We gathered samples of the top soil and the substrate for texture tests.
First we remove all visible rocks and organic matter, spread the samples on newspaper, and let them dry for a couple of days. The next step is to pulverize the soil. You can put it into plastic bags and crush it with your hands or a rolling pin, for example. Remove any additional organic debris or rocks.
Then we put the soil into a jar (500 liters or a quart) until it’s about 1/4 to 1/3 full, add water until the jar is about 3/4 full, and add 1 tsp of castille or dish soap, something that doesn’t make too many suds. Typically, the recommendation is to use dishwasher detergent, but that is very expensive here in Poland. Shake for 10 or 15 minutes and set somewhere where it won’t be disturbed.
Within a few minutes the sand settles to the bottom of the jar. Within a few hours the silt settles on top of the sand. Within a few days the clay settles on top. That’s the theory. In practice, the results are not always clear. For the Pixxe Garden’s soil, the results were quite clear. For the SDK garden, this is what we found:
GARDEN BEDS have a Sandy Loam:
SUBSTRATE has either Sandy Clay or Sandy Silt — only two layers were really discernible: