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Estimating Plant-Available Water Using the Simple Inverse Yield Model for Claypan Landscapes

^a Dep. of Environmental Sci., 2323 Geology Bldg., Univ. of California, Riverside, CA 92521
^b 269 Agric. Eng. Bldg., USDA-ARS, Cropping Systems and Water Quality Research Unit, Columbia, MO 65211
^c 302 ABNR Bldg., Dep. of Soil, Environmental and Atmospheric Sci., Univ. of Missouri, Columbia, MO 65211

View larger version (24K): [in this window] [in a new window]   Fig. 1. Cumulative daily precipitation from April to September, along with 30-yr cumulative daily averages (1975–2004) obtained near the study site. The x-axis labels are day of year.

View larger version (19K): [in this window] [in a new window]   Fig. 2. Corn grain yield as a function of mean day-time vapor pressure deficit (VPD) before tasseling, after tasseling, and for the whole growing season, during the study period.

View larger version (22K): [in this window] [in a new window]   Fig. 3. Simulated corn grain yield using the simple inverse yield model (SIYM) as a function of profile plant-available water (PAW) for each individual year.

View larger version (21K): [in this window] [in a new window]   Fig. 4. Estimated plant-available water (PAW) for each individual year using the simple inverse yield model (SIYM PAWyear) vs. measured profile plant-available water for a 1.2-m soil profile (PAW1.2).

View larger version (27K): [in this window] [in a new window]   Fig. 5. Plant available water capacity estimated by the simple inverse yield model (SIYM PAWc) vs. measured plant available water to a 1.2-m depth (PAW1.2). The SIYM PAWc for Field 1 was obtained by averaging SIYM PAW estimates for 1997, 1999, and 2003. The SIYM PAWc for Field 2 was obtained by averaging SIYM PAW estimates for 1997, 2002, and 2005. The dashed circle indicates the data points with the largest underestimation errors.