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Increasing Water Use and Water Use Efficiency in Dryland Wheat

CSIRO Plant Industry, GPO Box 1600, Canberra, 2601, Australia

View larger version (14K): [in a new window]   Fig. 1. Relationship between wheat yield and water use from experiments conducted by French and Schultz (1984). The points represent yields measured in experiments conducted over many seasons and locations. The line represents the highest transpiration efficiency (TE) observed, and the intercept on the abscissa represents soil evaporation (Es). The vertical lines join data points representing different crop management treatments at a single experiment

View larger version (13K): [in a new window]   Fig. 2. Relationship between reported mean wheat yields in the Shire of Wagga Wagga for 1950 through 1992 in relation to growing-season rainfall and yields simulated by the SIMTAG model. The line represents the same transpiration efficiency (TE) and soil evaporation (Es) shown in Fig. 1

View larger version (29K): [in a new window]   Fig. 3. Soil profiles of (a) water content and (b) matric potential measured at sowing and maturity of wheat growing at Pucawan, Australia at two levels of applied N. The matric potential data are as presented by van Herwaarden et al. (1998a), and the previously unpublished soil water data refer to the same samples. The total water content in each profile is also shown in (a) along with the least significant differences between them

View larger version (31K): [in a new window]   Fig. 4. (a) Class A pan evaporation and (b) vapor pressure deficit (VPD) for daylight during the growing season of wheat at Temora, Australia in 1991