Lowering the water solubility of phosphorus fertilisers impacts leaching, plant growth and residual soil phosphorus

Authors

Robert N. Summers, Department of Primary Industries and Regional Development Western AustraliaFollow
David Weaver, Department of Primary Industries and Regional Development Western AustraliaFollow

Document Type

Article

Publication Date

8-1-2022

Journal Title

Soil Research

ISSN

Print: 1838-675X Electronic: 1838-6768

Keywords

citrate soluble, eutrophication, fertiliser, leaching, pasture, phosphorus, retention, sand, water soluble

Disciplines

Agricultural Science | Environmental Monitoring | Soil Science

Abstract

Context: Leaching of phosphorus (P) from water soluble agricultural fertilisers applied to sandy soil can adversely impact downstream water quality. Less soluble fertilisers may reduce P leaching and increase production. However, repeated application of low water soluble P (LWSP) fertiliser with high citrate soluble P (CSP) has potential to increase P leaching and P accumulation. Methods: We examined the effect of LWSP fertilisers (single superphosphate, SSP; fertilisers low in water soluble P, WSP) on leaching losses in soil with low P retention/low P status; with/without bauxite residue amendment and with/without plants. Key results: On low P retentive soils with a low P status, P leaching was reduced by reducing the WSP of fertiliser. Plants and soil amendment reduced P leaching further, but P loss remained proportional to WSP applied. Under field conditions, a subset of LWSP fertilisers greatly increased pasture dry matter production and increased soil test P values. Soil test P increases were positively correlated to fertiliser citrate soluble P content. Soils already containing at least 80% of the required plant available P did not require a WSP fertiliser to provide early season P. Conclusions: LWSP fertilisers and soil amendment have potential to reduce P leaching in low P retentive soils. Fertiliser formulations targeting reduced WSP and high CSP require attention. Implications: LWSP fertilisers may increase soil P residues reducing future P needs; however, ongoing soil testing is required for assessment of soil P accumulation, requirements and leaching potential.

Recommended Citation

Summers, R N, and Weaver, D. (2022), Lowering the water solubility of phosphorus fertilisers impacts leaching, plant growth and residual soil phosphorus. Soil Research, 61 (1), 20-36.
https://library.dpird.wa.gov.au/nrm_research/8