Quantitative measurement of sod strength has been reported previously in the literature and is typically related to the force required to shear a strip of sod into two separate pieces. Several devices have been designed to quantitatively measure sod shear strength (Burns and Futral, 1980; Goatley et al., 1997; Parish, 1995; Rieke et al., 1968; Sharpe et al., 1989; Shildrick, 1982; Sorochan and Rogers, 2000). These devices, or modifications based on them, have constituted the majority of studies where sod strength has been reported (e.g., Agnew and Christians, 1992; Cutulle et al., 2013; Giese et al., 1997; Hall, 1980; Hall et al., 1985; Hall and Bingham, 1993; Hurley and Skogley, 1975; Li et al., 2011; McCalla et al., 2008; Rieke and Beard, 1969; Ruemmele et al., 2001; Shearman et al., 2001; Taylor and Schmidt, 1980).
Although a quantitative measurement of sod strength can be made and related to specific treatment effects (e.g., N rate, growth regulators, species, and cultivar comparisons, etc.), there is limited information as to what constitutes an acceptable to preferred value or range of sod strength measurements. Before shear-strength assessment can become a routine tool for sod management, benchmark values need to be established for these devices that indicate when sod is at or within an acceptable to optimum shear strength range for harvesting and handling. Once these values or ranges are established, producers may be more willing to consider devices that quantitatively measure sod strength, and use them to guide their management practices in achieving the optimum strength of sod at harvest. In addition, having an objective measure of shear strength would give a higher degree of criteria on judging acceptability to meet a contract or to resolve contract disputes about sod quality.
The objective of this research was to determine if any relationship exists between subjective producer assessment of sod strength and quantitative measurements of strength obtained from a device that records peak shear force. If a relationship could be obtained, then a further objective was to establish ranges of quantitative measurements that matched producer subjective assessments of acceptable to preferred sod strength for harvesting and handling.
Cutulle, M.A., Derr, J.F., McCall, D., Horvath, B. & Nichols, A.D. 2013 Impact of hybrid bluegrass and tall fescue seeding combinations on brown patch severity and weed encroachment HortScience 48 493 500
Giese, M.S., Gaussoin, R.E., Shearman, R.C. & Riordan, T.P. 1997 Sod production characteristics of turf-type Buchloë dactyloides Intl. Turfgrass Soc. Res. J. 8 455 465
Goatley, J.M. Jr, Smith, D.B., Gerard, P.D. & Coats, G.E. 1997 Comparing sod strength parameters of warm-season turfgrasses using a hydraulically driven sod strength machine HortTechology 7 421 426
Hall, J.R. III 1980 Effect of cultural factors on tall fescue-Kentucky bluegrass sod quality and botanical composition. In: J.B. Beard (ed.) Proc. 3rd Intl. Turfgrass Res. Conf., Munich, West Germany. 11–13 July 1977. ASA, CSSA, SSSA, Madison, WI. p. 367–377
Hall, J.R. III & Bingham, S.W. 1993 Impact of growth regulators on Kentucky bluegrass sod management and installation parameters Intl. Turfgrass Soc. Res. J. 7 701 707
Hall, J.R. III, Taylor, L.H. & Shoulders, J.F. 1985 Sod strength and turfgrass quality of Kentucky bluegrass cultivars, blends and mixtures. In: F. Lemaire (ed.). Proc. 5th Intl. Turfgrass Res. Conf., Avignon, France. 1–5 July 1985. INRA, Paris. p. 807–820
Li, D.Y., Fang, W.J. & Han, L.B. 2011 Nitrogen fertilization influences shear strength and quality of Kentucky bluegrass sod grown on clay Agron. J. 103 751 755
McCalla, J. Jr, Richardson, M., Karcher, D., Landreth, J. & Patton, A. 2008 Sod production utilizing an improved seeded bermudagrass cultivar. Online. Appl. Turfgrass Sci. doi:10.1094/ATS-2008-0118-01-RS
Petrovic, M. 2008 Reducing nitrogen groundwater contamination from sod production on Long Island, NY. CUTT, Cornell University Turfgrass Times. 3:8–10, 12
Rieke, P.E. & Beard, J.B. 1969 Factors in sod production of Kentucky bluegrass. In: Proc. 1st Intl. Turfgrass Res. Conf., Harrogate, UK. 15–18 July 1969. Sports Turf Res. Inst., Bingley, Yorkshire, UK. p. 514–520
Rieke, P.E., Beard, J.B. & Hansen, C.M. 1968 A technique to measure sod strength for use in sod production studies, p. 60. In: 1968 Agronomy abstracts. ASA-CSSA-SSSA, Madison, WI
Ruemmele, B.A., Engelke, M.C., White, R.H. & Lehman, V. 2001 Alternate sod production method for zoysiagrass Intl. Turfgrass Soc. Res. J. 9 910 916
Sharpe, S.S., Dickens, R. & Turner, D.L. 1989 Herbicide effects on tensile strength and rooting of bermudagrass (Cynodon dactylon) sod Weed Technol. 3 353 357
Shearman, R.C., Turner, T.R., Morris, K.N., Gaussoin, R.E., Vaitkus, M.R. & Wit, L.A. 2001 Sod strength and lateral spread of Poa pratensis cultivars and experimental lines Intl. Turfgrass Soc. Res. J. 9 928 933
Sorochan, J.C. & Rogers, J.N. III 2000 Measuring sod strength of Kentucky bluegrass and supine bluegrass. TurfGrass Trends, July, p. 6–9
Taylor, L.H. & Schmidt, R.E. 1980 Differences in sod strength, rooting, and turfgrass quality of Kentucky bluegrass cultivars resulting from seasonal and environmental conditions. In: J.B. Beard (ed.). Proc. 3rd Intl. Turfgrass Res. Conf., Munich, West Germany. 11–13 July 1977. ASA, CSSA, and SSSA, Madison, WI. p. 31–38