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