Key points:
- The activity and diversity of soil microbes can be measured using simple and inexpensive methods, such as the T-shirt degradation test.
- Terra Nostra Foundation, together with partners, decided to use the T-shirt degradation test to check the impact of regenerative practices on the activity of soil microbes.
- The BIOTREX95 analysis revealed differences in microbial activity and diversity between conventional and regenerative fields.
- After three months in the soil, the rate of decomposition of the T-shirts was in line with the results of the BIOTREX analysis.
In summary, the T-shirt test proved to be a simple and inexpensive way to qualitatively assess activity of soil microbes. However, it has some limitations. Firstly, you need a lot of patience to wait few months for the results. Secondly, you have to spend a lot more time and energy burying the T-shirts and then digging them up than you do taking samples of the soil for laboratory testing. Also, if the decomposition rate of the soil is high, it may be quite difficult to find the remains of the T-shirt. Finally, it only provides approximate estimates, and comparing results over time and across different fields is challenging. For professional use, where thorough and quantitative results are essential, it is better to use advanced and reliable methods such as BIOTREX.