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RESEARCH ARTICLE
Contents Vol 47(1)

Fate of potassium fertilisers applied to clay soils under rainfed grain cropping in south-east Queensland, Australia

M. J. Bell A C , P. W. Moody B , G. R. Harch A , B. Compton B and P. S. Want A
+ Author Affiliations
- Author Affiliations

A Queensland Department of Primary Industries and Fisheries, PO Box 23, Kingaroy, Qld 4610, Australia.

B Queensland Department of Natural Resources and Water, Indooroopilly, Qld 4068, Australia.

C Corresponding author. Email: mike.bell@dpi.qld.gov.au

Australian Journal of Soil Research 47(1) 60-73 https://doi.org/10.1071/SR08088
Submitted: 21 April 2008  Accepted: 10 November 2008   Published: 18 February 2009

Abstract

Negative potassium (K) balances in all broadacre grain cropping systems in northern Australia are resulting in a decline in the plant-available reserves of K and necessitating a closer examination of strategies to detect and respond to developing K deficiency in clay soils. Grain growers on the Red Ferrosol soils have increasingly encountered K deficiency over the last 10 years due to lower available K reserves in these soils in their native condition. However, the problem is now increasingly evident on the medium-heavy clay soils (Black and Grey Vertosols) and is made more complicated by the widespread adoption of direct drill cropping systems and the resulting strong stratification of available K reserves in the top 0.05–0.1 m of the soil profile. This paper reports glasshouse studies examining the fate of applied K fertiliser in key cropping soils of the inland Burnett region of south-east Queensland, and uses the resultant understanding of K dynamics to interpret results of field trials assessing the effectiveness of K application strategies in terms of K availability to crop plants.

At similar concentrations of exchangeable K (Kexch), soil solution K concentrations and activity of K in the soil solution (ARK) varied by 6–7-fold between soil types. When Kexch arising from different rates of fertiliser application was expressed as a percentage of the effective cation exchange capacity (i.e. K saturation), there was evidence of greater selective adsorption of K on the exchange complex of Red Ferrosols than Black and Grey Vertosols or Brown Dermosols. Both soil solution K and ARK were much less responsive to increasing Kexch in the Black Vertosols; this is indicative of these soils having a high K buffer capacity (KBC). These contrasting properties have implications for the rate of diffusive supply of K to plant roots and the likely impact of K application strategies (banding v. broadcast and incorporation) on plant K uptake.

Field studies investigating K application strategies (banding v. broadcasting) and the interaction with the degree of soil disturbance/mixing of different soil types are discussed in relation to K dynamics derived from glasshouse studies. Greater propensity to accumulate luxury K in crop biomass was observed in a Brown Ferrosol with a KBC lower than that of a Black Vertosol, consistent with more efficient diffusive supply to plant roots in the Ferrosol. This luxury K uptake, when combined with crops exhibiting low proportional removal of K in the harvested product (i.e. low K harvest index coarse grains and winter cereals) and residue retention, can lead to rapid re-development of stratified K profiles.

There was clear evidence that some incorporation of K fertiliser into soil was required to facilitate root access and crop uptake, although there was no evidence of a need to incorporate K fertiliser any deeper than achieved by conventional disc tillage (i.e. 0.1–0.15 m). Recovery of fertiliser K applied in deep (0.25–0.3 m) bands in combination with N and P to facilitate root proliferation was quite poor in Red Ferrosols and Grey or Black Vertosols with moderate effective cation exchange capacity (ECEC, 25–35 cmol(+)/kg), was reasonable but not enough to overcome K deficiency in a Brown Dermosol (ECEC 11 cmol(+)/kg), but was quite good on a Black Vertosol (ECEC 50–60 cmol(+)/kg).

Collectively, results suggest that frequent small applications of K fertiliser, preferably with some soil mixing, is an effective fertiliser application strategy on lighter clay soils with low KBC and an effective diffusive supply mechanism. Alternately, concentrated K bands and enhanced root proliferation around them may be a more effective strategy in Vertosol soils with high KBC and limited diffusive supply. Further studies to assess this hypothesis are needed.


