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RESEARCH ARTICLE
Contents Vol 47(1)

Positive charge discovered across Western Australian wheatbelt soils challenges key soil and nitrogen management assumptions

M. T. F. Wong A B and K. Wittwer A
+ Author Affiliations
- Author Affiliations

A CSIRO, Private Bag 5, Wembley, WA 6913, Australia.

B Corresponding author. Email: mike.wong@csiro.au

Australian Journal of Soil Research 47(1) 127-135 https://doi.org/10.1071/SR08098
Submitted: 28 April 2008  Accepted: 4 December 2008   Published: 18 February 2009

Abstract

Nitrogen management in Western Australia (WA) and in cropping areas elsewhere in Australia assumes that soil contains negligible or no positive charge and is therefore unable to retain nitrate against leaching. The amount of water needed to displace nitrate is thus assumed to be the drainable volume of water held by the soil (1 pore volume), and in sandy soils about 100 mm drainage is assumed to be required to displace nitrate by 1 m. The clay mineralogy of the highly weathered soils of the WA wheatbelt is dominated by kaolinite and iron and aluminium oxides. This mineralogy suggests likely occurrence of positive charge and anion exchange capacity (AEC), since these minerals can carry positive charge under normal acidic field situations. We measured AEC of soils sampled widely across the WA wheatbelt by independent leaching and batch equilibration methods of charge measurement. This showed widespread occurrence of positive charge and AEC in these soils. AEC ranged from 0 to 2.47 mmolc/kg and is linearly correlated with the potassium chloride or monocalcium phosphate extractable sulfate content of the soil. This correlation provides a rapid screening method to identify soils with positive charge. Application of ion-chromatographic theory showed that AEC has a large effect in delaying nitrate leaching by up to 12.5 pore volumes. The most highly charged soil (2.47 mmolc/kg) thus needed 12.5 times more water to displace nitrate than currently assumed. This potentially large delay in nitrate leaching affects the optimum amount and time of fertiliser application, rates of soil acidification attributed to nitrate leaching and the benefit of ameliorating subsoils to allow roots access to subsoil water and leached nitrate. It also calls into question the use of anions such as bromide to trace water flow and estimate recharge in these soils.

Additional keywords: anion exchange capacity, AEC, leaching delay, nitrate adsorption, pore volume, variable charge, charge : sulphate ratio.


Acknowledgement

We are grateful to the GRDC for co-funding this work with CSIRO. Rajesh Sharma of Murdoch University did the citrate, oxalate, and pyrosphate extractable aluminium and iron contents reported here.


References


Asseng S, Fillery IRP, Anderson GC, Dolling PJ, Dunin FX, Keating BA (1998) Use of the APSIM wheat model to predict yield, drainage, and NO3 − leaching for a deep sand. Australian Journal of Agricultural Research 49, 363–377.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Blair GJ, Chinoim N, Lefroy RDB, Anderson GC, Crocker GJ (1991) A sulfur test for pastures and crops. Australian Journal of Soil Research 29, 619–626.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Bolland MDA, Posner AM, Quirk JP (1976) Surface charge on kaolinites in aqueous suspension. Australian Journal of Soil Research 14, 197–216.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Bolland MDA, Windsor DP (2007) Converting reactive iron, reactive aluminium, and phosphorus retention index (PRI) to the phosphorus buffering index (PBI) for sandy soils of south-western Australia. Australian Journal of Soil Research 45, 262–265.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Bowden JW, Posner AM, Quirk JP (1977) Ionic adsorption on variable charge mineral surfaces. Theoretical-charge development and titration curves. Australian Journal of Soil Research 15, 121–136.
|  CAS |
open url image1

Clay DE, Zheng Z, Liu Z, Clay SA, Trooien TP (2004) Bromide and nitrate movement through undisturbed soil columns. Journal of Environmental Quality 33, 338–342.
|  CAS | PubMed |
open url image1

Donn MJ, Menzies NW (2005a) Simulated rainwater effects on anion exchange capacity and nitrate retention in Ferrosols. Australian Journal of Soil Research 43, 33–42.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Donn MJ, Menzies NW (2005b) The effect of ionic strength variation and anion competition on the development of nitrate accumulations in variable charge subsoils. Australian Journal of Soil Research 43, 43–50.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Donn MJ, Menzies NW, Risiah V (2004) Chemical characterisation of deep profile Ferrosols under sugarcane in wet tropical northern Queensland. Australian Journal of Soil Research 42, 69–77.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Gerritse RG, Adeney JA (1992) Tracers in recharge – effects of partitioning in soils. Journal of Hydrology 131, 255–268.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Gilkes RJ, Hughes JC (1994) Sodium fluoride pH of South-western Australian soils as an indicator of P-sorption. Australian Journal of Soil Research 32, 755–766.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Gillman GP (2007) An analytical tool for understanding the properties and behaviour of variable charge soils. Australian Journal of Soil Research 45, 83–90.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Gillman GP, Sumpter EA (1986) Surface charge characteristics and lime requirements of soils derived from basaltic, granitic and metamorphic rocks in high-rainfall tropical Queensland. Australian Journal of Soil Research 24, 173–192.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

McArthur WM (2004) ‘Reference soils of south-western Australia.’ (Eds DAW Johnston, LJ Snell) (Australian Society of Soil Science Incorporated (Western Australian Branch): Perth, W. Aust.)

