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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].
