Abstract
Purpose
Excess anion uptake in the form of nitrate has been shown to reduce soil acidification. The question is to what extent the deep placement of calcium nitrate can increase this root-induced alkalization in reducing subsurface soil acidity.
Methods
Wheat and canola were grown for 35 days in reconstructed soil columns comprising of topsoil (pHCaCl2 5.4) in 0–10 cm and subsurface soil (pHCaCl2 4.8) in 10–50 cm. Two forms of 15N-enriched fertilizers (urea versus calcium nitrate at 237 mg N per column) with or without P fertilizer (NaH2PO4 at 99 mg P per column) were placed at 0–10, 10–20, or 20–30 cm depth. Root proliferation, rhizosphere pH, and shoot 15N recovery were quantified.
Results
Uptake of Ca(NO3)2 increased pH up to 0.5 and 0.2 units in the rhizosphere and bulk soil, respectively, in all treated layers compared to those with urea. The combined application of nitrate and P fertilizer facilitated plant nitrate uptake and hence rhizosphere alkalization. Significant increases up to 10% and 22% in shoot and root biomass, respectively, were observed in the combination of nitrate and P treatments compared with the combined urea and P treatments. The nitrate treatment significantly increased the 15N recovery of fertilizer in both wheat and canola up to 20% compared with the urea treatment.
Conclusions
The increased nitrate uptake reduced subsurface acidity. The combination of nitrate and P treatment can facilitate alkalinity movement downward, hence ameliorating subsurface soil acidity.
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Acknowledgements
This work was part of the project “Innovative approaches to managing subsoil acidity in the southern grain region” (DAN00206) supported by Grains Research and Development Corporation of Australia. We thank Drs Jason Condon and Sergio Moroni for allowing access to the Rutherglen experimental site for soil collection, and Yunfang Qiao and Shujie Miao, Dominic Lauricella and Janani Jasinghe Basthian Arachchige for root harvest. We acknowledge the technical support by Melbourne University TrACEES Platform (Trace Analysis for Chemical, Earth and Environmental Sciences) for the IRMS analyses.
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Weng, Z.(., Butterly, C.R., Sale, P. et al. Combined nitrate and phosphorus application promotes rhizosphere alkalization and nitrogen uptake by wheat but not canola in acid subsoils. J Soils Sediments 21, 2995–3006 (2021). https://doi.org/10.1007/s11368-021-03000-2
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DOI: https://doi.org/10.1007/s11368-021-03000-2