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Emily K. Dixon, Bernadine C. Strik and David R. Bryla

continue the work by Harkins et al. (2013 , 2014 ) and Dixon et al. (2015a , 2015b ) and examine the effects of cultivar (Black Diamond and Marion), postharvest irrigation, weed management (weed mat, hand-weeded, and nonweeded), and primocane training

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Emily K. Dixon, Bernadine C. Strik and David R. Bryla

., 2013 ; Meyers et al., 2014 ). Weed mat, or porous landscape fabric, has been used successfully to manage weeds in various production systems ( Dixon et al., 2015 ; Harkins et al., 2013 ; Makus, 2011 ; Meyers et al., 2014 ). It is particularly well

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Renee H. Harkins, Bernadine C. Strik and David R. Bryla

contact herbicides are commonly used in conventional blackberry plantings ( Barney et al., 2007 ; Bushway et al., 2008 ), but chemical options are limited for organic production. Perforated landscape fabric, often referred to as weed mat, is an

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Bernadine C. Strik, Amanda Vance, David R. Bryla and Dan M. Sullivan

fish solubles ( Strik, 2016 ). Many were concerned with their weed management and fertilizer options, and they wondered whether alternative mulches such as weed mat were better than sawdust. Therefore, we initiated a long-term trial to address key

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Emily K. Dixon, Bernadine C. Strik, Luis R. Valenzuela-Estrada and David R. Bryla

remove them only before harvest. However, weeds compete with blackberry plants and can significantly reduce yield when left unmanaged ( Harkins et al., 2013 ; Meyers et al., 2014 ). The use of a perforated landscape fabric, or “weed mat,” as a barrier to

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Handell Larco, Bernadine C. Strik, David R. Bryla and Dan M. Sullivan

immobilization with organic fertilizer products. Weed mat (perforated landscape fabric) is considered an inert mulch ( Granatstein and Mullinix, 2008 ) and is approved for use as a weed barrier by the USDA National Organic Program ( USDA-AMS-NOP, 2011 ). Weed mat

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Bernadine C. Strik, Amanda Vance, David R. Bryla and Dan M. Sullivan

compost is readily available in many production regions and may be suitable for commercial blueberry production ( Sullivan et al., 2014 ). Weed mat (perforated landscape fabric) is approved for use as a weed barrier by the United States Department of

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James W. Julian, Bernadine C. Strik, Handell O. Larco, David R. Bryla and Dan M. Sullivan

10% of its total N during decomposition for several years after application ( Gale et al., 2006 ; Sikora and Szmidt, 2001 ). Weed mat or landscape fabric, an inert mulch ( Granatstein and Mullinix, 2008 ) approved for use as a weed barrier by the

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Handell Larco, Bernadine C. Strik, David R. Bryla and Dan M. Sullivan

extra fertilizer is a relatively minor expense in conventional systems, it is costly and often more difficult to apply when using organic products. Many organic growers are using weed mat as an alternative to sawdust. Weed mat is a woven, polyethylene

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Bernadine C. Strik, Amanda J. Vance and Chad E. Finn

amendment-mulch (“compost + sawdust”) and as a mulch (“weed mat”) at establishment (2006) and when the mulch needed replenishment (2011 and 2013, compost + sawdust treatment only) in an organic blueberry field at Oregon State University’s North Willamette