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No-Till Corn Yields and Water Balance in the Mid-Atlantic Coastal Plain

^a Dep. of Crop and Soil Environ. Sci., Virginia Tech, Blacksburg, VA 24061-0404
^b Dep. of Soil and Crop Sci., Colorado State Univ., Fort Collins, CO

View larger version (40K): [in a new window]   Fig. 1. Soil water balance of the monitored profiles (1.2 m) as a function of day of year (DOY) during 1998 and 1999. Symbols represent measurements, and the lines joining the measurements are spline interpolation. Vertical step plots represent daily water balance as calculated using methods described in the text.

View larger version (11K): [in a new window]   Fig. 2. Plot of the relationship between crop stress factor (Ks) and the percentage of available soil water.

View larger version (23K): [in a new window]   Fig. 3. Soil water stress factor (Ks) as a function of day of year (DOY) for 1998 and 1999. Points are connected by spline interpolation.

View larger version (23K): [in a new window]   Fig. 4. Crop coefficients (Kc) as a function of day of year (DOY) in 1998 and 1999. Curves are cubic polynomials.

View larger version (30K): [in a new window]   Fig. 5. Cumulative actual evapotranspiration (Cum. ETa) as a function of day of year (DOY) in 1998 and 1999.

View larger version (32K): [in a new window]   Fig. 6. Plot of cumulative losses (drainage + surface runoff) as a function of day of year (DOY) in 1998.