Indicating Diagnostic Horizons

Hey,

I just had a quick question in regards to indicating diagnostic horizons from the previous exams. For example:

For each soil listed below, also indicate the diagnostic horizon(s). (a) Ah C (7-40 cm) Ahb (40-48 cm) C (48-80 cm) (located on a floodplain with a good natural drainage, in a sub-humid climate)

I understand how to classify the soil order in these examples but always get confused how would you indicate the diagnostic horizon, would you indicate it by each layer or just by the top layer of the soil? Thanks

RazaKhataw (talk)‎

Raza, you need to give the 1 diagnostic horizon e.g. in a Luvisol the diagnostic horizon is Bt

in your example what you put as the diagnostic horizon?

SandraBrown (talk)‎

Hey,

I classifed this example as a Regesolic order and the diagnostic horizon is there is no B horizon present in this soil sample.

Would this be correct?

RazaKhataw (talk)‎

Yes, that is correct. This soil has no B horizon and it is a Regosol.

Additional info that would confirm this decision (ie that this is a Regolos) are: -presence of Ahb (ie buried horizon) at depth of the soil profile, and -location of this soil on a floodplain; hence, burial of the original Ah happened due to flooding event

MajaKrzic (talk)‎