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Plants have evolved with roots in close contact with the solid phase of the soil. Therefore, root exudates may be a better medium for extracting low molecular size (LMS) organic fractions than currently used alkaline solutions. Our objective was to compare the chemical and biological activity of LMS extracts using maize (Zea mays L.), Picea abies, and Pinus sylvestris root exudates to humic substances (HS) extracted with alkaline solution. Gas chromatographic/mass spectrometric (GC/MS) spectra revealed that the LMS fractions had a greater variety of fatty acids than the HS. Fourier transform infrared (FT‐IR) spectra of LMS fractions also indicated different amounts of functional groups by comparison with HS. The possible biological role of LMS fractions with respect to HS was assessed by measuring hormone‐like activity and nitrate uptake in P. sylvestris seedlings. The LMS fractions from agricultural soil stimulated …
Soil Science Society
Publication date: 
1 Nov 2005

S Nardi, M Tosoni, D Pizzeghello, MR Provenzano, A Cilenti, A Sturaro, R Rella, A Vianello

Biblio References: 
Volume: 69 Issue: 6 Pages: 2012-2019
Soil Science Society of America Journal