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44th TWC, Tob. Work. Conf., 2010, abstr. 05

Results of a survey of well water used in tobacco greenhouses in Georgia

MOORE J.M.
University of Georgia, Cooperative Extension Sce, Tifton, GA, USA

High alkalinity resulting from excessive carbonates, bicarbonates and hydroxides in the well water used for float production of tobacco transplants have been determined to reduce the growth of seedlings in NC, SC, and VA. In these areas acidification of the water is routine and required. No survey of the tobacco producing area of Georgia had been conducted to determine the variation of alkalinity across the area. Recommendations had been based on individual well water samples. Prior to the 2009 seedling production season Extension Agents were offered an opportunity to submit well water samples from tobacco greenhouse transplant producers. A pre-prepared laboratory form was provided (billing, sample analysis variables, reporting). A standard sampling protocol was followed. Water lines were flushed before collecting water at the well. Samples were collected and the cap replaced on the bottle. A completed sample identification sheet was enclosed. Samples were shipped immediately to the UGA Soil, Plant and Water Laboratory for analysis. Results of analyses were reported to County Agents and after conferring with the Extension Tobacco Specialist growers were informed. Sample analyses were conducted to determine: pH, alkalinity (ppm), conductivity (µS/cm). Forty six samples were submitted from 12 Georgia counties where tobacco is grown. Twenty eight samples were determined to have moderate alkalinity. The pH of all samples ranged from 4.81 to 7.94. Alkalinity ranged from 5 to 175 ppm. Conductivity ranged from 14.5 to 657 µS/cm. Results indicate a moderate level of alkalinity in Georgia water and little need to acidify the water as it is used. Acidic fertilizers (20-10-20, 20-20-20) should adequately offset the existing alkalinity in water used in tobacco seedling production greenhouses..