Journal
AUSTRALIAN JOURNAL OF SOIL RESEARCH
Volume 48, Issue 4, Pages 355-360Publisher
CSIRO PUBLISHING
DOI: 10.1071/SR09104
Keywords
soil sampling depth; phosphorus; potassium; sulphur; pH; PBI(+ColP); nutrient stratification
Categories
Funding
- Dairy Australia
- Impact Fertilisers Australia Proprietary Limited
- Incitec Pivot Limited
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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), KCl(40) sulfur (S), pH (H(2)O and CaCl(2)), 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 100mm 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.
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