Article ID Journal Published Year Pages File Type
6773071 Soil and Tillage Research 2018 10 Pages PDF
Abstract
Despite the perceived importance of nitrogen (N) to growth and production of wheat, few studies have attempted to examine the effect of warming on wheat N uptake or its preference for NO3−-N vs. NH4+-N, especially under different tillage systems. In the North China Plain, an experimental warming (2 °C increase in soil during the jointing stage) study was conducted using in situ 15N labeling under till and no-till systems. We aimed to investigate the uptake of NO3−-N, NH4+-N, and glycine-N by winter wheat. Warming strongly enhanced wheat biomass (14.7% and 13.2% for till and no-till, respectively) and N content in biomass (11.1 and 7.4 g N m−2 for till and no-till, respectively). Total N uptake rates increased by 47% and 40% under till and no-till treatments, respectively. Warming changed the uptake pattern for the three N forms by significantly increasing the contributions of NO3--N by 16% and glycine-derived N by 5%, while decreasing the contribution of NH4+-N by 20% under the two tillage systems, on average. Collectively, high soil temperatures accelerated N uptake in winter wheat and improved the preferential contribution of NO3−-N and glycine-N due to the increase in soil glycine and NO3− content. Our findings suggest that enhanced N uptake improved growth of wheat and could reduce N losses through increased uptake of NO3− under till and no-till systems in the North China Plain under the warmer conditions that are likely in future.
Related Topics
Physical Sciences and Engineering Energy Renewable Energy, Sustainability and the Environment
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