Acknowledgments

The authors would like to acknowledge the support of the Grains Research and Development Corporation through funding to DAQ00471, DAQ00063 and DAQ00084, and recognise the support from the many growers in the inland Burnett who allowed access to their farm to conduct long-term field trials. In particular, the support from the Bauer, Jones, Labuschewski, and Kearney families and the Chelmsford grower group is much appreciated.


References


Australian Agriculture Assessment (2001) Nutrient management in Australian agriculture. In ‘Australian agriculture assessment. Vol. 1’. (National Land and Water Audit: Canberra, ACT)

Barber SA (1985) Potassium availability at the soil–root interface and factors influencing potassium uptake. In ‘Potassium in agriculture’. (Ed. RD Munson) pp. 309–326. (ASA, CSSA, SSSA: Madison, WI)

Barber SA (1995) ‘Soil nutrient bioavailability—a mechanistic approach.’ (John Wiley and Sons Inc.: New York)

Barrow NJ (1967) Some aspects of the effects of grazing on the nutrition of pastures. Journal of the Australian Institute of Agricultural Science 33, 254–262. open url image1

Bedrossian S, Singh B (2004) Potassium adsorption characteristics and potassium forms in some New South Wales soils in relation to early senescence in cotton. Australian Journal of Soil Research 42, 747–753.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Bell MJ, Harch GR, Bridge BJ (1995) Effects of continuous cultivation on ferrosols in subtropical southeast Queensland. I. Site characterization, crop yields and soil chemical status. Australian Journal of Agricultural Research 46, 237–253.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Bell MJ , Moody PW (2001) Nitrogen, potassium, calcium and magnesium balances for dryland cropping systems (Burnett region, Queensland). In ‘Australian agriculture assessment. Vol. 1’. (National Land and Water Audit: Canberra, ACT)

Bell MJ , Moody PW , Harch GR , Want PW , Compton B (2005) Developing potassium fertiliser application strategies to address declining reserves in clay soils under rainfed cropping. In ‘Proceedings PotOz ’05: Second Workshop on Potassium in Australian Agriculture’. Melbourne.

Binnie RR, Barber SA (1964) Contrasting release characteristics of potassium in alluvial and associated upland soils in Indiana. Soil Science Society of America Proceedings 28, 387–409.
|  CAS |
open url image1

Carey PL , Metherell AK , Huen CG , Almond C (2000) Using an improved tetra-phenyl boron K method to measure westland soil K reserves. In ‘Soil research: A knowledge industry for land-based exporters’. Occasional Report No. 13. (Eds LD Currie, P Longanathan) pp. 247–257. (Fertilizer and Lime Research Centre, Massey University: Palmerston North, New Zealand)

Collett IJ (1997) Potassium surveys and extension in irrigated lucerne hay. In ‘Proceedings of the First Workshop on Potassium in Australian Agriculture’. Geraldton, W. Aust. (Eds MTF Wong, Y Pal, NK Edwards) pp. 47–55. (UWA Press: W. Aust.)

Crozier CR, Naderman GC, Tucker MR, Sugg RE (1999) Nutrient and pH stratification with conventional and no-till management. Communications in Soil Science and Plant Analysis 30, 65–74.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Edwards NK (1998) Potassium. In ‘Soilguide: a handbook for understanding and managing agricultural soils bulletin 4343’. (Ed. G Moore) pp. 176–180. (Agriculture Western Australia: Perth, W. Aust.)

Evangelou VP, Wang J, Phillips RE (1994) New developments and perspectives on soil potassium quantity/intensity relationships. Advances in Agronomy 52, 173–227.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Freebairn DM , Connolly RD , Dimes J , Wylie PB (1997) Crop sequencing. In ‘Sustainable crop production in the sub-tropics—an Australian perspective’. (Eds AL Clarke, PB Wylie) pp. 289–305. (Queensland Department of Primary Industries: Toowoomba, Qld)

Gray JM , Murphy BW (1999) Parent material and soils – A guide to the influence of parent material on soil distribution in Eastern Australia. Technical Report No. 45 (Reprinted 2002), NSW Department of Land and Water Conservation, Sydney. pp. 33–73.

Hanway JJ , Johnson JW (1985) Potassium nutrition of soybeans. In ‘Potassium in agriculture’. (Ed. RD Munson) pp. 753–764. (ASA, CSSA, SSSA: Madison, WI)

Isbell RF (1996) ‘The Australian Soil Classification.’ (CSIRO Publishing: Collingwood, Vic.)

