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John M. Luna and Mary L. Staben

Sustainable Agriculture Research and Education Program, and the Oregon State Univ. Agricultural Research Foundation. We also thank Dick Strunk and the Northwest Farm Tillers, Yakima, Wash., for providing strip tillage equipment.

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Maren J. Mochizuki, Anusuya Rangarajan, Robin R. Bellinder, Thomas Björkman and Harold M. van Es

particularly susceptible to a decline in soil quality because field operations are often required when the soil is wet, both early in the spring and the late fall ( Reiners, 2004 ). Conservation tillage, any practice that minimizes soil and water loss and

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Dana Jokela and Ajay Nair

Researchers have increasingly been investigating cover crop–based reduced tillage systems, such as NT and ST, as methods for mitigating some of the adverse effects of CT. In these systems, cover crops are grown before cash crop establishment and are

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Lewis W. Jett and Timothy P. Talbot

A cultural practice that can modify and conserve the soil environment is needed in sweetpotato [Ipomoea batatas (L.) Lam.] production. The objective of this research was to evaluate conventional and conservation tillage of sweetpotato with four cover crop species (fallow, ryegrass, rye, and wheat). The cover crops were seeded in late Oct. 1995, and the sweetpotato transplants (`Beauregard') were transplanted at two dates the following spring (May and June). Conservation tillage significantly lowered soil temperature (10 cm depth) during storage root initiation and development. Moreover, each cover crop significantly reduced weed emergence and soil erosion. The ryegrass conservation tillage treatment significantly increased marketable yield of sweetpotato in the first planting date, while rye and wheat performed equally well in the second planting date. In the second planting date, white grub (Phyllophaga ephilida Say) injury to storage roots was significantly higher in the conservation tillage treatments. However, conservation tillage seems to be a viable alternative to the conventional method of sweetpotato production.

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Jeffrey P. Mitchell, Karen M. Klonsky, Eugene M. Miyao, Brenna J. Aegerter, Anil Shrestha, Daniel S. Munk, Kurt Hembree, Nicholaus M. Madden and Thomas A. Turini

evolved in California’s Central Valley also rely heavily on tillage for seedbed preparation, weed control, and postharvest residue incorporation ( Miyao et al., 2008 ; Stoddard et al., 2007 ). Intensive tillage and cultivation practices that are used

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Gina M. Angelella and Megan E. O’Rourke

grazing ( Aldrich, 2002 ). Comparisons of tillage and herbicide seedbed preparations have generated mixed results. One study demonstrated that tillage yielded better wildflower establishment than herbicides after two years ( Ahern et al., 1992 ), whereas

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Jason M. Lilley and Elsa S. Sánchez

and Godfrey, 2011 ). Research on the feasibility of adopting new ecologically based strategies, such as conservation tillage and the use of rowcovers, will aid growers in keeping up with rising consumer demand for local produce while maintaining or

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Guangyao Wang and Mathieu Ngouajio

dispersal ( Hausbeck and Lamour, 2004 ; Ristaino and Johnston, 1999 ). Cover cropping, combined with conservation tillage, can leave enough residue on the soil surface to minimize contact of the soil by fruit. Ristaino et al. (1997) showed that no

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Rachel E. Rudolph, Lisa W. DeVetter, Chris Benedict and Inga A. Zasada

during the fall. Others may wait until spring to fumigate. In both cases, the soil is tilled in the spring, beds are shaped, red raspberry is planted, and new posts and trellising wire are put in place. Soil tillage and fumigation are two management

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Erin R. Haramoto and Daniel C. Brainard

planted into this strip. Soil between rows (BR) is left undisturbed, which may reduce the potential for erosion and maintain soil quality—advantages that ST provides compared with CT. Strip tillage also offers advantages compared with no-till—it offers a