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Weed Suppression in Cover Crop Monocultures and Mixtures

  • Barbara Baraibar (a1), Mitchell C. Hunter (a1), Meagan E. Schipanski (a2), Abbe Hamilton (a1) and David A. Mortensen (a1)...
Abstract

Interest in planting mixtures of cover crop species has grown in recent years as farmers seek to increase the breadth of ecosystem services cover crops provide. As part of a multidisciplinary project, we quantified the degree to which monocultures and mixtures of cover crops suppress weeds during the fall-to-spring cover crop growing period. Weed-suppressive cover crop stands can limit weed seed rain from summer- and winter-annual species, reducing weed population growth and ultimately weed pressure in future cash crop stands. We established monocultures and mixtures of two legumes (medium red clover and Austrian winter pea), two grasses (cereal rye and oats), and two brassicas (forage radish and canola) in a long fall growing window following winter wheat harvest and in a shorter window following silage corn harvest. In fall of the long window, grass cover crops and mixtures were the most weed suppressive, whereas legume cover crops were the least weed suppressive. All mixtures also effectively suppressed weeds. This was likely primarily due to the presence of fast-growing grass species, which were effective even when they were seeded at only 20% of their monoculture rate. In spring, weed biomass was low in all treatments due to winter kill of summer-annual weeds and low germination of winter annuals. In the short window following silage corn, biomass accumulation by cover crops and weeds in the fall was more than an order of magnitude lower than in the longer window. However, there was substantial weed seed production in the spring in all treatments not containing cereal rye (monoculture or mixture). Our results suggest that cover crop mixtures require only low seeding rates of aggressive grass species to provide weed suppression. This creates an opportunity for other species to deliver additional ecosystem services, though careful species selection may be required to maintain mixture diversity and avoid dominance of winter-hardy cover crop grasses in the spring.

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*Corresponding author’s E-mail: bub14@psu.edu
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Associate Editor for this paper: John L. Lindquist, University of Nebraska.

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References
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Akemo, M, Regnier, E, Bennett, M (2000) Weed suppression in spring-sown rye (Secale cereale)–pea (Pisum sativum) cover crop mixes. Weed Technol 14:545549
Björkman, T, Lowry, C, Shail, JW Jr, Brainard, DC, Anderson, DS, Masiunas, JB (2015) Mustard cover crops for biomass production and weed suppression in the Great Lakes region. Agron J 107:12351249
Brainard, DC, Bellinder, RR, Kumar, V (2011) Grass–legume mixtures and soil fertility affect cover crop performance and weed seed production. Weed Technol 25:473479
Brennan, EB, Smith, RF (2005) Winter cover crop growth and weed suppression on the central coast of California. Weed Technol 19:10171024
Creech, JE, Webb, JS, Young, BG, Bond, JP, Harrison, SK, Ferris, VR, Faghihi, J, Westphal, A, Johnson, WG (2007) Development of soybean cyst nematode on henbit (Lamium amplexicaule) and purple deadnettle (Lamium purpureum). Weed Technol 21:10641070
DeHaan, LR, Weisberg, S, Tilman, D, Fornara, D (2010) Agricultural and biofuel implications of a species diversity experiment with native perennial grassland plants. Agric Ecosyst Environ 137:3338
