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Effect of Soil Heating on Winter Growth and Appearance of Bermudagrass and St. Augustinegrass¹

Three selections of bermudagrass and common St. Augustinegrass were evaluated for their response to soil warming during the winter period. Ratings obtained for common St. Augustinegrass were generally superior to those obtained for bermudagrass. The response of bermudagrass was variable with more uniform response and acceptable appearance being obtained at the more southernly located experimental sites. Both ‘Tifgreen’ and ‘Gene Tift’ were more responsive than P-16 bermudagrass (Kansas selection) to soil warming. A more acceptable appearance and better response was obtained when mowing heights were reduced for the bermudagrasses studied.

Two types of cable, a commercial polyvinyl heating cable and an uninsulated No. 9 galvanized wire, were satisfactory for use. No differences were noted in grass response to placement of cables at varying depths up to 23 cm (9-inches) under the experimental conditions. Air sensing thermostats gave better control than soil sensing thermostats.

Key Words: winter turf

² Assistant Professor, Department of Soil and Crop Sciences; Professor and Instructor, Department of Agricultural Engineering, Texas A&M University.

Received for publication October 2, 1967.