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1. Analysis of 10 Years of N Rate and Timing Work in Oklahoma Winter WheatThis study was conducted to determine optimum top-dress nitrogen fertilizer rate by location and environment so it may be reproduced in following years. Winter wheat was planted in different locations each year starting in 2009. Each location had a treatment structure consisting of Preplant nitrogen rates ranging from 28.02kg/ac to 224.17kg/ac and top-dress nitrogen rates ranging from 28.02kg/ac to 140.11kg/ac. When top-dressing occurred there was two plots that had sensor based rates that used... S.G. Akin, B. Arnall |
2. Analysis of 13 Years of Nitrogen Rate and Timing Work in Oklahoma Winter WheatIn 1999, Raun and Johnson estimated that the worlds nitrogen use efficiency (NUE) in cereal grains was 33%. After two decades of improvement (Omara et al, 2019) revised the prior world NUE for cereal grains to 35%. This improvement can be partially attributed to the change in producer practices of timing of nitrogen applications from an all pre-plant application to a split application of both pre-pant and in-season. The experiment that is analyzed within this study was established in 2009 with... S. Akin, B. Arnall |