Kovar JL, Barber SA (1987) Placing phosphorus and potassium for greatest recovery. Journal of Fertilizer Issues 4, 1–6. open url image1

Malavolta E (1985) Potassium status of tropical and subtropical region soils. In ‘Potassium in agriculture’. (Ed. RD Munson) pp. 164–194. (ASA, CSSA, SSSA: Madison, WI)

McKenzie N , Isbell R , Jacquier D , Brown K (2004) ‘Australian soils and landscapes: an illustrated compendium.’ pp. 362–387. (CSIRO Publishing: Collingwood, Vic.)

Mehta SC, Singh N, Singh M (1992) Effect of wetting and drying on the dynamics of potassium in some soils of Haryana. Journal of Potassium Research 8, 290–294. open url image1

Menzies NW, Bell LC (1988) Evaluation of the influence of sample preparation and extraction technique on soil solution composition. Australian Journal of Soil Research 26, 451–464.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Moody PW, Bell MJ (2006) Availability of soil potassium and diagnostic soil tests. Australian Journal of Soil Research 44, 265–275.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Pretty KM , Stangel PJ (1985) Current and future use of world potassium. In ‘Potassium in agriculture’. (Ed. RD Munson) pp. 753–764. (ASA, CSSA, SSSA: Madison, WI)

Rayment GE , Higginson FR (1992) ‘Australian laboratory handbook of soil and water chemical analyses.’ (Inkata Press: Sydney)

Reuter D , Duncombe-Wall D , Judson G (1997) Potassium balance in Australia’s broadacre industries: a contemporary national and regional analysis. In ‘Proceedings of the First Workshop on Potassium in Australian Agriculture’. Geraldton, W. Aust. (Eds MTF Wong, Y Pal, NK Edwards) pp. 1–8. (UWA Press: W. Aust.)

Reuter DJ , Robinson JB (1997) ‘Plant analysis: An interpretation manual.’ (CSIRO Publishing: Collingwood, Vic.)

Rich CI (1968) Mineralogy of soil potassium. In ‘The role of potassium in agriculture’. (Eds VJ Kilmer, SE Younts, NC Brady) pp. 79–108. (American Society of Agronomy: Madison, WI)

Syers JK (1998) ‘Soil and plant potassium in agriculture.’ (The Fertiliser Society: Newcastle upon Tyne, UK)

Wang X, Lester DW, Guppy CN, Lockwood PV, Tand C (2007) Changes in phosphorus fractions at various soil depths following long term P fertiliser application on a Black Vertosol from south-eastern Queensland. Australian Journal of Soil Research 45, 524–532.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Webb AA , Grundy MJ , Powell B , Littleboy M (1997) The Australian sub-tropical cereal belt: soils, climate and agriculture. In ‘Sustainable crop production in the sub-tropics—an Australian perspective’. (Eds AL Clarke, PB Wylie) pp. 8–23. (Queensland Department of Primary Industries: Toowoomba, Qld)

Welch LF , Flannery RL (1985) Potassium nutrition of corn. In ‘Potassium in Agriculture’. (Ed. RD Munson) pp. 753–764. (ASA, CSSA, SSSA: Madison, WI)

White J (2002) Potassium distribution in ferrosols and its influence on rain-fed crop production in the South Burnett region of Queensland. PhD Thesis, University of Queensland, Australia.

Wong MTF, Corner RJ, Cook SE (2001) A decision support system for mapping the site-specific potassium requirement of wheat in the field. Australian Journal of Experimental Agriculture 41, 655–661.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Wood AW , Schroeder BL (2004) Potassium: A critical role in sugarcane production, particularly in drought conditions. In ‘Proceedings, Australian Society of Sugarcane Technologists’ . No. 26. (CD-ROM)

Wright P (1999) Premature senescence of cotton: Predominantly a potassium disorder caused by an imbalance of source and sink. Plant and Soil 211, 231–239.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

Yin X, Vyn TJ (2003) Previous corn row effects on potassium nutrition and yield of subsequent no-till soybeans. Journal of Plant Nutrition 26, 1383–1402.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1