235-6 Effects of Long-Term Nitrogen Management on Nitrogen Budgets of Irrigated No-till Corn.

See more from this Division: SSSA Division: Nutrient Management and Soil and Plant Analysis
See more from this Session: The Impact of 4Rs (Source, Rate, Time and Place) on Crop Yield Oral

Tuesday, November 8, 2016: 11:10 AM
Phoenix Convention Center North, Room 132 A

Jorge A. Delgado1, Ardell D. Halvorson2, Catherine Stewart3, Stephen J. Del Grosso4, Daniel K. Manter5, Robert D'Adamo6 and Bradley Floyd1, (1)USDA-ARS, Fort Collins, CO
(2)USDA-ARS, Ft. Collins, CO
(3)Soil-Plant-Nutrient Research, USDA-ARS, Fort Collins, CO
(4)Agricultural Research Service, United States Department of Agriculture, Fort Collins, CO
(5)Bldg D, Suite 100, USDA-ARS, Fort Collins, CO
(6)USDA, Fort Collins, CO
Abstract:
Effects of nitrogen management on irrigated no-till (NT) corn (Zea Mays L) yields were studied from the 1999 to 2015 growing seasons in a Fort Collins clay loam soil at the CSU ARDEC near Fort Collins, CO.  The NT N fertilizer rates averaged 0, 34, 67, 134, 202 and 246 kg N ha-1. Fifteen corn plants were collected at 146 days after planting (DAP) to determine corn grain, cob, stalk and total aboveground biomass. Harvest grain yields were determined by harvesting 15 m of row at 173 DAP. We measured N uptake in the aboveground plant compartments and in the 0 – 1.5 m soil profile. Nitrogen fertilizer inputs increased soil organic N (P<.001) and reduced N use efficiencies (P<.001). A nitrogen budget will be presented for this corn-corn rotation and assessment of the losses of N and pathways for these losses will be presented.

See more from this Division: SSSA Division: Nutrient Management and Soil and Plant Analysis
See more from this Session: The Impact of 4Rs (Source, Rate, Time and Place) on Crop Yield Oral