The development of organic and conservation tillage-based vegetable production systems will offer growers in the southeastern United States new economic opportunities and promote resource conservation. The purpose of this research project was to assess the impact of incorporating a summer crop that serves as both cover crop and marketable hay crop in an organic fall vegetable production system. Sorghum sudangrass [Sorghum bicolor (L.) Moench X S. sudanense (Piper) Staph] is commonly cultivated as a forage crop in the Southeast and has the potential to produce abundant biomass, suppress weeds, and decrease soil compaction as a summer cover crop. Field studies were conducted to determine the effects of sorghum sudangrass cutting frequency and biomass removal as hay on cover crop biomass production, weed suppression by cover crop residues, and cover crop re-growth in a subsequent cabbage (Brassica oleracea L. var. capitata) crop under conventional and no-till management. Field and greenhouse studies were undertaken to identify potential negative interactions between cover crop residues and cabbage transplants. Transplant dry weight and head weight of the indicator species, cabbage, were used to assess the impact of cover crop management and tillage system on crop growth and development. Results suggest that a sorghum sudangrass hay crop can be harvested without compromising weed suppressive qualities of the cover crop. In this study, however, the presence of sorghum sudangrass led to reductions in cabbage transplant growth and head weight. Sorghum sudangrass may not be suitable as a cover crop immediately prior to conventional or no-till fall vegetable production due to its propensity to re-grow and allelopathic potential.
| Identifer | oai:union.ndltd.org:NCSU/oai:NCSU:etd-03282005-141749 |
| Date | 13 April 2005 |
| Creators | Finney, Denise McKinney |
| Contributors | Jonathan Schultheis, Michael Wagger, Nancy Creamer |
| Publisher | NCSU |
| Source Sets | North Carolina State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://www.lib.ncsu.edu/theses/available/etd-03282005-141749/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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