Wednesday, November 7, 2007
309-1

Grazing Winter Cover Crops as a Management Option in a Conservation Tillage Cotton-Cover Crop System.

Harry Schomberg, Donald W. Reeves, Dwight S. Fisher, Randy L. Raper, Dinku M. Endale, and Michael B. Jenkins. J. Phil Campbell, Sr., Natural Resource Conservation Center, USDA-ARS, 1420 Experiment Station Rd., Watkinsville, GA 30677-2373

Cover crops are often viewed as an added expense by cotton producers. Grazing of winter annual cover crops with cattle may offset costs and increase farm revenue. However compaction from cattle may also create a need for deep tillage. Identifying temporal and spatial management needs can help to maximize profits in mixed cropping and grazing systems. In fall 2005, we began research to evaluate grazing effects on conservation tillage cotton grown on Cecil soil (fine, kaolinitic, thermic, Typic Kanhapludult) at the USDA-ARS Research Center, Watkinsville, GA. The research was conducted on four long-term conservation systems watersheds. In the first year, cereal rye (Secale cereale L.) produced about 8958 kg ha-1 by mid April and provided approximately 4480 kg ha-1 of forage when grazed for 10 days (in mid April) with Angus heifers (Bos Taurus). Forage availability was estimated to be sufficient for 3.5 cows ha-1 between February 1st and April 15th. Cool weather following planting of cotton delayed germination and growth. Seed cotton yields ranged from 2396 kg ha-1 to 3303 kg ha-1 based on yield monitor data. No differences in yield were detected between grazed and ungrazed fields (both treatments averaged approximately 2800 kg ha-1). After ginning, our yield per ha averaged 1130 kg ha-1 (2.1 bales ac-1). These preliminary results indicate grazing cover crops may be a viable option for cotton producers in the Southern Piedmont because of the potential to increase revenues from grazing without reducing cotton yields.