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Exploring Temperature-Related Effects in Catch Crop Net N Mineralization Outside of First-Order Kinetics

Department of Agroecology, Section for Soil Fertility, Aarhus University Foulum, 8830 Tjele, Denmark
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Academic Editor: Germán Tortosa
Received: 12 March 2021 / Revised: 23 March 2021 / Accepted: 24 March 2021 / Published: 1 April 2021
Catch crops are an effective method for reducing nitrogen (N) leaching in agriculture, but the mineralization of incorporated catch crop residue N is difficult to predict and model. We conducted a five-month incubation experiment using fresh residue from three catch crops (hairy vetch, fodder radish and ryegrass) with three temperature treatments (2 °C, 15 °C and 2–15 °C variable temperature) and two termination methods (glyphosate and untreated). Mineral N (ammonium and nitrate) in soil was quantified at 0, 1, 2, 4, 8 and 20 weeks of incubation. Ammonium accumulation from residue decomposition showed a lag at low and variable temperature, but subsequent nitrification of the ammonium did not. Mineral N accumulation over time changed from exponential to sigmoidal mode at low and variable temperature. Incubation temperature significantly affected mineralization rates in a first-order kinetics (FOK) model, while plant type and termination method did not. Plant type alone had a significant effect on the final mineralized fraction of added catch crop N. FOK models modified to accommodate an initial lag were fitted to the incubation results and produced better goodness-of-fit statistics than simple FOK. We suggest that initial lags in residue decomposition should be investigated for the benefit of mineralization predictions in cropping models. View Full-Text
Keywords: nitrogen mineralization; catch crops; incubation; soil organic matter; glyphosate; soil microbes; first-order kinetics; modeling nitrogen mineralization; catch crops; incubation; soil organic matter; glyphosate; soil microbes; first-order kinetics; modeling
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MDPI and ACS Style

Miranda-Vélez, J.F.; Vogeler, I. Exploring Temperature-Related Effects in Catch Crop Net N Mineralization Outside of First-Order Kinetics. Nitrogen 2021, 2, 110-127. https://0-doi-org.brum.beds.ac.uk/10.3390/nitrogen2020008

AMA Style

Miranda-Vélez JF, Vogeler I. Exploring Temperature-Related Effects in Catch Crop Net N Mineralization Outside of First-Order Kinetics. Nitrogen. 2021; 2(2):110-127. https://0-doi-org.brum.beds.ac.uk/10.3390/nitrogen2020008

Chicago/Turabian Style

Miranda-Vélez, Jorge F., and Iris Vogeler. 2021. "Exploring Temperature-Related Effects in Catch Crop Net N Mineralization Outside of First-Order Kinetics" Nitrogen 2, no. 2: 110-127. https://0-doi-org.brum.beds.ac.uk/10.3390/nitrogen2020008

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