Soó's T: temperature requirement (1–5, 0)
1 – highly cold-tolerant plants, arctic, alpine species
2 – cold-tolerant plants
3 – slightly cold-tolerant plants
4 – cold-sensitive, heat-demanding plants
5 – highly heat-demanding plants
0 – indifferent species
Soó's F: soil moisture requirement (1-5, 0)
1 – plants living in extremely dry habitats
2 – plants mostly living in dry habitats, but occasionally occurring in mesophilous habitats
3 – plants living in moderately wet habitats
4 – plants living in wet habitats that sometimes dry out
5 – plants living in constantly wet habitats
0 – indifferent species
Soó's R: soil reaction, or Calcium-demand (1-5, 0)
1 – calciphobe plants living in highly acidic soils
2 – plants living in moderately acidic soils, avoiding Ca in the soil
3 – plants living in neutral soils, avoiding Ca in the soil
4 – plants living in neutral soils
5 – plants living in basic soils
0 – indifferent species
Soó's N: nitrogen requirement (1-5, 0)
1 – plants always living in nitrogen-poor habitats
2 – plants mostly living in nitrogen-poor habitats
3 – plants requiring average nitrogen amounts
4 – plants living in nitrogen-rich, well fertilized soils
5 – plants living in highly nitrogen-rich, overfertilized soils
0 – indifferent species
Data source and citation:
Horváth, F., Dobolyi, K., Morschhauser, T., Lőkös, L., Karas, L., & Szerdahelyi, T. (1995) Flóra adatbázis 1.2. Taxon-lista és attribútum állomány. Vácrátót: MTA ÖBKI. [Flora database 1.2, List of taxa and attributes.]
Sonkoly, J., Tóth, E., Balogh, N., Balogh, L., Bartha, D. ... Török, P. (2022) PADAPT 1.0 – the Pannonian Database of Plant Traits. bioRxiv, doi: https://doi.org/10.1101/2022.12.05.519136
Soó, R. (1964-1980) A magyar flóra és vegetáció rendszertani-növényföldrajzi kézikönyve, I-VI. Akadémiai Kiadó, Budapest.
