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Soil Water Depletion and Root Distribution of Three Dryland Crops

^a Dep. of Agricultural Research, Private Bag 0033, Gaborone, Botswana
^b USDA-ARS, Bushland, TX 79012
^c Retired), Dep. of Soil and Crop Sciences, Texas A&M Univ., College Station, TX 77843

View larger version (48K): [in a new window]   Fig. 1. Root length density (RLD) of crops for selected depths near the end of the 2000 and 2001 growing seasons. Error bars are ±1 SE. Note enlarged y-axis scale for cowpea. Days after planting (DAP).

View larger version (20K): [in a new window]   Fig. 2. Root length density (RLD) of cowpea, sorghum, and sunflower during the 2000 growing season under no tillage (NT) at selected soil depth increments. Error bars ( ±1 SE) are shown for the 0.05- to 0.1-m depth increment.

View larger version (52K): [in a new window]   Fig. 3. Soil water contents under cowpea, sorghum, and sunflower as a function of soil depth under no tillage (NT) and stubble mulch tillage (SMT) in 2000. Error bars for selected depths are ±1 SE of the mean change in water content between the first and last measurement times.

View larger version (52K): [in a new window]   Fig. 4. Soil water contents under cowpea, sorghum, and sunflower as a function of soil depth under no tillage (NT) and stubble mulch tillage (SMT) in 2001. Error bars for selected depths are ±1 SE of the mean change in water content between the first and last measurement times.

View larger version (42K): [in a new window]   Fig. 5. Daily water depletion rate [mm H2O (0.4 m soil depth)–1 d–1] for cowpea, sorghum, and sunflower at selected soil depths throughout the 2000 growing season. Error bars are ±1 SE of the mean water depletion rate for the depth increment 0.6 to 1.0 m.