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Carol Miles, Lisa DeVetter, Shuresh Ghimire, and Douglas G. Hayes

Biodegradable plastic mulch was introduced in the 1990s as an alternative to PE mulch, which has been used in agriculture worldwide since the early 1960s to control weeds, conserve soil moisture, modify soil temperature, shorten time to harvest, and

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Jessica R. Goldberger, Lisa W. DeVetter, and Katherine E. Dentzman

; Steinmetz et al., 2016 ). Introduced in the 1990s, biodegradable plastic mulch is a potential alternative to PE mulch ( Kasirajan and Ngouajio, 2012 ; Miles et al., 2017 ; Sintim and Flury, 2017 ). Made from starch and other biodegradable polymers

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Kuan-Ju Chen, Suzette P. Galinato, Thomas L. Marsh, Peter R. Tozer, and Hayley H. Chouinard

Lynden, WA, in Nov. 2018. Specifically, we gave a presentation, “Biodegradable Plastic Mulches for Profitability in Agricultural Applications,” at both events. The first part of the presentation provided the background and key results of our two previous

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Jeremy S. Cowan, Debra A. Inglis, and Carol A. Miles

algae ( ASTM International, 2011a ). There have been numerous field studies investigating the effects of biodegradable plastic mulch on yield and crop quality ( Arméndariz et al., 2006 ; Candido et al., 2003 ; Martín-Closas et al., 2008 ; Miles et al

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David Wees, Philippe Seguin, Josée Boisclair, and Chloé Gendre

tree leaves and turfgrass clippings. Before planting, a 53-inch-wide, 0.6-mm-thick, black, biodegradable, plastic mulch (Bionov B Mater-Bi™; Récoltech Accessoires Maraichers Inc, Saint-Rémi, QC, Canada) was laid on the experimental plots, which were on

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Huan Zhang, Carol Miles, Shuresh Ghimire, Chris Benedict, Inga Zasada, Hang Liu, and Lisa DeVetter

spaced 3 m center-to-center, and each plot was 64 m long nested within a single row. The experimental area was 0.6 ha (90 m × 64 m) and spanned 30 rows within a field of ≈150 rows. Table 1. Polyethylene (PE) and biodegradable plastic mulches (BASF and

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Jenny C. Moore and Annette L. Wszelaki

Plasticulture systems with polyethylene (PE) mulch and drip tape are common for production of peppers (Capsicum annuum L.) in the United States because of their soil warming, moisture conservation, and other advantageous effects. However, disadvantages include disposal costs and plastic pollution of the environment and temperature stress in warm climates with black mulch. Use of biodegradable plastic mulches (BDMs) is becoming more common, as they provide the same benefits of PE mulch without the disposal problems. In 2017 and 2018, we conducted experiments in Knoxville, TN, comparing production of pepper fruit with five different BDM [one white-on-black (WOB) and four black], one black PE mulch, one brown creped, paper mulch, and bare ground control treatments. We also measured the durability and effectiveness of weed suppression of the different mulches over the growing season compared with a hand-weeded bare ground control. Most mulches were degraded, with 40% to 60% of the soil exposed by the end of the season, with the exception of the paper mulch, which was completely degraded at the end of both seasons. Yields were similar among treatments in 2017, with the exception of Naturecycle, which had the lowest yield. Weed pressure was severe, especially in 2018, largely due to early penetration of all mulches except paper by nutsedge. Due to the early and season-long weed pressure and heat stress in black mulches, there were fewer healthy plants in all black-colored mulch treatments in 2018, leading to reduced yields in these treatments. Paper mulch was the only treatment that prevented nutsedge growth; therefore, this treatment and the hand-weeded bare ground treatment had the greatest yields in 2018. WOB also had yields comparable with paper and bare ground plots in 2018, likely due to the cooling effect of the white mulch. The results suggest that in hot climates and in fields infested with nutsedge, paper mulches perform best for midseason pepper cultivation due to the cooling effects and superior weed control.

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salinity threshold value for rose of sharon in this study. However, rose of sharon was the most salinity tolerant species among the three landscape plants. Growers Assess Biodegradable and Polyethylene Plastic Mulches Biodegradable plastic mulch may be a

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Margarita Velandia, Karen L. DeLong, Annette Wszelaki, Susan Schexnayder, Christopher Clark, and Kimberly Jensen

:// > Goldberger, J. DeVetter, L.W. Dentzman, K.E. 2019 Polyethylene and biodegradable plastic mulches for strawberry production in the United States: Experiences and opinions of growers in three regions HortTechnology 29 619 628 Goldberger, J. Jones

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Emily E. Braun, Sarah Taylor Lovell, Mohammad Babadoost, Frank Forcella, Sharon Clay, Daniel Humburg, and Sam E. Wortman

essential plant nutrients ( Bond and Grundy, 2001 ). Moreover, straw and hay mulches can carry weed seeds and increase seed bank density ( Schonbeck, 1999 ). Plastic and biodegradable plastic mulch films are commonly used for weed management in vegetable