This question came up in another thread: What is the difference between ortstein and placic horizons? Here is my general interpretation of these two diagnostic horizons. Please feel free to correct me if I am in error about any of these points. Below that is my opinion about the utility of having these two separate diagnostic horizons and suggestions for improving their use in taxonomy. Any andby JoshPaul - Soil Taxonomy Forum
ttcf, I will start a new thread on this topic (ortstein vs placic), since we are no longer talking about the illustrated guide. -Joshby JoshPaul - Soil Taxonomy Forum
I noticed that there was an error in the depiction of the placic horizon (section 3, page 113 and 114). As noted on pg 113, placic horizons may not be more than 25mm thick when associated with spodic materials. Page 114 then shows a 20cm thick “placic horizon” above a spodic horizon. I realize one could argue what the key words “associated with spodic materials” actually means, but I thinkby JoshPaul - Soil Taxonomy Forum