Thank you for sharing Lithos; it does make sense that a darker color would indicate a more decomposed product, since humus has that dark rich color. Having said that, wouldnt it be safe to say that a darker peat wouldnt harm a soil mix and could even help it by adding more humus - since this is a major goal in soil building. The aeration is already covered by perlite/pumice/lava rock etc so there so I dont think there would be a risk of a lack of oxygen.
Your observations definitely have me interested though, I think I will do some research as well. When I need more peat I will get some of the Premier brand and see what its like. I will be curious to see what you find out with the microscope; I dont have one yet but its on the list!
One more thing, what are the "properties" you speak of?
This thread is a lot of work!I've been researching spaghnum peat moss off & on all day.I guess this is my punishment for shooting off my mouth with an opinion without facts handy to back it up.
Here's basically what I learned:
Spaghnum peat moss is a great component of a soil mix for multiple reasons;moisture retention,high (110-130) CEC,it's own microbial contribution but the main reason seems to be for soil aeration and drainage.It's large fibrous particles allow air passage by separating small soil particles.Spaghnum peat is naturally resistant to decay due to phenolic compounds in the cell walls.Compost alone has much the same properties plus it provides nutrition but while it starts off nice & fluffy it decomposes into smaller & smaller particles relatively quickly leading to soil compaction=poor aeration and drainage.This resistance to decay make it valuable when growing plants that will occupy the soil for a longer period or if the soil is being recycled.
The website of the Quebec Peatmoss Producers Association was helpful regarding the grading by color - http://tourbehorticole.com/en/peat/index.php Color varies according to the age of the peat and it's carbon content.Younger peat is pale in color and has the lowest carbon content.Carbon content rises with age up to60%at which point it is in some places burnt for fuel.Peat which has decomposed into small unrecognizable particles is called peat humus.The relative colors are measured using the Von Post scale with 10 gradations designated H1 thru H10 with H1 being the lightest shade.Younger peat is considered the most desirable as it is least decayed and has the highest water retention capacity.As to possible changes in Cec as it decays I don't know.I'll leave the chemistry details for someone else more qualified.
No,I certainly don't think you'd do any harm using a darker peat still good but maybe not optimal.You of course don't have to use peat at all if you use other amendments with the same properties.I can't afford to order all the amendments I now crave but anything I do buy I'd like to be the best I can get.
IMO the big-box stores base their decisions on what products to carry based on the bottom line ,not necessarily what's the best,but what's adequate that they can buy a little cheaper,sell a little cheaper & move more units while improving their mark-up.
Clack says Fafard packs Majestic Earth but I can't help but wonder if this is the same product they sell under their own name to the horticulture biz.I doubt it.I've used Fafard 3b mix off & on for a while now and it's a quality product.This time I'm not junking it though,just a gentle remix with amendments.
I haven't made it out yet to collect any samples but I'm going to try & get as many different kinds as I can find locally.May not be easy,nobody seems to stock many garden supplies here in Ohio in Jan.
This thread leads me to some strange links:
http://www.wired.com/wiredscience/2009/08/bogosphere/