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Variability of Barley Radiation-Use Efficiency

^a Biological Systems Engineering Dep., Washington State Univ., Pullman, WA 99164-6120
^b USDA-ARS, Washington State Univ., Pullman, WA 99164-6421

View larger version (38K): [in a new window]   Fig. 1. Fractional solar radiation interception of two cultivars of spring barley (Baronesse and Steptoe) in two seeding dates in the Year 2000 (panel A) and 2001 (panel B). In 2000 (2001), each point is the average of four (three) replications. Crops emerged on Day 131 (131) and 164 (173) in 2000 (2001) for the first and the second seeding date (dotted line), respectively.

View larger version (30K): [in a new window]   Fig. 2. Fractional solar radiation interception as a function of the plant area index (PAI) for the cultivars of spring barley Baronesse and Steptoe.

View larger version (32K): [in a new window]   Fig. 3. Cumulative biomass as a function of the intercepted solar radiation of two cultivars of spring barley (Baronesse and Steptoe) at two densities in two years (2000 panels A and B, 2001 panels C and D) and seeding dates (first seeding date panels A and C, second seeding date panels B and D). The slope of the relationship between the two variables is the radiation-use efficiency (e). Flowering occurred when crops reached biomass levels between 400 and 550 g m–2.

View larger version (23K): [in a new window]   Fig. 4. Temperature dependence of photosynthesis for the C3 species wheat, tomato (Lycopersicon esculentum Mill.), sugarbeet (Beta vulgaris L.) and Atriplex glabriuscula Edmonston. The line represents the temperature factor (fT) as presented in Eq. [3].

View larger version (26K): [in a new window]   Fig. 5. Radiation-efficiency (e) as a function of the daytime vapor pressured deficit of the air (D). Information includes data from this study and data gathered from the literature. Data of this study and Goyne et al. (1993) are for barley and the remaining information is for wheat. The unpublished data are for spring wheat cv. Hank and winter wheat cv. Falcon. The arrow indicates an outlier excluded from the regression (see text for explanation); if included the regression is e = 1.79 – 0.47D (r2 = 0.50, n = 23).