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Water Requirement in Strains of Vine-Mesquite (Panicum obtusum H. B. K.)¹

A study of the water requirement of nine strains of vine-mesquite (Panicum obtusum H. B. K.) was conducted in the greenhouse for 126 days. Three herbage clippings were made. Least-squares analyses of dry herbage yield, transpiration, and water requirement (a ratio of transpiration to herbage yield) indicated no statistically significant differences among strains in either water requirement or herbage yield during any of the growth periods or in the whole experiment. However, there were significant differences in transpiration by the strains throughout the test. Although large and highly significant negative genetic correlations were obtained between herbage yield and water requirement, the lack of significant differences among strains in these two traits suggests that high herbage yield cannot be used with confidence as a guide in selecting for low water requirement in these accessions of vine-mesquite.

Key Words: Correlation • Herbage yield • Water-use efficiency • Transpiration

² Former Graduate Assistant and Associate Professor, respectively. Department of Agronomy, New Mexico State University.

Received for publication October 2, 1968.