ABSTRACT The effect of long‐term climate warming on nitrogen (N) uptake and utilisation in wheat ( Triticum aestivum L.) systems is not well understood. We conducted research on it using an in situ nighttime warming (NW) experiment at heading and maturity stages of 2022–2024 and early 2015–2016 wheat growth seasons. NW significantly reduced wheat yield by 31.4% in the 2015–2016 season and remained unchanged in the 2022–2023 and 2023–2024 seasons. It significantly increased the 3‐year total biomass of wheat at heading and maturity stages (excluding the maturity stage of the 2022–2023 season) by 11.4%–29.1%. NW significantly increased N accumulation in grains and plants at heading and maturity stages in the 2015–2016 and 2023–2024 seasons. NW significantly increased N translocation before wheat flowering (except for the 2022–2023 season). However, it significantly increased N translocation from stems by 42.2%–547.4% and its contribution to N accumulation in grains (CNAG), but decreased those from leaves by 10.0%–22.6% and its CNAG for 3 seasons. NW also significantly increased N accumulation after wheat flowering and its CNAG for 3 seasons. NW increased N uptake efficiency of winter wheat by 7.8%–36.9% and decreased N use efficiency by 6.1%–49.9%, with no significant difference observed in the 2022–2023 season. This study indicates that although the effect of NW on N uptake and utilisation in wheat varied among different seasons, the impact of NW on N dynamics should be considered to recommend reasonable application of N fertiliser under climate warming scenarios to ensure sustainable wheat production and minimise potential environmental pollution.
Zhu et al. (Fri,) studied this question.
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