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Blue Ridge, Cape Fear, Georgiagem, and O Neal southern highbush blueberry cultivars were grown for 5 years on a fine sandy loam soil in a comparison of plants either mulched with uncomposted pine sawdust and woodchips or nonmulched. Other cultural practices were identical and all plants received the same amount of trickle irrigation. A significant mulch × cultivar interaction for yield and mulch × plant age interactions for yield, individual berry weight, and plant volume were found. Cape Fear was the highest-yielding mulched cultivar, followed by Blueridge, Georgiagem, and O Neal. Mulched plants had higher yields and produced larger plants. Average individual berry weight was greater for mulched plants in the first year of harvest, but not different among treatments in other years. The data reveal that these southern highbush cultivars performed similar to northern highbush (Vaccinicum corymbosum L.) in their need for mulching for adequate production on upland soils.

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). The nitrification inhibitors dicyandiamide and 3-amino-1,2,4-triazole reduced nitrification by 28% and 52% in subtropical and upland soil conditions ( Singh and Verma, 2007 ). Urease inhibitors slow the urease enzyme that changes urea into ammonia

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upland soil series was located on Ruston, Norfolk, Tifton, Orangeburg, Greenville, Red Bay, and Cecil soils. About 66% and 60% of the soils surveyed in 2005 and 2008, respectively, were among these soil groups ( Tables 1 and 2 ). Soil pH averaged 5

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