@article{vann_reberg-horton_brinton_2016, title={Row spacing and seeding rate effects on canola population, weed competition and yield in winter organic canola production}, volume={108}, ISSN={["1435-0645"]}, DOI={10.2134/agronj2016.02.0097}, abstractNote={Increasing seeding rate and widening row spacing to allow for between row cultivation may reduce weed competition in organic canola (Brassica napus L.) production. Research was conducted to evaluate the effects of row spacing and seeding rate on canola population, weed competition, and yield in organic canola production. Canola variety Hornet was planted at five seeding rates (3.4, 6.7, 10.1, 13.4, and 16.8 kg ha−1) at three row spacings (17, 34, 68 cm) in Goldsboro, Kinston, and Salisbury, NC, in 2011 and 2012. Between row cultivation was performed in the 68‐cm row spacing as weather permitted. Canola population increased with increasing seeding rate across all row spacings, and canola populations were highest with the 17‐cm row spacing, followed by the 34‐ then 68‐cm row spacings. Yield was similar across row spacings at the lower seeding rates in five of the six environments. At these environments, yield tended to increase in the 17‐cm row spacing as seeding rate increased but declined in the 68‐cm row spacing with increasing seeding rate. In one environment with a unique weed community, weed suppression and yield were higher with the 68‐cm row spacing. It was concluded that the yield plasticity of canola will provide producers flexibility in selecting row spacing, and seeding rate selections should be based on desired row spacing.}, number={6}, journal={Agronomy Journal}, publisher={American Society of Agronomy}, author={Vann, R.A. and Reberg-Horton, S.C. and Brinton, C.M.}, year={2016}, pages={2425–2432} }
 @article{wells_brinton_reberg-horton_2016, title={Weed suppression and soybean yield in a no-till cover-crop mulched system as influenced by six rye cultivars}, volume={31}, ISSN={["1742-1713"]}, DOI={10.1017/s1742170515000344}, abstractNote={Abstract}, number={5}, journal={RENEWABLE AGRICULTURE AND FOOD SYSTEMS}, author={Wells, M. Scott and Brinton, Carrie M. and Reberg-Horton, S. Chris}, year={2016}, month={Oct}, pages={429–440} }
 @article{parr_grossman_reberg-horton_brinton_crozier_2014, title={Roller-Crimper Termination for Legume Cover Crops in North Carolina: Impacts on Nutrient Availability to a Succeeding Corn Crop}, volume={45}, ISSN={["1532-2416"]}, DOI={10.1080/00103624.2013.867061}, abstractNote={Nitrogen (N) release from roll-killed legume cover crops was determined for hairy vetch (Vicia villosa Roth), crimson clover (Trifolium incarnatum L.), and a hairy vetch + rye (Secale cereale L.) biculture in an organic corn production system in North Carolina, USA. Cover crops were planted at two locations in fall 2008 and 2009, roll-killed in May, and no-till planted with corn (Zea mays L.). Inorganic soil N and mineral N flux were determined using potassium chloride (KCl) extractions and ion-exchange resin (Plant Root Simulator, PRS) probes at 2-week intervals for 12 weeks and compared to fertilized controls of 0 and 168 kg N ha−1. In 2009, greater plant available N under hairy vetch than under either 0 N control or crimson clover was found, with peak soil N occurring between 4 and 6 weeks after roll kill. Available soil N under crimson clover mulches was less than or equal to 0 N, suggesting net immobilization.}, number={8}, journal={COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS}, publisher={Informa UK Limited}, author={Parr, Mary and Grossman, Julie M. and Reberg-Horton, S. Chris and Brinton, Carrie and Crozier, Carl}, year={2014}, month={Apr}, pages={1106–1119} }
 @article{parr_grossman_reberg-horton_brinton_crozier_2011, title={Nitrogen Delivery from Legume Cover Crops in No-Till Organic Corn Production}, volume={103}, ISSN={["0002-1962"]}, DOI={10.2134/agronj2011.0007}, abstractNote={Sixteen winter annual cover crop cultivars were grown in North Carolina to determine total N accumulation, biological N fixation (BNF) potential, and compatibility with a roller‐crimper‐terminated organic corn (Zea maysL.) production system. Cover crops and termination dates were tested in a stripped block design. Treatments included hairy vetch (Vicia villosaRoth), common vetch (Vicia sativaL.), crimson clover (Trifolium incarnatumL.), Austrian winter pea (Pisum sativumL.), berseem clover (Trifolium alexandrinumL.), subterranean clover (Trifolium subterraneumL.), narrow leaf lupin (Lupinus angustifoliusL.), and Balansa clover (Trifolium michelianumSavi.), as well as bicultures of rye (Secale cerealeL.), hairy vetch, and Austrian winter pea. Roller‐crimper termination occurred in mid‐April, early May, and mid‐May. Total biomass, N concentration, and C/N ratios were determined for cover crops at all roll times and natural15N abundance at the optimal kill date. Hairy vetch and crimson clover monocultures had the greatest overall biomass in 2009, and bicultures the greatest biomass in 2010. Crimson clover successfully terminated in late April, hairy vetch and Austrian winter pea in mid‐May, and berseem clover and common vetch in late May. All cover crops except lupin and subterranean clover derived between 70 and 100% of their N from the atmosphere. Corn response to cover crop mulches was significantly affected by the time of rolling, with poor stands resulting from competition with insufficiently terminated mulches. Crimson, Balansa, and subterranean clover mulches resulted in poor corn yields despite relatively high levels of total N. The highest corn yields were achieved in hairy vetch and rye plus hairy vetch bicultures.}, number={6}, journal={AGRONOMY JOURNAL}, publisher={American Society of Agronomy}, author={Parr, M. and Grossman, J. M. and Reberg-Horton, S. C. and Brinton, C. and Crozier, C.}, year={2011}, pages={1578–1590} }