Understanding the variables that affect the anaerobic potentially mineralizable N (PMNan) test should lead to a standard procedure of sample collection and incubation length, improving PMNan as a tool in corn (Zea mays L.) N management. We evaluated the effect of soil sample timing (preplant and V5 corn development stage [V5]), N fertilization (0 and 180 kg ha−1) and incubation length (7, 14, and 28 d) on PMNan (0–30 cm) across a range of soil properties and weather conditions. Soil sample timing, N fertilization, and incubation length affected PMNan differently based on soil and weather conditions. Preplant vs. V5 PMNan tended to be greater at sites that received < 183 mm of precipitation or < 359 growing degree-days (GDD) between preplant and V5, or had soil C/N ratios > 9.7:1; otherwise, V5 PMNan tended to be greater than preplant PMNan. The PMNan tended to be greater in unfertilized vs. fertilized soil in sites with clay content > 9.5%, total C < 24.2 g kg−1, soil organic
Soil Science Society of America Journal
DOI of Published Version
© 2020 The Authors. Soil Science Society of America published by Wiley Periodicals, Inc. on behalf of Soil Science Society of America
Clark, Jason; Veum, Kristen S.; Fernandez, Fabian G.; Kitchen, Newell R.; Camberato, James J.; Carter, Paul R.; Ferguson, Richard B.; Franzen, David W.; Kaiser, Daniel E.; Laboski, Carrie A.M.; Nafziger, Emerson D.; Rosen, Carl J.; Sawyer, John E.; and Shanahan, John F., "Soil Sample Timing, Nitrogen Fertilization, and Incubation Length Influence Anaerobic Potentially Mineralizable Nitrogen" (2020). Agronomy, Horticulture and Plant Science Faculty Publications. 367.
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