|Siri-Prieto, G - UNIV DE LA REP URUGUAY|
|Gamble, B - AUBURN UNIVERSITY|
Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: August 9, 2005
Publication Date: November 6, 2005
Citation: Siri-Prieto, G., Reeves, D.W., Raper, R.L., Gamble, B. 2005. Mitigating soil compaction from winter-annual grazing in a cotton-peanut rotation: tillage and forage choice [abstract]. ASA-CSSA-SSSA Annual Meeting. CD-ROM. Technical Abstract: Cotton (Gossypium hirsutum L.) and peanut (Arachis hypogaea L.) producers in the southeastern USA are interested in winter-annual grazing but are concerned about resulting soil compaction by cattle. We conducted a 3-y field study on a Dothan loamy sand (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.