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82 P R A C T I C A L W I N E R Y & V I N E YA R D May 2015 82 P R A C T I C A L W I N E R Y & V I N E YA R D May 2015 G R A P E G R O W I N G ing 4 to 10 kg sulfur per hectare (3.6 to 8.9 pounds per acre), see Table I. The com- bined sulfur contents of vine and cover crop tissues are equivalent to 10% to 23% of the elemental sulfur applied annually. Dissolved SO 4 2- and total dissolved sulfur were measured for three years in precipitation, irrigation, soil water and leachate within the soil profile. During short (four-hour) irrigation events, SO 4 2- concentrations in leachate were low (4.5 ± 0.66 mg SO 4 2- -S per liter, but increased to 13.7 ± 2.6 mg SO 4 2- -S per liter as the soil saturated during longer (more than eight-hour) irrigation events in 2005 and 2006 (Figure 1). In every year, dormant season storms flushed accumulated SO 4 2- and organic sulfur from the soil. The elevated con- centrations were measured during storm events in all three years, with dissolved organic sulfur (total dissolved sulfur less dissolved SO 4 2- ) comprising the majority of sulfur in solution (Figure 1). During the wettest season of the study (October 2005 through May 2006), sulfur species in soil and water did not return to growing season levels until applications began the following growing season. Based on average total dissolved sulfur concentrations and water fluxes from the s c i e n c e a p l a t f o r m f o r p r o g r e s s 66th ASEV National Conference June 15 –18, 2015 Portland Marriott Downtown Hotel Portland, Oregon USA S P E C i A l E V E N t S • Merit Award Presentation — Mr. E.B. "Pete" Downs, Consulting Enologist and Retired Senior VP for External Affairs, Kendall-Jackson, California • Extension Distinction Award Presentation • 2nd International Symposium on Nitrogen in Grapes and Wine • Tour of Columbia Gorge and Wineries • Research Reports • Oregon Regional Wine Reception • Industry Seminars & Supplier Displays • Outreach Seminar — Balancing Vines and Wines from Coast to Desert • Student Flash Talks MEMBERS SAVE! Member registration fees are signifcantly lower than non-member fees. Apply online! American Society for Enology and Viticulture Visit Our Website for Updates on the 2015 Program | www.asev.org | 530-753-3142