Investigation of cool-season species, seeding rate, and nitrogen fertilization in sod production: I. Establishment and sod tensile strength.

New regulations aimed at reducing soil erosion along with changing building and residential codes are increasing sod demand, especially low-input species, which are currently in very short supply and require research. Replicated field experiments were established in Indiana and Minnesota to quantify the effect of turfgrass species (strong creeping red fescue [Festuca rubra L. ssp. rubra Gaudin], Chewings fescue [F. rubra ssp. commutata Gaudin], tall fescue [F. arundinacea Schreb.], and Kentucky bluegrass [Poa pratensis L.]), seeding rate (1, 2, and 3 pure live seed cm^-2), and N fertilization (98, 196, and 294 kg N ha^-1 yr^-1) on the production, quality, and harvest limitations of sod. Sod strength and handling were measured at sod harvests from 11 to 24 months after planting (MAP). Results indicate that strong creeping red fescue produces quality sod, likely because of the fast establishment and rhizomatous growth habit, and had higher or similar sod strength as Kentucky bluegrass at optimum N rates. Optimum N rates for strong creeping red fescue were two to three times lower than Kentucky bluegrass. Chewings fescue had less sod strength than strong creeping red fescue but more than tall fescue, and at times similar to Kentucky bluegrass. Overall, turfgrass species had the largest effect on sod strength and handling, while seeding or N rates had less impact on sod strength, especially with fine fescues. Sod growers may be able to produce fine fescue sod with good sod strength using lower seeding and N rates, and shorter production periods. [ABSTRACT FROM AUTHOR]