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Influence of sample depth on extractable nutrient concentrations, pH and the phosphorus buffering index of pasture soils in south-eastern Australia

Citation

Coad, Jessica and Burkitt, LL and Gourley, CJP, Influence of sample depth on extractable nutrient concentrations, pH and the phosphorus buffering index of pasture soils in south-eastern Australia, Australian Journal of Soil Research, 48, (4) pp. 355-360. ISSN 0004-9573 (2010) [Refereed Article]


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Copyright Statement

© CSIRO 2010

DOI: doi:10.1071/SR09104

Abstract

Pasture soils of mainland Australia are routinely sampled to a depth of 100 mm, whereas pasture soils of Tasmania and New Zealand are sampled to a depth of 75 mm. Despite this difference, there are no published studies to allow accurate conversion between the 2 sampling depths. This study was undertaken to examine the effect of soil sample depth (75 and 100 mm) on soil nutrient analyses: Olsen phosphorus (P), Colwell P, Colwell potassium (K), KCl40 sulfur (S), pH (H2O and CaCl2), and P buffering index (PBI+ColP). Our findings suggest that on most soil types, Olsen P, Colwell P, and Colwell K soil test results could use a generic factor of 1.17 when converting between 75 and 100 mm samples. More detailed equations including direct or indirect measures of soil texture and P sorption capacity were also determined. We found there was no significant difference in P and K concentrations between the different depths in soils which had very low P sorption capacities, high sand contents, and were located in high rainfall zones. Additionally, soil sampling depth generally had no effect on extractable S concentrations, pH, or PBI+ColP, and therefore no conversion is recommended for these soil tests for any soil type.

Item Details

Item Type:Refereed Article
Keywords:soil sampling depth, phosphorus, potassium, sulphur, pH, PBI+ColP, nutrient stratification.
Research Division:Environmental Sciences
Research Group:Soil Sciences
Research Field:Soil Chemistry (excl. Carbon Sequestration Science)
Objective Division:Animal Production and Animal Primary Products
Objective Group:Pasture, Browse and Fodder Crops
Objective Field:Sown Pastures (excl. Lucerne)
Author:Coad, Jessica (Ms Coad)
Author:Burkitt, LL (Dr Lucy Burkitt)
ID Code:57056
Year Published:2010
Web of Science® Times Cited:3
Deposited By:Agricultural Science
Deposited On:2009-06-15
Last Modified:2011-04-13
Downloads:0

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