Rapid method for assessment of soil structural stability by turbidimeter
Article
Article Title | Rapid method for assessment of soil structural stability by turbidimeter |
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ERA Journal ID | 5276 |
Article Category | Article |
Authors | Zhu, Yingcan (Author), Marchuk, Alla (Author) and Bennett, John McLean (Author) |
Journal Title | Soil Science Society of America Journal |
Journal Citation | 80 (6), pp. 1629-1637 |
Number of Pages | 9 |
Year | 2016 |
Publisher | John Wiley & Sons |
Place of Publication | United States |
ISSN | 0361-5995 |
1435-0661 | |
Digital Object Identifier (DOI) | https://doi.org/10.2136/sssaj2016.07.0222 |
Web Address (URL) | https://dl.sciencesocieties.org/publications/sssaj/abstracts/80/6/1629 |
Abstract | A rapid and inexpensive method to evaluate soil structural stability via assessment of soil clay dispersion is needed. Such a method would provide critical information for decision-making for soil and agricultural management not currently undertaken due to the expense of testing. The aim of this work was to validate the use of a turbidimeter for quantifying clay released from soil and to relate this back to dispersive parameters. Ten Australian soils with different physicochemical properties were studied. Six-step dilution was used to adjust the clay suspensions sequentially by dilution from a datum concentration of 4000 nephelometric turbidity units (NTU). The linearity of turbidity by dilution was verified, considering the effects of soil color and mean particle size. There was a strong correlation between turbidity (NTU) and dispersed clay (mg L-1, % of soil) for each soil. Clay particle size was related to turbidity response, although the coefficients between turbidity and dispersed clay were very close irrespective of mean particle size differences. Dispersed clay was concluded to be accurately quantified using a turbidimeter after spontaneous and mechanical dispersion. A semi-quantitative dispersion assessment chart was developed for rapid assessment of soil structural stability, the application of which is intended to provide rapid diagnosis and to act as an important index for soil management practitioners. Additionally, when dispersed clay was combined with electrical conductivity and clay content parameters, the dispersive indices (cation ratio of soil structural stability and exchangeable dispersive percentage) were reasonably predicted at a resolution useful for farm management decisions. |
Keywords | CROSS; cation ratio of soil structural stability; EC; electrical conductivity; EDP; exchangeable dispersive percentage; ESP; exchangeable sodium percentage; NTU; nephelometric turbidity units; SAR; sodium adsorption ratio |
ANZSRC Field of Research 2020 | 410605. Soil physics |
410404. Environmental management | |
300202. Agricultural land management | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | National Centre for Engineering in Agriculture |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q3vxx/rapid-method-for-assessment-of-soil-structural-stability-by-turbidimeter
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