Nitrapyrin Mitigates Nitrous Oxide Emissions, and Improves Maize Yield and Nitrogen Efficiency under Waterlogged Field

Abstract

In order to explore the effects of nitrapyrin (N-Serve) application on greenhouse gas emission and nitrogen (N) leaching of a waterlogged maize (Zea mays L.) field, we investigated the effects of applying nitrapyrin on soil ammonium (NH4+-N) and nitrate nitrogen (NO3−-N) content, nitrous oxide (N2O) fluxes, and the warming potential (GWPN2O) in a waterlogged maize field. The design included three treatments: waterlogging treatment with only urea application (V-3WL), waterlogging treatment with urea and nitrapyrin application (V-3WL+N), and no waterlogging treatment applying only urea (CK). Our results revealed that waterlogging led to the increase of nitrate concentrations across the soil profile, thus potentially increasing N leaching and decreasing N use efficiency. The accumulated N2O emissions increased significantly in waterlogged plots compared to control plots, and maximum N2O emission fluxes occurred during the process of soil drying after waterlogging; this resulted in an increase in GWPN2O and N2O greenhouse gas intensity (GHGIN2O) by 299% and 504%, respectively, compared to those of CK. However, nitrapyrin application was able to reduce N2O emissions. Nitrapyrin application was also good for decreasing GWPN2O and GHGIN2O by 34% and 50%, respectively, compared to V-3WL. In addition, nitrapyrin application was conducive to reduce N leaching and improve N use efficiency, resulting in a yield increase by 34%, compared to that of V-3WL. The application of nitrapyrin helped to mitigate agriculture-source greenhouse effects and N leaching induced by waterlogging, and was a high N-efficient fertilizer method for a waterlogged field.

Genetic resources and precise gene editing for targeted improvement of barley abiotic stress tolerance

“…However, modelling predicts more frequent and severe waterlogging stress for countries such as Argentina, Ethiopia, China, the UK, France, and Germany, some of which are the world's largest barley producers (Liu et al, 2023). Furthermore, waterlogged soils release larger amounts of the greenhouse gas nitrous oxide into the atmosphere, contributing to global warming potential, and compounding the issues of climate change (An et al, 2022;Ren BZ et al, 2022).…”