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Nitrogen Fertilization and Mowing Height Effects on Tensile Strength of Bermudagrass Sod¹

The influence of N fertilization practices and mowing management on sod formation is of interest because both are important economic inputs in commercial sod production. Field experiments were conducted to determine the effects of mowing height, rate, and frequency of N applications on the sod tensile strength of ‘Tifway’ and ‘Tifgreen’ bermudagrass (Cynodon dactylon L. Pers. x C. transvaalensis Burt-Davy) grown on a Marvyn sl (typic Hapludult).

Results of the 3-year study showed that N rates of 0.25 kg/are produce sod tensile strengths equal or superior to those obtained from rates as high as 1.0 kg/are. Applications of N made at 2-week intervals produced sods with lower tensile strength than when applications were spaced 4 weeks apart. There were no significant interactions between N rates and application intervals. Both cultivars responded similarly; however, sod strengths for Tifway ranged from 30 to 50% greater than for Tifgreen in all tests. Varying mowing height from 1.25 to 2.50 an did not materially affect sod strength of either cultivar.

Key Words: Cynodon dactylon x C. transvaalensis • Sod-producing • Turfgrass • Sod strength

² Former graduate assistant (now landscape engineer, Alabama Highw. Dep., Montgomery) and associate professor of turf management, respectively.

Received for publication August 25, 1978.