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Begin forwarded message: >> >> >> >> >> HRT/PSMS Spring 2014 Seminar Series >> >> Dr. Timothy Griffin >> Friedman School of Nutrition Science & Policy >> Tufts University >> >> will present >> >> “Greenhouse Gas Emissions from Potato Systems” >> >> Greenhouse gas (GHG) emissions from agricultural systems are affected by many production practices, and there are few estimates from high-value crops like potato. Estimates of carbon dioxide (CO2 ) and nitrous oxide (N2 O) flux were conducted over three growing seasons on a sandy loam soil in Presque Isle, ME. Three production systems were included: 1) Business as Usual, 2) Soil Conserving, and 3) Soil Improving. The Business as Usual system consists of a barley-potato rotation with fall tillage for both crops. The Soil Conserving scenario employed no-till planting barley plus interseeded timothy in Year 1, followed by timothy sod in Year 2, and spring tillage with potato in Year 3. The Soil Improving system had the same crop and tillage sequence, plus annual input of compost. Samples were collected from vented chambers (0.4 by 0.8 m) at 7-14 d intervals. Cumulative CO2 flux was slightly greater in the potato phase than in barley, likely due to frequent disturbance events. Emission of N2 O from potato under saturated conditions was 5 to 10-fold higher than from barley, due to both placement and amount of N fertilizer input, and was mitigated by C accumulation in the Soil Improving system. Cumulative global warming potential (GWP) of emissions from barley were dominated by CO2 , while flux from potato was predominantly N2 O. >> >> >> Thursday, March 20 @ 4:10 pm >> A149 Plant & Soil Science Bldg >> >> Refreshments will be served @ 4:00 pm >> >> Sherry M. Mulvaney >> Office Assistant >> Michigan State University >> Department of Horticulture >> 1066 Bogue St, Room A288 >> Plant & Soil Sciences Bldg. >> East Lansing, MI 48824-1325 >> Office: 517-355-5191 ext. 1362 >> Fax: 517-355-0249 > Therese Iadipaolo > Secretary Main Office > Department of Plant, Soil and Microbial Sciences > Plant and Soil Sciences Building > 1066 Bogue St. Rm A286 > Michigan State University > East Lansing, MI 48824 > Ph:(517) 355-0271 x1-120 > Fx: (517) 353-5174 > email: [log in to unmask] > "Work is not what you do for a living but what you do with your living" ~ William J. Bennett >