Soil Jar Test
So I'm not quite getting results as I expected from the jar test... not sure if there is some procedural error, or if this is just what my soil is.
I have two samples, front and back yard. I added some laundry soap (probably too much), a good 2 inches or so of soil, and near filled the bottle with water. I shook each for at least 5 minutes.
I am not seeing any sand settling in 60 seconds. What I see is more like a silt layer settling out in about 2 minutes, with no visible layer of sand settling out more quickly. In other words, either I am looking at a silt layer that settled out in 2 minutes instead of 2 hours, or I am looking at a sand layer that took its good ole time settling out. I don't believe this is sand because I'd have to be at the beach. It looks to me like I have nearly 100% silt. Clay is still settling 2 days later, but it won't amount to that much.
Now, as far as sample method - this is the soil left over from core samples sent to Logan Labs (results due any day now). The core samples were typically 4 inches, sometimes probably closer to 3 inches. I realized this test is useful for drainage questions, so I don't know if 4 inches is really deep enough for that. On the other hand if the test is for soil quality in the root region, then I did the right thing depth-wise?
Check out this quite boring video. The separation becomes clear around 1 min 30 seconds. Total video is about 2 minutes. Anything look strange about this? (OK, brilliant Gardenweb forum software doesn't seem to allow video imbeds. Please copy and paste the link below).
P.S. Check out my next exciting video, "Paint Drying," coming soon!