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Greenhouse Gas Fluxes from an Irrigated Sweet Corn (Zea mays L.)–Potato (Solanum tuberosum L.) Rotation

^a USDA-ARS, Vegetable and Forage Research Unit, 24106 N. Bunn Rd., Prosser, WA 99350
^b Washington State Univ., Irrigated Agricultural Research and Extension Center, 24106 N. Bunn Rd., Prosser, WA 99350
^c Washington State Univ., Dep. of Crop and Soil Sciences, Pullman, WA 99164-6420

View larger version (43K): [in this window] [in a new window]   Fig. 1. Site map of the USDA-ARS Integrated Cropping Systems Research Field Station located near Paterson, Benton County, Washington (45°56'N, 119°29'W).

View larger version (27K): [in this window] [in a new window]   Fig. 2. Growing season daily maximum and minimum soil temperature (–4 cm), precipitation, and irrigation for the 2005 and 2006 crop seasons. Soil temperature was measured every 30 min using thermocouples. Arrows identify fertigation events and sampling of trace gas fluxes.

View larger version (52K): [in this window] [in a new window]   Fig. 3. Tillage trial experimental design. Trace gas sample collection occurred in second-year sweet corn and potato, fertilizer B treatment, under conventional and reduced tillage.

View larger version (21K): [in this window] [in a new window]   Fig. 4. Seasonal CO2, N2O, and CH4 flux rates from the native site during 2005 and 2006. Error bars indicate significance at p = 0.05.

View larger version (33K): [in this window] [in a new window]   Fig. 5. CO2–C, N2O–N, and CH4–C flux rates during the 2006 growing season for potato and corn under reduced (RT) and conventional (CT) tillage. Arrows identify dates of fertilization. Data are plotted as the average of the row and inter-row sample locations.

View larger version (42K): [in this window] [in a new window]   Fig. 6. Figure 3. CO2–C, N2O–N, and CH4–C flux rates during the 2005 growing season for the potato and corn under reduced (RT) and conventional (CT) tillage. Arrows identify dates of fertilization. Data are plotted as the average of the row and inter-row sample locations. Error bars indicate significance at p = 0.05.

View larger version (13K): [in this window] [in a new window]   Fig. 7. Estimated global warming potential contributions from native shrub-steppe, sweet corn, and potato fields during the 2005 and 2006 cropping seasons.