Full TGIF Record # 14188
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Author(s):Sifers, S. I.; Beard, J. B.; Kim, K. S.
Author Affiliation:Sifers: Research Assistant, Turfgrass Physiology; Beard: Professor, Turfgrass Physiology; Kim: Technician, The Texas Agricultural Experiment Station, Department of Soil and Crop Sciences, College Station, Texas
Title:Criteria for visual prediction of low water use rates of bermudagrass cultivars
Other records with the "Turfgrass" Section
Source:Texas Turfgrass Research - 1986. May 1987, p. 22-23.
# of Pages:2
Publishing Information:College Station, TX: Texas Agricultural Experiment Station.
Keywords:TIC Keywords: Cynodon; Water use rate; Variety trials; Evapotranspiration rate; Leaf area; Visual evaluation
Abstract/Contents:Reports results of study conducted at Texas A&M University in 1985 to evaluate 24 bermudagrass cultivars for visual characteristics which would indicate lower water use rates. Actual evapotranspiration measurements were taken using the water balance method with minilysimeters. Visual ratings of predicted evapotranspiration rates were compared with minilysimeter readings and turf in field plots. Visual parameters used were canopy orientation, leaf extension, leaf width, and leaf/shoot density. These parameters were combined into a high canopy resistence-low leaf area concept, with the basic underlying premise that turfs with prostate canopy orientation, low leaf extension rates, narrow leaf widths, and high shoot densities would have low evapotranspiration rates. The visual estimates made by four observers (J.B. Beard, M.C. Engelke, G.L. Horst, and S.I. Sifers) were averaged and statistically compared to the actual evapotranspiration rates measured by the previously mentioned water balance method utilizing mini-lysimeters. The visual estimates correlated at a 75% accuracy level with the actual evapotranspiration rates with a range among observers of 83% to 62%. The observers were 81% accurate in identifying the six bermudagrass cultivars with the highest actual evapotranspiration rate and 81% accurate in identifying the six cultivars with the lowest actual evapotranspiration rate. Visual assessment using the high canopy resiitance-low leaf area concept provides a rapid, economical method for screening large numbers of mowed bermudagrass clonal plantings under field conditions for low water use rates.
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Sifers, S. I., J. B. Beard, and K. S. Kim. 1987. Criteria for visual prediction of low water use rates of bermudagrass cultivars. Tex Turfgrass Res. p. 22-23.
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