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Yield and Water-Use Efficiency of Eight Wheat Cultivars Planted on Seven Dates in Northeastern Oregon

^a Montana State Univ., Central Agric. Research Center, HC90 Box 20, Moccasin, MT 59462
^b Texas Agric. Exp. Stn., 2301 Experiment Station Rd., Bushland, TX 79012
^c Oregon State Univ., Columbia Basin Agric. Res. Center, P.O. Box 370, Pendleton, OR 97801
^d Oregon State Univ., Extension Service, Ballard Hall, Corvallis, OR 97331

View larger version (27K): [in a new window]   Fig. 1. Monthly precipitation recorded at the meteorological station at the Columbia Basin Agricultural Research Center for 1997, 1998, and 1999 cropping years.

View larger version (22K): [in a new window]   Fig. 2. (a) Mean daily atmospheric water vapor pressure deficit (MDA-VPD) calculated from daily maximum and minimum air temperatures at the Columbia Basin Agricultural Research Center, and (b) growing season mean daily water vapor pressure (GSMDA-VPD) calculated by dividing the sum of MDA-VPD to the days of the growing season. The VPD was calculated using equations in Campbell (1977).

View larger version (61K): [in a new window]   Fig. 3. Mean yields of four winter wheat cultivars at seven planting treatments. Data are from 1997, 1998, and 1999 experiments. The error bars in the graphs represent ±1 SE. Bars within each cultivar with same letters above indicate not significantly different based on Fisher's protected LSD (P < 0.1).

View larger version (62K): [in a new window]   Fig. 4. Mean yields of winter and spring wheat cultivars at each planting treatment from 3 through 7. Data are from 1997, 1998, and 1999 experiments. The error bars in the graphs represent ±1 SE. Bars within each planting treatment with same letters above indicate not significantly different based on Fisher's protected LSD (P < 0.05).

View larger version (30K): [in a new window]   Fig. 5. Plots of water-use efficiency vs. yield for fall-seeded (triangles) and spring-seeded (circles) in 1998 (solid symbols) and 1999 (open symbols).