Replicability of nitrogen recommendations from ramped calibration strips in winter wheat |
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Authors: | Email author" target="_blank">David?C?RobertsEmail author B?Wade?Brorsen Randal?K?Taylor John?B?Solie William?R?Raun |
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Institution: | (1) Department of Agribusiness & Applied Economics, North Dakota State University, NDSU Dept. 7160, P.O. Box 6050, Fargo, ND 58108-6050, USA;(2) Department of Agricultural Economics, Oklahoma State University, 414 Agricultural Hall, Stillwater, OK 74078, USA;(3) Department of Biosystems and Agricultural Engineering, Oklahoma State University, 111 Agricultural Hall, Stillwater, OK 74078, USA;(4) Department of Plant and Soil Sciences, Oklahoma State University, 044 N. Agricultural Hall, Stillwater, OK 74078, USA |
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Abstract: | Ramped calibration strips have been suggested as a way for grain producers to determine nitrogen needs more accurately. The
strips use incrementally increasing levels of nitrogen and enable producers to conduct an experiment in each field to determine
nitrogen needs. This study determines whether predictions from the program Ramp Analyzer 1.2 are replicable in Oklahoma hard
red winter wheat (Triticum aestivum). Predictions are derived from 36 individual strips from on-farm experiments—two pairs of adjacent strips at each of nine
winter wheat fields in Canadian County, OK. The two pairs of strips within each field were between 120 and 155 m apart. Each
strip was analyzed three times during the 2006–2007 growing season. Nitrogen recommendations from Ramp Analyzer 1.2 are not
correlated even for strips that were placed side by side, and recommendations from strips in the same field show no more homogeneity
than randomly selected strips throughout the county. The results indicate that ramped calibration strips are unlikely to produce
accurate nitrogen requirement predictions at any spatial scale, whether at the county level or for subsections of a single
field. In contrast, a procedure that uses only measures from the plot with no nitrogen and the plot with the highest level
of nitrogen applied does show replicability. Thus, improvements in the ramped calibration strip technology are needed if it
is to become viable. |
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