caa a22 4500 44586463X CHVBK 20180317145454.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1007/s11119-010-9196-z doi (NATIONALLICENCE)springer-10.1007/s11119-010-9196-z Independence of yield potential and crop nitrogen response [Elektronische Daten] [William Raun, John Solie, Marvin Stone] Crop yield level and nitrogen (N) responsiveness influence the demand for fertilizer. If they were found to be unrelated, this would justify using a combination of both for determining fertilizer N requirements. Failure to understand the independence of crop response to N and yield level has led to confusion as to what theory is appropriate for making N fertilizer rate recommendations. The sufficiency approach applies a fixed rate of N at a computed sufficiency level, regardless of yield potential. Alternatively, mid-season optical sensor estimates of yield potential and crop response to additional N provide a physiological basis to estimate N removal and a biologically based N application rate. This study investigated the relationship between grain yield and response to N in long-term wheat and corn experiments. No relationship between response to N and grain yield was found. There was also no relationship between yield and year at two of three sites. Finally, there was no relationship between response to N and year at any site. Because yield and response to N were consistently independent of one another, and as both affect the demand for fertilizer N, estimates of both should be combined to calculate realistic in-season N rates. Springer Science+Business Media, LLC, 2010 Nitrogen nationallicence Yield potential nationallicence Sufficiency nationallicence Recommendations nationallicence Sensor-based nationallicence Nitrogen response nationallicence Nitrogen recommendations nationallicence Nitrogen fertilizer rates nationallicence Raun William Department of Plant and Soil Sciences, Oklahoma State University, 044N. Ag Hall, 74078, Stillwater, OK, USA aut Solie John Department of Biosystems and Agricultural Engineering, Oklahoma State University, 044N. Ag Hall, 74078, Stillwater, OK, USA aut Stone Marvin Department of Biosystems and Agricultural Engineering, Oklahoma State University, 044N. Ag Hall, 74078, Stillwater, OK, USA aut Precision Agriculture Springer US; http://www.springer-ny.com 12/4(2011-08-01), 508-518 1385-2256 12:4<508 2011 12 11119 https://doi.org/10.1007/s11119-010-9196-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11119-010-9196-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Raun William Department of Plant and Soil Sciences, Oklahoma State University, 044N. Ag Hall, 74078, Stillwater, OK, USA aut NATIONALLICENCE 700 1- Solie John Department of Biosystems and Agricultural Engineering, Oklahoma State University, 044N. Ag Hall, 74078, Stillwater, OK, USA aut NATIONALLICENCE 700 1- Stone Marvin Department of Biosystems and Agricultural Engineering, Oklahoma State University, 044N. Ag Hall, 74078, Stillwater, OK, USA aut NATIONALLICENCE 773 0- Precision Agriculture Springer US; http://www.springer-ny.com 12/4(2011-08-01), 508-518 1385-2256 12:4<508 2011 12 11119 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer