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Dana Jokela and Ajay Nair

maximum weed suppression and reduced N immobilization, and 3) the ability of cover crop–based cropping systems to align with conservation tillage approaches. Challenges also exist in effective cover crop termination strategies in organic vegetable

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Guangyao Wang, Mathieu Ngouajio and Darryl D. Warncke

( Hoffmann et al., 1996 ). Cover crops and other soil organic amendments could also serve as enhancement strategies for onion production under short-term crop rotations. Benefits could include weed suppression ( Boyhan et al., 2006 ; Charles et al., 2006

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Alyssa H. Cho, Carlene A. Chase, Danielle D. Treadwell, Rosalie L. Koenig, John Bradley Morris and Jose Pablo Morales-Payan

, aided by various biotic and abiotic factors ( Rice, 1984 ). Scientists agree that allelopathy is an aspect of plant interference; however, there is a lack of consensus on the importance of allelopathy in weed suppression and information on the modes of

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Eric B. Brennan and Richard F. Smith

mustard population density, biomass production, plant height, nutrient concentration, and weed suppression. We expected that higher seeding rates would provide some benefits in furrow cover crops by increasing early-season biomass production, nutrient

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Caitlin E. Splawski, Emilie E. Regnier, S. Kent Harrison, Mark A. Bennett and James D. Metzger

preclude the use of pesticides, or the use of mechanical tillage because of a lack of space or financial resources for equipment and skilled labor. The recycling of urban wastes such as paper and plant trimmings for weed suppression in urban farms could

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James Ferguson, Bala Rathinasabapathi and Clinton Warren

experiments on weed suppression. Two field experiments were conducted between 1 Apr. and 15 Aug. 2005 and a third experiment between 1 June and 15 Aug. 2005 in a simulated container nursery on the University of Florida campus in Gainesville. Crape myrtle

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Stephanie Wedryk, Joel Felix, Doug Doohan and John Cardina

al., 2011 ). Weed suppression and grain yields in the first certified organic year can be affected by the species of cover crop used during 3 years of transition ( Smith et al., 2011 ). Transitional strategies of different agronomic crop rotations

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Jose G. Franco, Stephen R. King, Joseph G. Masabni and Astrid Volder

( Zea mays )–legume intercrop led to higher canopy cover and more efficient use of solar energy, thereby increasing weed suppression. Therefore, the ability of complex multilayered mixed cropping systems to maximize canopy density and increase radiation

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Jose Linares, Johannes Scholberg, Kenneth Boote, Carlene A. Chase, James J. Ferguson and Robert McSorley

( Bailey and Lazarovits, 2003 ). Successful weed suppression using summer CC has been reported for annual crops such as rice ( Oryza sativa L.) preceded by pigeon pea ( Cajanus cajan L.) as a CC ( Roder et al., 1998 ), and corn ( Zea mays L.) by using

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Daniel Schellenberg, Ronald Morse and Gregory Welbaum

Weed suppression and nitrogen (N) management present the greatest challenges to organic growers. Cover crops, the strategic use of tillage, and multiple nitrogen sources are being investigated in order to develop integrated management practices. Combinations of legume and grass cover crops are being utilized as alternative N sources and as tools for weed suppression. Another objective is to compare conventional and no-till practices to determine when the strategic use of tillage is most beneficial for N management and weed control. The last objective is to evaluate the fate of applied N and N released from cover decomposition on crop development. The best combinations of cover crop species, the frequency and intensity of tillage, and optimum N rates will be determined for the production of organic broccoli. This project will aid growers interested in transitioning to organic farming. In addition, integrated management practices that balance the short-term needs for crop productivity and the long-term interests of sustainable production will be reported.