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ANZSoilData / def-au-spmile

Preparation and maintenance of a machine-readable representation of soil physical methods, including Concept Scheme the soil physical measurement methods described in Soil Physical Measurement and Interpretation for Land Evaluation. Keppel K. Coughlan; HAmish H Cresswell; Niel N. McKenzie. Publisher CSIRO Copyright 2002.
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definitions of bulk density v gross bulk density #10

Closed meganrwong closed 8 months ago

meganrwong commented 1 year ago

bulk density is the mass of bulk material in a given volume Clarifying - How does property bulk density differ from gross bulk density?

methods 503.01 - 0.4 in the brown book exclude the coarse fragment fraction of soil - this measures observed property bulk density wheras method 503.05 'Soil with coarse fragments: Gross bulk density (fine earth and course fragments)' - measures observed property gross bulk density'. Right?

@ljgregory @GGrealish @abhritchie

GGrealish commented 1 year ago

I don't have a brown book to check - is it online somewhere to download? from what you have written seems like gross BD is the whole (fine and coarse) - from my way of thinking that could be obtained using a core property BD looks like they have picked out the coarse frags - I suspect this would be a repacked core of fine earth.

But would need to read the methods to confirm

meganrwong commented 1 year ago

Thanks Gerard.

I re-read the method 503.01 - 0.4 . They don't have coarse frags removed (whole cores, no sieving). It is just that these methods read as not recommended for soils with coarse frags. Method 503.05 is recommended for soils with coarse frags.

So, here 'bulk density' and 'gross bulk density' seem to be talking about the same property (the mass of bulk material in a given volume- of whole soil (coarse and fine fractions).

Unless your library has, you purchase from here if interested https://www.publish.csiro.au/book/3147/

meganrwong commented 8 months ago

Can't see that there is something to fix here in the vocab. Closing