Soil Water Storage During Fallow in the Central Great Plains as Influenced by Tillage and Herbicide Treatments
1968
Smika, D. E. | Wicks, G. A.
Soil water storage during the fallow period of winter wheatsorghum-fallow (Triticum aestivum and Sorghum vulgare) and alternate winter wheat-fallow rotations was measured during three fallow periods. Storage was greater when herbicides rather than conventional tillage practices were used to control weeds. The storage increase of nearly 4 cm of available water as a result of treatments was distributed throughout the profile in the 3-year rotation, but the greatest increase occurred in the upper 60 cm of soil. In the 2-year rotation the nearly 14-cm increase in available water due to treatment was also present in the entire profile, but most of the storage increase occurred to a depth of 210 cm, with soil water content to a depth of 180 cm being at or near field capacity. Soil water storage for the total fallow period of the 3-year rotation ranged from 18.6 to 22.3 cm, having corresponding storage efficiencies of 35.4 and 42.4%, for conventional tillage and complete herbicide treatments, respectively. Water storage for the complete fallow period of the 2-year rotation ranged from 18.6 cm with spring plowing (bare soil) to 23.8 cm with tillage stubble mulch to 32.5 cm with complete use of herbicides, and had storage efficiences of 25.0, 32.0, and 43.7%, respectively.
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