Monday, 7 November 2005
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Mitigating Soil Compaction from Winter-Annual Grazing in a Cotton-Peanut Rotation: Tillage and Forage Choice.

Guillermo Siri-Prieto1, D. Wayne Reeves2, Randy L. Raper2, and Brian Gamble3. (1) Produción Vegetal Universidad de la República Uruguay, Ruta 3 km 363, CP 6000, Paysandu, Uruguay, (2) USDA-ARS, J. Phil Campbell Sr. Natural Resource Conservation Center, 1420 Experiment Station Rd., Watkinsville, GA 30677, (3) Agronomy & Soils Department , Auburn University, Wiregrass Research and Extension Center, P.O. Box 217, Headland, AL 36345

Cotton (Gossypium hirsutum L.) and peanut (Arachis hypogaea L.) producers in the southeastern USA are interested in rotation systems that include winter-annual grazing but are concerned about resulting soil compaction. We conducted a 3-y field study on a Dothan loamy sand (fine-loamy, kaolinitic, thermic Plinthic Kandiudults) to develop a tillage system for integrating winter-annual grazing in a cotton-peanut rotation that increases profitability without degrading soil physical properties. Winter-annual forages and tillage systems were evaluated in a strip plot design with four replications. Forages (horizontal plots) were oat (Avena sativa L.) and ryegrass (Lolium mutiflorum L.). Tillage systems (vertical plots) included: moldboard and chisel plow; and combinations of non-inversion deep tillage (none, in-row subsoiling or paratilling) with and without surface tillage (disk/level). We evaluated cone index, infiltration, soil water content (0-30cm), and cotton/peanut yields. Forage species did not affect soil strength. Grazing increased soil compaction to the 10-cm depth, but tillage (conventional surface tillage or non-inversion deep tillage) reduced compaction and increased soil water removal by cotton/peanut compared to strict no-tillage. Peanut soil water extraction and yield were greater (7% and 21%, respectively) following grazed oat than ryegrass. Strict no-tillage resulted in the lowest infiltration (36% of water applied) and lowest cotton/peanut yields. Greatest infiltration and highest yields were obtained using conservation systems including non-inversion deep tillage without surface tillage. Producers in the region can integrate winter-annual grazing with cotton/peanut using non-inversion deep tillage in conservation tillage systems without sacrificing yields.

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