Abstract
Purpose
NH4+ and NO3− are the two main inorganic N forms available for plant growth, and NO3− is the preferred N source of maize (Zea mays L.) grown in acid soils. However, the mechanisms for this preference and its contribution to fertilizer N recovery efficiency (FNRE) remained unclear.
Materials and methods
In this 30-day pot experiment, acid soil (pH 4.54; base saturation, 27%) with or without maize plants was supplied with 15N-labeled NH4Cl (20.12 atom % excess), NaNO3 (30.15 atom % excess), or urea (20.10 atom % excess) at the rate of 200 mg N kg−1 without or with liming (1.2 g CaCO3 kg−1).
Results and discussion
Without liming, maize biomass and FNRE were higher under NO3− or urea than under NH4+. Lime increased the maize biomass and FNRE by 421–835% under NH4+ and by 30–112% under NO3− or urea. Without lime, the maize shoot Al concentration was much lower under urea or NO3− than under NH4+, because NH4+ decreased soil pH by 0.35 units and increased soil exchangeable Al concentration by 4–11%. Lime increased soil pH by 0.1–0.3 units and decreased soil exchangeable Al concentration by 25–57%. Among various treatments, the biomass of maize plants was negatively correlated with soil exchangeable Al concentration.
Conclusions
The preference of maize plants for NO3− improves the FNRE of maize in acid soil partially due to alleviated Al toxicity as a result of soil pH increase.
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Data availability
All data and materials in this study are available from the corresponding author on reasonable request.
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Acknowledgements
We thank Dr. An Yong Hu from Nantong University for comments on the manuscript, and Ms. Deling Sun and Qiaojun Fan for technical support.
Funding
This work was supported by the National Natural Science Foundation of China (Nos. 31672229 and 42077101); the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDA24020104); and the National Key Research and Development Program of China (No. 2019YFC1803704).
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XQZ conceived and designed the experiments. JLW performed all of the experiments. HQZ assisted soil preparation and maize harvest. JLW analyzed data and prepared the figures and tables. XQZ and JLW wrote the manuscript draft. RFS and HQZ revised the manuscript. All the authors approved the submitted version.
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Wang, J.L., Zhao, X.Q., Zhang, H.Q. et al. The preference of maize plants for nitrate improves fertilizer N recovery efficiency in an acid soil partially because of alleviated Al toxicity. J Soils Sediments 21, 3019–3033 (2021). https://doi.org/10.1007/s11368-021-03007-9
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DOI: https://doi.org/10.1007/s11368-021-03007-9