Download Interpreting Soil Test Results: What Do All the Numbers by Pam Hazelton, Brian Murphy PDF

By Pam Hazelton, Brian Murphy

Interpreting Soil try Results is a pragmatic reference if you have to interpret effects from laboratory research of soil. It has a complete directory of the soil homes correct to so much environmental and typical land source concerns and investigations.

The precursor to this booklet, What Do the entire Numbers Mean?, often called The Numbers Book, was once generic and permitted for examining soil try effects. This re-creation has been thoroughly up to date and lots of sections were accelerated, quite these on acid sulfate soils and soil salinity. it's a convenient and simple advisor to interpretation of the numbers linked to a variety of soil exams

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Extra info for Interpreting Soil Test Results: What Do All the Numbers Mean?

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7 23 Further reading Cass (1999). 1 Soil strength Soil strength determines the resistance of soil to failure or shearing. In order to grow, plant roots often need to shear the soil. The value of soil strength that limits root growth depends upon how the soil strength is measured. The soil strength is very dependent on the moisture content at which it is measured and this needs to be taken into account when interpreting results. The units used for soil strength are commonly kiloPascals (kPa), or in the case of high soil strength, megaPascals (MPa).

1993). 12. g. Krasnozem or Dermosol. 0 Adapted from Geeves et al. (2007a). 13. 5 extremely low Suitable for water storage (1). 5–10 very low Likely to cause regular runoff under rainfall; irrigation likely to be inefficient (2). 10–20 low Runoff less regular (3) and soil is becoming suitable for irrigation (4). Interpretation 20–60 moderate Runoff only occasional and soil is suitable for irrigation. 60–120 high Runoff rarely occurs and soil is becoming too permeable for irrigation (5). >120 very high If soil is used for effluent or waste disposal there may be potential problems with contamination of water tables (6).

1997) Very high High High to moderate Moderate Slight Negligible/aggregated 1 and 2 (3) 2 (2) 2 (1) 3 (4) and 3 (3) 3 (2), 3 (1) and 5 4, 6, 7, 8 12–16 10–12 9–10 5–8 0–4 0 Source: Charman (1978); Field et al. (1997). 25. Applications of Emerson aggregate test *, amount of susceptibility depends on permeability and resistance to cracking and slumping; **, laboratory tests need to be carried out to determine suitability for earthworks or requirements for ameliorants; ***, if total dispersed clay (approximate clay percentage × dispersion percentage) falls below 5%, the material is likely to leak if used for earthworks.

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