Dorn, B, Jossi, W, Van der Heijden, MGA (2015) Weed suppression by cover crops: comparative on-farm experiments under integrated and organic conservation tillage. Weed Res 55:586597
Duiker, S, Curran, B (2007) Management of Red Clover as a Cover Crop. PennState Extension Agronomy Facts 67. https://extension.psu.edu/management-of-red-clover-as-a-cover-crop. Accessed December 27, 2015
Finney, DM, White, CM, Kaye, JP (2015) Biomass production and carbon/nitrogen ratio influence ecosystem services from cover crop mixtures. Agron J 108:3952
Hamilton, A (2016) Maximizing the On-Farm Benefits of Cover Crops: Comparing Management Intentions and Ecosystem Service Provisioning. Master’s thesis. University Park, PA: Pennsylvania State University
Hayden, ZD, Brainard, DC, Henshaw, B, Ngouajio, M (2012) Winter annual weed suppression in rye–vetch cover crop mixtures. Weed Technol 26:818825
Hooper, DU, Chapin, FS, Ewel, JJ, Hector, A, Inchausti, P, Lavorel, S, Lawton, JH, Lodge, DM, Loreau, M, Naeem, S, Schmid, B, Setala, H, Symstad, AJ, Vandermeer, J, Wardle, DA (2005) Effects of biodiversity on ecosystem functioning: a consensus of current knowledge. Ecol Monogr 75:335
Hunter, J, Roth, G, Frier, MC (2010) Winter Canola in Pennsylvania: Production and Agronomic Recommendations. PennState Extension Agronomy Facts 74. http://extension.psu.edu/plants/crops/grains/small/production/winter-canola-in-pennsylvaniaproduction-and-agronomic-recommendations/extension_publication_file. Accessed: December 27, 2015
Kato-Noguchi, H, Kosemura, S, Yamamura, S, Mizutani, J, Hasegawa, K (1994) Allelopathy of oats. I. Assessment of allelopathic potential of extract of oat shoots and identification of an allelochemical. J Chem Ecol 20:309314
Knops, JMH, Tilman, D, Haddad, NM, Naeem, S, Mitchell, CE, Haarstad, J, Ritchie, ME, Howe, KM, Reich, PB, Siemann, E, Groth, J (1999) Effects of plant species richness on invasion dynamics, disease outbreaks, insect abundances and diversity. Ecol Lett 2:286293
Koike, ST, Smith, RF, Jackson, LE, Wyland, LJ, Inman, JI, Chaney, WE (1996) Phacelia, Lana woollypod vetch, and Austrian winter pea: three new cover crop hosts of Sclerotinia minor in California. Plant Dis 80:14091412
O’Connell, SO, Grossman, JM, Hoyt, GD, Shy, W, Bowen, S, Marticorena, DC, Fager, KL, Creamer, NG (2014) A survey of cover crop practices and perceptions of sustainable farmers in North Carolina and the surrounding region. Renew Agric Food Syst 30:550562
Lawley, YE, Teasdale, JR, Weil, RR (2012) The mechanism for weed suppression by a forage radish cover crop. Agron J 104:205214
Lawson, A, Cogger, C, Bary, A, Fortuna, AM (2015) Influence of seeding ratio, planting date and termination date on rye-hairy vetch cover crop mixture performance under organic management. PLoS ONE 10:e0129597. doi: 10.1371/journal.pone.0129597
Lithourgidis, AS, Dordas, CA, Damalas, CA, Vlachostergios, DN (2011) Annual intercrops: an alternative pathway for sustainable agriculture. Aust J Crop Sci 5:396410
Loreau, M, Naeem, S, Inchausti, P, Bengtsson, J, Grime, JP, Hector, A, Hooper, DU, Huston, MA, Raffaelli, D, Schmid, B, Tilman, D, Wardle, DA (2001) Biodiversity and ecosystem functioning: current knowledge and future challenges. Science 294:804808
McCauley, A, Miller, P, Holmes, J, Burgess, M, Jones, C (2012) Improving Annual Legume Green Manure Management by Optimizing Seeding Rate and Termination Timing. Montana State University Fertilizer Facts 61. http://landresources.montana.edu/fertilizerfacts/documents/FF61AnnLegGrnManSeedRateTermTime.pdf. Accessed December 27, 2015
