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Evaluation of Nitrogen and Phosphorus Fertilizer Placement with Strip Tillage for Irrigated Pacific Northwest Corn Production

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Nutrient placement options with strip tillage (ST) can potentially improve plant nutrient utilization and increase crop yield compared to conventional fertilizer placement practices under conventional tillage (CT). The effects of tillage practice and N and P placement on grain yield, biomass yield (whole plant, grain + cobs + stover), and N and P uptake of field corn (Zea mays L.) were assessed on four sites during 2007 and 2009 at the USDA-ARS Northwest Irrigation & Soils Research Laboratory at Kimberly, ID. During each year, two locations (eroded and not eroded from furrow irrigation) were utilized as study locations. Band placement (15 to 20 cm below the soil surface) of fertilizer with ST increased corn grain yield by 12.5 (689 kg/ha) and 25.9% (1,626 kg/ha) on the eroded locations compared to broadcast N and P and 5 × 5-cm N under CT in 2007 and 2009, respectively. These increased yields also resulted in greater removal of N and P. Reduced tillage costs of ST with associated band placement of N and P could increase the economic productivity of many acres of land in the Pacific Northwest.
Tarkalson, David , Bjorneberg, Dave
Includes references
Crop management 2010
Journal Articles, USDA Authors, Peer-Reviewed
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