← Elaine Ingham · Research and publications
Organic and conventional farming through the lens of soil life
Paired fields in Oregon revealed different communities of bacteria, fungi and small soil animals, alongside seasonal changes.
Study published:
Samples from paired systems
Wu, Hu and Ingham periodically compared surface soil samples from paired organic and conventional fields in Corvallis. They examined microorganisms and soil fauna in relation to management and season. [1]
Different groups responded differently
Organic soils contained more bacteria, certain protozoa, springtails and several nematode groups, including plant parasites. Conventional soils had greater total fungal biomass and some fungal-feeding mites. Moisture was associated with seasonal fluctuations. [1]
Functional groups matter
The comparison encourages us to examine community composition. Which organisms increase? What do they eat? How do they relate to the crop? These questions give biological assessment practical meaning.
Usefulness for our fields
Our olive groves and trials benefit from comparable sampling, moisture records and seasonal repetition. Every field has a management history. Following that history helps us interpret changes in soil life.
Sources and references
- Wu, S.M., Hu, D.X. & Ingham, E.R. (2005). Comparison of soil biota between organic and conventional agroecosystems in Oregon, USA. Pedosphere, 15(3), 395–403. Original publication and study record