreational and functional uses, and this means that irrigation with Purple Gold will be a permanent part of our urban landscape schemes. ■
M. Ali Harivandi, PhD, is an extension specialist at the University of
California Cooperative Extension. This excerpt was reprinted with his permis- sion and that of Dr. Kimberly Erusha of the USGA Green Section.
SportsTurf 49
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