McKenzie NJ , Jacquier D , Isbell R , Brown K (2004) ‘Australian soils and landscapes. An illustrated compendium.’ (CSIRO Publishing: Collingwood, Vic.)

Moody PW , Cong PT (2007) SCAMP: A decision support system for sustainable soil management of upland soils. In ‘Field and Laboratory Handbook and Interpretative Guidelines’. ACIAR Technical Report. (Australian Centre for International Agricultural Research: Canberra)

Mott CJB (1988) Surface chemistry of soil particles. In ‘Russell’s soil conditions and plant growth’. 11th edn (Ed. A Wild) pp. 239–281. (Longman: Essex, UK)

Qafoku NP, van Ranst E, Noble A, Baert G (2004) Variable charge soils: their mineralogy, chemistry and management. Advances in Agronomy 84, 159–215.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Rasiah V, Armour JD, Menzies NM, Heiner DH, Donn MJ (2004) Impact of pre-existing sulphate on retention of imported chloride and nitrate in variable charge soil profiles. Geoderma 123, 205–218.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Rasiah V, Armour JD, Menzies NM, Heiner DH, Donn MJ, Mahendrarajah S (2003) Nitrate retention under sugarcane in wet tropical Queensland deep soil profiles. Australian Journal of Soil Research 41, 1145–1161.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Rayment GE , Higginson FR (1992) ‘Australian laboratory handbook of soil and water chemical methods – Australian soil and land survey handbook.’ (Inkata Press: Melbourne, Vic.)

Robertson MJ, Isbister B, Maling I, Oliver Y, Wong MTF, Adams M, Bowden JW, Tozer P (2007) Opportunities and constraints for managing within-field spatial variability in Western Australian grain production. Field Crops Research 104, 60–67.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Tabatabai MA (1982) Sulfur. In ‘Methods of soil analysis. Part 2. Chemical and microbiological properties’. 2nd edn (Eds AL Page, RH Miller, DR Keeney) pp. 501–538. (American Society of Agronomy, Inc., Soil Science Society of America Inc.: Madison, WI)

Verberg K , Braschkat J , Hochman Z , Moore AD , Helyar KR , Probert ME , Hargreaves JNG , Simpson RJ (2003) Modelling acidification processes in agricultural systems. In ‘Handbook of soil acidity’. (Ed. Z Rengel) pp. 135–187. (Marcel Dekker, Inc.: New York)

Wild A (1981) Mass flow and diffusion. In ‘The Chemistry of soil processes’. (Eds DJ Greenland, MHB Hayes) pp. 37–80. (Wiley: Chichester, UK)

Wong MTF, Asseng S (2007) Yield and environmental benefits of ameliorating subsoil constraints under variable rainfall in a Mediterranean environment. Plant and Soil 297, 29–42.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Wong MTF, Asseng S, Robertson MJ, Oliver Y (2008) Mapping subsoil acidity and shallow soil across a field with information from yield maps, geophysical sensing and the grower. Precision Agriculture 9, 3–15.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Wong MTF, Asseng S, Zhang H (2006) A flexible approach to managing variability in grain yield and nitrate leaching at within-field to farm scales. Precision Agriculture 7, 405–417.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Wong MTF , Hairiah K , Alegre J (2004) Managing soil acidity and aluminium toxicity in tree-based agroecosystems. In ‘Below-ground interactions in tropical agroecosystems. Concepts and models with multiple plant components’. (Eds M Van Noordwijk, G Cadisch, CK Ong) pp. 143–156. (CABI Publishing: Oxfordshire, UK)

Wong MTF, Hughes R, Rowell DL (1990a) Retarded leaching of nitrate in acid soils from the tropics: measurement of the effective anion exchange capacity. Journal of Soil Science 41, 655–663.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Wong MTF, Hughes R, Rowell DL (1990b) The retention of nitrate in acid soils from the tropics. Soil Use and Management 6, 72–74.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Wong MTF, van der Kruijs ACBM, Juo ASR (1992) Leaching loss of calcium, magnesium, potassium and nitrate derived from soil, lime and fertilizers as influenced by urea applied to undisturbed lysimeters in south-east Nigeria. Fertilizer Research 31, 281–289.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Wong MTF, Wild A, Juo ASR (1987) Retarded leaching of nitrate measured in monolith lysimeters in south-east Nigeria. Journal of Soil Science 38, 511–518.
| Crossref | GoogleScholarGoogle Scholar | open url image1