237-6 Reduced-Tillage Organic Corn Production in A Hairy Vetch Cover Cop.

See more from this Division: ASA Section: Land Management & Conservation
See more from this Session: Managing Cover Crops in the 21st Century: I
Tuesday, October 23, 2012: 12:05 PM
Duke Energy Convention Center, Room 206, Level 2
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Steven Mirsky1, John Teasdale1, John Spargo2, Michel Cavigelli1 and Jude Maul1, (1)USDA-ARS, Beltsville, MD
(2)Univ. of Massachusetts, Amherst, MA
There is interest in developing no-tillage systems for organic farming, however, potential limitations include the inability to control weeds and to provide sufficient crop available N. A 3-yr field experiment was conducted on organically-certified land to explore roller-crimper technology for terminating a hairy vetch (Vicia villosa Roth) cover crop in a reduced-tillage compared to a disk-tillage organic corn (Zea mays L.) production system in Maryland. Within this tillage comparison, factors including corn planting date and post-plant cultivation were examined for optimizing reduced-tillage organic corn production. Corn yield in roll-killed hairy vetch treatments where corn was planted before mid-June and that received high-residue cultivation was similar or higher than the best treatments with disk-killed hairy vetch. Delayed corn planting dates had little impact on corn yield in either disk- or roll-killed treatments, a result consistent with the similarity in weed biomass after cultivation, fertility, moisture, and radiation across planting dates. In 2 yr with supplemented weed populations, weed biomass was the major driver determining corn yield, which was reduced by 53 to 68% relative to weed-free control plots in the absence of post-plant cultivation, and by 21 to 28% with post-plant cultivation. In a year with low, natural weed populations, weeds had no significant influence on yield. These results demonstrate that organic corn production in a reduced-tillage roll-killed cover crop system can provide similar yields to those in a traditional tillage-based system, but also highlight the importance of maintaining low weed populations to optimize corn yield.
See more from this Division: ASA Section: Land Management & Conservation
See more from this Session: Managing Cover Crops in the 21st Century: I