Phosphorus availability and speciation in the fertosphere of three soils over 12 months

McKenna, Brigid A.; Kopittke, Peter M.; Bell, Michael J.; Lombi, Enzo; Klysubun, Wantana; McLaren, Timothy I.; Doolette, Casey L.; Meyer, Gregor

doi:10.1016/j.geoderma.2024.116913

Geoderma

2024

DOI: 10.1016/j.geoderma.2024.116913

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Phosphorus availability and speciation in the fertosphere of three soils over 12 months

Brigid A. McKenna,

Peter M. Kopittke,

Michael J. Bell

et al.

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2024

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The spatial distribution of soil nitrogen determines responses of Sorghum bicolor to banded phosphorus fertiliser

Hunter,

Bell,

van der Bom

et al. 2024

Crop & Pasture Science

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Context The grain-growing areas of north-eastern Australia are a major producer of grain for human and livestock consumption, but declining soil nitrogen (N) and phosphorus (P) fertility is increasing fertiliser requirements to sustain productivity. Adding a concentrated zone of fertiliser P to the subsoil (i.e. a ‘deep P’ band) is an effective strategy to increase plant P uptake in farming systems reliant on stored soil water. However, crop responses to deep P with contrasting soil N status remain unclear. Aim This study aimed to assess responses of sorghum (Sorghum bicolor) to fertiliser P with contrasting distributions of soil N. Method A lysimeter experiment was conducted in semi-controlled environment, where sorghum was grown to physiological maturity in P depleted Vertosol with contrasting fertiliser N and P additions. Key findings Responses of sorghum to deep P were optimised when bands were placed in N enriched soil in the 0–20 cm layer, producing comparable biomass to when P was dispersed throughout the soil volume. Localised root proliferation around the deep P band was maximised when bands were placed into N-enriched soil, however plant P uptake was only 77% of that with dispersed P. Conclusions Sorghum responses to deep P were affected by the distribution of soil N within the top 60 cm of the soil profile, with maximum dry matter production, N and P uptake occurring when high concentrations of N and P were co-located in the 0–20 cm layer. Implications Adequate N status of the upper soil profile is required to optimise sorghum responses to deep P.

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The spatial distribution of soil nitrogen determines responses of Sorghum bicolor to banded phosphorus fertiliser

Hunter,

Bell,

van der Bom

et al. 2024

Crop & Pasture Science

View full text Add to dashboard Cite

show abstract

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Phosphorus availability and speciation in the fertosphere of three soils over 12 months

Cited by 1 publication

References 48 publications

The spatial distribution of soil nitrogen determines responses of Sorghum bicolor to banded phosphorus fertiliser

The spatial distribution of soil nitrogen determines responses of Sorghum bicolor to banded phosphorus fertiliser

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