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Modification of a Crop-Specific Drought Index for Simulating Corn Yield in Wet Years

^a High Plains Regional Climate Center, Univ. of Nebraska, Lincoln, NE 68583-0728
^b Current address: Texas Inst. for Appl. Environ. Res., Tarleton State Univ., Stephenville, TX 76402

View larger version (14K): [in a new window]   Fig. 1. Distribution of COOP stations used in the study in eastern Nebraska and southeastern Minnesota.

View larger version (13K): [in a new window]   Fig. 2. The time trace of soil water in the root zone in 1993 for Mead, NE. Wilting point (thin line) is the value of soil water below which the plants cannot extract moisture through the root system. Field capacity (thick line) is the level of soil water that is reached when the saturated soil is allowed to drain for a few days with no new rainfall, irrigation, or significant evapotranspiration. The real-time soil moisture (broken line) is estimated by Eq. [2].

View larger version (16K): [in a new window]   Fig. 3. Comparison between CSDI (Crop-Specific Drought Index) and CSSI (Crop-Specific Stress Index) during 1971–2002 in northeastern Nebraska.