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This article in CS

  1. Vol. 10 No. 1, p. 1-2
     
    Received: Apr 17, 1969
    Published: Jan, 1970


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doi:10.2135/cropsci1970.0011183X001000010001x

Efficiency of Water Use and Seedling Drougth Tolerance of Boer Lovergrass, Eragrostis curvula Nees1

  1. L. Neal Wright and
  2. A.K. Dobrenz2

Abstract

Abstract

Efficiency of water use of five selections of boer lovegrass, Eragrostis curvula Nees (equals E. chloromelas Steud.), was determined under greenhouse and growth chamber environments at Tucson, Ariz. These apomictic selections, which represented extremes for seedling drouth tolerance, were evaluated as seedlings and as mature plants. Significant differences in water-use efficiency, measured as the number of units of water transpired per unit of dry matter produced, were found among selections within environments. Water-use efficiency values were lower for seedling than mature plants, yet relative ranking of selections did not change within stages of maturity. Selections with highest water use were most seedling drouth tolerant. A correlation coefficient of r = .80 indicated a significant negative association between seedling water-use efficiency and seedling drouth tolerance. The same association was shown for seedling drouth tolerance and mature-plant water-use efficiency.

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