Mirsky, SB, Curran, WS, Mortensen, DA, Ryan, MR, Shumway, DL (2011) Timing of cover-crop management effects on weed suppression in no-till planted soybean using a roller-crimper. Weed Sci 59:380389
Murrell, E, Schipanski, ME, Finney, DM, Hunter, MC, Burgess, M, LaChance, JC, Baraibar, B, White, CM, Mortensen, DA, Kaye, JP (2017) Achieving diverse cover crop mixtures: effects of planting date and seeding rate. Agron J 109:113
Nord, EA, Ryan, MR, Curran, WS, Mortensen, DA, Mirsky, SB (2012) Effects of management type and timing on weed suppression in soybean no-till planted into rolled-crimped cereal rye. Weed Sci 60:624633
Norsworthy, JK, Ward, SM, Shaw, DR, Llewellyn, RS, Nichols, RL, Webster, TM, Bradley, KW, Frisvold, G, Powles, SB, Burgos, NR, Witt, WW, Barrett, M (2012) Reducing the risks of herbicide resistance: best management practices and recommendations. Weed Sci 60:3162
Ryan, MR, Mirsky, SB, Mortensen, DA, Teasdale, JR, Curran, WS (2011) Potential synergistic effects of cereal rye biomass and soybean planting density on weed suppression. Weed Sci 59:238246
Schulz, M, Marocco, A, Tabaglio, V, Macias, FA, Molinillo, JM (2013) Benzoxazinoids in rye allelopathy—from discovery to application in sustainable weed control and organic farming. J Chem Ecol 39:154174
Singer, JW, Nusser, SM, Alf, CJ (2007) Are cover crops being used in the US Corn Belt? J Soil Water Conserv 62:353358
Smith, RG, Atwood, LW, Warren, ND (2014) Increased productivity of a cover crop mixture is not associated with enhanced agroecosystem services. PLoS ONE 9:e97351
Sustainable Agriculture Research and Education (2015) 2014–2015 Annual Report Cover Crops Survey (SARE) Program. http://www.sare.org/Learning-Center/From-the-Field/North-Central-SARE-From-the-Field/2015-Cover-Crop-Survey-Analysis. Accessed February 22, 2016
Teasdale, JR, Mirsky, SB (2015) Tillage and planting date effects on weed dormancy, emergence, and early growth in organic corn. Weed Sci 63:477490
Tilman, D (1999) The ecological consequences of changes in biodiversity: a search for general principles. Ecology 80:14551474
USDA Natural Resources Conservation Service (2009) Understanding Seeding Rates, Recommended Planting Rates, and Pure Live Seed (PLS). Alexandria, LA: USDA-NRCS Plant Materials Technical Note 11:14 http://www.nrcs.usda.gov/Internet/FSE_PLANTMATERIALS/publications/lapmctn9045.pdf. Accessed May 2017
White, C, Barbercheck, M, Dupont, T, Finney, D, Hamilton, A, Hartman, D, Hautau, M, Hinds, J, Hunter, M, Kaye, J, LaChance, J (2015) Making the most of mixtures: Considerations for winter cover crops in temperate climates. eXtension. http://articles.extension.org/pages/72973/making-the-most-of-mixtures:-considerations-for-winter-cover-crops-in-temperate-climates#.VW8FDxffZB8. Accessed December 27, 2015
White, CM, DuPont, ST, Hautau, M, Hartman, D, Finney, DM, Bradley, B, LaChance, JC, Kaye, JP (2017) Managing the tradeoff between nitrogen supply and retention with cover crop mixtures. Agric Ecosyst Environ 237:121133
Wilson, ML, Baker, JM, Allan, DL (2013) Factors affecting successful establishment of aerially seeded winter rye. Agron J 105:18681877
Wisler, GC, Norris, RF (2005) Interactions between weeds and cultivated plants as related to management of plant pathogens. Weed Sci 53:914917
Wortman, SE, Francis, CA, Bernards, ML, Drijber, RA, Lindquist, JL (2012) Optimizing cover crop benefits with diverse mixtures and an alternative termination method. Agron J 104:14251435
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Weed Science
  • ISSN: 0043-1745
  • EISSN: 1550-2759
  • URL: /core/journals/weed-science
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