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Comments on “Variability in Corn Response to Nitrogen Fertilizer in Eastern Canada” by L.A. Kablan, V. Chabot, A. Mailloux, M.E. Bouchard, D, Fontaine, and T. Bruulsema, Agron. J. 109:2231–2242 (2017)
Author(s) -
Parent LéonÉtienne,
Tremblay Gilles,
Robert Louis,
Faucher Yvan,
Kablan Lucie A,
Chabot Valérie,
Mailloux Alexandre,
Bruulsema Tom
Publication year - 2018
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj2018.03.0200
Subject(s) - confounding , agronomy , zea mays , mathematics , fertilizer , statistics , nitrogen , environmental science , econometrics , biology , physics , quantum mechanics
Core Ideas The experimental design was inappropriate in relation to the objectives. Eleven factors were confounded. Contrasting previous crops, methods of N application and N sources were assumed to be equivalent. Results of two‐way ANOVAs were not reported to support models and mean comparisons. Interpretation should consider non‐responsive trials and confounding factors. Incomplete statistical and economic analyses led to higher economic N rate.