What 2000 Buried Underpants Revealed About Where Soil Is Most Alive
studyfinds.com
studyfinds.com
A very simple question: why not directly using cotton fabric cuts?
"Buy this item made out of this material, bury two of them in the ground" requires no further cutting or measuring, and most people would have to go to the store to buy a cut of cotton fabric anyway.
This particular clothing item also contains a more resistant skeleton of fibers against which to compare when the test material is heavily decomposed. This is how the "10 point decomposition scale" functions, and a single cotton square would not facilitate that.
Finally, it's novel, which entices potential participants to complete the survey.
>Researchers have used cotton strips and specialty tea bags for similar purposes before, but those methods require precise scales and careful handling. A pair of underwear, by contrast, offers something immediate: anyone can look at what came out of the ground and grasp what it means.
The linked manuscript basically says the same:
>Cotton strips have previously been applied (Harrison et al., 1988; Nachimuthu et al., 2007), while the Tea Bag Index (TBI) makes use of commercially available teabags with standardized composition for the same purpose (Keuskamp et al., 2013). Due to the wide availability of the material, the TBI has been employed in a citizen science approach to gather global decomposition data (Sarneel et al., 2024). However, despite being relatively easy to apply and interpret, the method requires careful handling and specific tools, such as a fine scale balance. Moreover, it lacks visual appeal and may struggle to attract broader public attention for soil-related topics. A more playful approach that has occasionally been used to illustrate soil decomposition, though without scientific rigor, is the burial of cotton underpants (Figure 1).
It looks like establishing cotton underwear as a viable method was exactly the point of this study. As they say, "This work demonstrates that underwear decomposition varied widely across land-use types and that buried underwear is a simple and easily interpretable tool to gain a first impression of soil health."
It's trivially easy to bury like-sized cuts of cotton (an old dress shirt would source several), while cotton underpants will vary in fiber content (none are 100% cotton today; they have elastic bands), size, and possibly mercerization.
So can old shirts, those are bigger and harder to bury straight up and down, and have no identifying marks (underwear does have the rubber, which acts as a skeleton and frame of reference for what you're actually looking at; cotton squares don't).
Sure, the data might be slightly noisier, but right now they have no data. And that's even worse.
Researchers are careful to note that the Underpants Index most strongly reflects soil fertility, meaning nutrient availability, rather than soil health in the fullest sense. A soil loaded with nutrients will break down cotton fast, but that does not automatically mean the soil is in good ecological condition. In natural ecosystems like meadows or forests, very high nutrient levels often signal human disturbance, not health, and can drive out rare plant species.
Step 1: Collect underpants Step 2: ????? Step 3: Proft!
So he's joking that these guys have figured out the step 2 finally, so the gnomes can profit from collecting underpants.
Also, the very notion that agriculture depends on underpants for studying soil, is - while entertaining - rubbish nonsense. For decomposition studies you typically use thorough material with consistent dimensions etc... like a rectangle of, say, 10cm x10cm, but even that is rarely done. This here really seems fake research.