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Samuel Y.C. Essah, Jorge A. Delgado, Merlin Dillon and Richard Sparks

There have been reports of cover crops increasing the yield of the following crops ( Clark, 2007 ; Dabney et al., 2010 ; Delgado et al., 2007 ). However, there is a need for additional research on the potential benefits that cover crops may have

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John E. Beck, Michelle S. Schroeder-Moreno, Gina E. Fernandez, Julie M. Grossman and Nancy G. Creamer

subsequent yield benefits to strawberry plants. Garland et al. (2011) suggested summer cover crop growth in NC strawberry production may be enhanced through increased seeding rate and compost additions when cover crops are planted; yet, research is lacking

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Ted S. Kornecki and Francisco J. Arriaga

protect soil resources while increasing or maintaining yields. Cover crop use can improve soil physical properties, increase soil organic carbon, conserve soil water, reduce surface runoff, and recycle nutrients ( Hubbell and Sartain, 1980 ; Mansoer et al

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John E. Montoya Jr., Michael A. Arnold, Juliana Rangel, Larry R. Stein and Marco A. Palma

result in larger and more diverse populations of pollinators around those crops. Even though the addition of companion plantings to crops has been known to increase insect diversity, further research is needed to determine if crop yield can also be

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Raymond Kruse and Ajay Nair

tillage and herbicides and offer additional benefits to the soil and environment while also increasing or maintaining vegetable yield ( Kumar et al., 2009 ). Studies have reported successful weed suppression using cover crops ( Bugg and Dutcher, 1989

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Guangyao Wang, Mathieu Ngouajio, Milton E. McGiffen Jr and Chad M. Hutchinson

pest populations and reduce soil erosion, nutrient leaching, and contamination of surface and groundwater ( Hartwig and Ammon, 2002 ; Hutchinson and McGiffen, 2000 ). However, cover crops could also reduce the subsequent crop yield ( Al-Khatib et al

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E. Ryan Harrelson, Greg D. Hoyt, John L. Havlin and David W. Monks

evaporation under conservation tillage generally increases plant-available water and subsequent crop yield potential ( Griffith et al., 1986 ). This increased available water is particularly important in dry land cropping systems in arid and semiarid regions

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André Pereira and Nilson Villa Nova

the yield attainable under existing farm conditions that takes into account all the factors limiting the production process and the crop yield. Meteorological factors directly influence potential crop productivity, regulating its transpiration

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Ray R. Hollist, Ronald H. Campbell and Robert Campbell

Over the past few years, grain yield monitors have gained a significant hold in the market place. While the largest share of production agriculture acres are devoted to producing grain crops, high-value crops such as potatoes, tomatoes, sugarbeets, onions, and many others will benefit considerably by application of site-specific technology. Yield mapping is one of the tools that utilizes GPS technology and allows us to visualize our farms as an array of tiny parcels instead of one uniform aggregate. Yield mapping is simple, accurate measurement of yield at precise positions, the data from which is used to give us a visual report card of each parcel in that field. While yield mapping will not provide the entire basis of site-specific agriculture management, it begins to give a picture of how understanding spatial variation will revolutionize management of high-value crop production acres. The tools necessary to make yield measurements are now available. When combined with Differential GPS, the yield map becomes a powerful tool to identify atypical areas in the field. Without DGPS the process of identifying and treating areas within a field individually would be a nearly impossible task, and certainly cost-prohibitive. Identification of the spatial distribution of yield will contribute significantly to a grower's ability to make informed management decisions.

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Guangyao Wang, Mathieu Ngouajio and Darryl D. Warncke

could reduce fertilizer input and nutrient leaching while maintaining desirable crop yield. In Michigan, onions are usually seeded in April and harvested in September. The long growing season does not provide an adequate window to grow warm-season cover