http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Creeping bentgrass performance, water relations, and soil gas response to three irrigation frequencies in a hot-humid climate
Golf course superintendents in the southern United States need all the help they can get when managing bentgrass on sand-based profiles during stressful summer months. Help in the form of increased shoot and root density, minimal disease and algae occurrence, and proper irrigation frequencies and amounts are necessary. All of these factors contribute to the turf manager's ability to maintain acceptable levels of ted-quality and placability. Five creeping bentgrass cultivate were established on a USGA specification golf green in College Station, Texas. Three irrigation frequencies (1-day, 2-day, 4-day) were used to examine the effects of irrigation frequency on bentgrass performance and water relations. The objectives of this study were to determine the effects of irrigation frequency on shoot and root density, terror potential, soil 0₂ and CO₂, algae occurrence and turf quality of five creeping bentgrass cultivars. The 4-day irrigation treatment demonstrated greater shoot density, root length density, and root mass than did the 1-day and 2-day treatments in August of 1997 and 1998. There was no difference in turf quality among irrigation frequencies in 1998, however, due to increased algae formation in 1997, the 4-day treatment mainlined greater turf-quality in August of 1997. Crenshaw and L-93 were top performing cultisms regardless of irrigation frequency. A-4 and Marnier were intermediate with Penncross demonstrating the lowest performance in all categories. Soil 0₂ concentrations declined and CO₂ concentrations increased dramatically upon irrigation of the 4-day treatment. Fluctuation of O₂ and CO₂ concentrations resulted from root respiration response to greater irrigation amounts. Further examination of the effects of irrigation frequency on soil 0₂ and CO₂ concentrations in sand-based root zones could help golf course superintendents maintain soil profile gas balances more effectively. Photosynthate partitioning and soil 0₂ and CO₂ effects on bentgrass shoot and root response could also provide information to help turf managers maintain deeper, denser, and more prolific root systems.
Issued also on microfiche from Lange Micrographics.
Includes bibliographical references: pages 57-60.