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Chemical Characteristics and Biological Activity of Organic Substances Extracted from Soils by Root Exudates

^a Dipartimento di Biotecnologie Agrarie, Università di Padova, Facoltà di Agraria,-Agripolis, Viale dell'Università 16, 35020 Legnaro, Padova, Italy
^b Dipartimento di Biologia e Chimica Agroforestale ed Ambientale, Università di Bari, Via Amendola 165/A, 70126 Bari, Italy
^c Consiglio Nazionale delle Ricerche, Corso Stati Uniti 4, I-35127 Padova, Italy
^d Dipartimento di Biologia ed Economia Agro-industriale, Sezione di Biologia Vegetale, Università di Udine, Via Cotonificio 108, 33100 Udine, Italy

View larger version (24K): [in a new window]   Fig. 1. FT-IR spectra of Mytos (a), Sandek (b), Norway spruce (c), and Scotch pine (d) root exudates.

View larger version (14K): [in a new window]   Fig. 2. FT-IR spectra of aqueous soil extracts from the Eutric Cambisol (EC) (a) and Rendzic Leptosol (RL) (b).

View larger version (16K): [in a new window]   Fig. 3. FT-IR spectra of aqueous soil extract from Eutric Cambisol (EC) (a) and extracts obtained by treating EC with P. sylvestris (b) and P. abies (c) root exudates.

View larger version (17K): [in a new window]   Fig. 4. FT-IR spectra of aqueous soil extract from Rendzic Leptosol (RL) (a) and extracts obtained by treating RL with P. sylvestris (b) and P. abies (c) root exudates.

View larger version (17K): [in a new window]   Fig. 5. FT-IR spectra of aqueous soil extract from Eutric Cambisol (EC) (a) and extracts obtained by treating EC with Sandek (b) and Mytos (c) root exudates.

View larger version (16K): [in a new window]   Fig. 6. FT-IR spectra of aqueous soil extract from Rendzic Leptosol (RL) (a) and extracts obtained by treating RL with Mytos (b) and Sandek (c) root exudates.