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Soil sample timing, nitrogen fertilization, and incubation length influence anaerobic potentially mineralizable nitrogen.

Authors :
Clark, Jason D.
Veum, Kristen S.
Fernández, Fabián 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.
Shanahan, John F.
Source :
Soil Science Society of America Journal; Mar/Apr2020, Vol. 84 Issue 2, p627-637, 11p
Publication Year :
2020

Abstract

Understanding the variables that affect the anaerobic potentially mineralizable N (PMN<subscript>an</subscript>) test should lead to a standard procedure of sample collection and incubation length, improving PMN<subscript>an</subscript> 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<superscript>−1</superscript>) and incubation length (7, 14, and 28 d) on PMN<subscript>an</subscript> (0–30 cm) across a range of soil properties and weather conditions. Soil sample timing, N fertilization, and incubation length affected PMN<subscript>an</subscript> differently based on soil and weather conditions. Preplant vs. V5 PMN<subscript>an</subscript> 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 PMN<subscript>an</subscript> tended to be greater than preplant PMN<subscript>an</subscript>. The PMN<subscript>an</subscript> tended to be greater in unfertilized vs. fertilized soil in sites with clay content > 9.5%, total C < 24.2 g kg<superscript>−1</superscript>, soil organic matter (SOM) < 3.9 g kg<superscript>−1</superscript>, or C to N ratios < 11.0:1; otherwise, PMN<subscript>an</subscript> tended to be greater in fertilized vs. unfertilized soil. Longer incubation lengths increased PMN<subscript>an</subscript> at all sites regardless of sampling methods. Since PMN<subscript>an</subscript> is sensitive to many factors (sample timing, N fertilization, incubation length, soil properties, and weather conditions), it is important to follow a consistent protocol to compare PMN<subscript>an</subscript> among sites and potentially use PMN<subscript>an</subscript> to improve corn N management. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
03615995
Volume :
84
Issue :
2
Database :
Complementary Index
Journal :
Soil Science Society of America Journal
Publication Type :
Academic Journal
Accession number :
161730350
Full Text :
https://doi.org/10.1002/saj2.20050