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Vapor Transport vs. Seed–Soil Contact in Wheat Germination

^a USDA-ARS, Columbia Plateau Conservation Res. Ctr., P.O. Box 370, Pendleton, OR 97801 USA

View larger version (24K): [in a new window]   Fig. 1 Soil water potential vs. water content for Walla Walla silt loam topsoil. Psychrometer measurements and regression from this experiment are plotted with data (from Pikul, 1987) generated using the three methods indicated

View larger version (25K): [in a new window]   Fig. 2 Number of days required for 80% germination of wheat seeds placed in contact with soil (vapor plus seed–soil: solid symbols) or separated from soil by fiberglass cloth (vapor only: open symbols) at four soil water potentials (-1.1, -0.57, -0.29, and -0.15 MPa) and six temperatures (3, 8, 13, 18, 23, and 28°C). Error bars show standard error of the mean

View larger version (18K): [in a new window]   Fig. 3 Effect of temperature and soil water potential on growing degree days (base = 0°C) required for 80% germination of wheat seed