Pedosphere 27(1): 86--95, 2017
ISSN 1002-0160/CN 32-1315/P
©2017 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Frequent applications of organic matter to agricultural soil increase fungistasis
G. BONANOMI1, S. A. GAGLIONE1, G. CESARANO1, T. C. SARKER1, M. PASCALE1, F. SCALA1 and A. ZOINA2
1Dipartimento di Agraria, Università di Napoli Federico II, via Università 100, 80055 Portici (Italy)
2CNR-Istituto per la Protezione Sostenibile delle Piante, via Università 133, 80055 Portici (Italy)
ABSTRACT
      Soil-borne plant pathogens are among the most important limiting factors for the productivity of agro-ecosystems. Fungistasis is the natural capability of soils to inhibit the germination and growth of soil-borne fungi in the presence of optimal abiotic conditions. The objective of this study was to assess the effects of different soil managements, in terms of soil amendment types and frequency of application, on fungistasis. For this purpose, a microcosm experiment was performed by conditioning a soil with frequent applications of organic matter with contrasting biochemical quality (i.e., glucose, alfalfa straw and wheat straw). Thereafter, the fungistasis response was assessed on four fungi (Aspergillus niger, Botrytis cinerea, Pyrenochaeta lycopersici and Trichoderma harzianum). Conditioned soils were characterized by measuring microbial activity (soil respiration) and functional diversity using the BIOLOG EcoPlatesTM method. Results showed that irrespective of the fungal species and amendment types, frequent applications of organic matter reduced fungistasis relief and shortened the time required for fungistasis restoration. The frequent addition of easily decomposable organic compounds enhanced soil respiration and its specific catabolic capabilities. This study demonstrated that frequent applications of organic matter affected soil fungistasis likely as a result of higher microbial activity and functional diversity.
Key Words:  organic C, biological control, disease suppression, microbial activity, microbial functional diversity, soil-borne pathogens
Citation: Bonanomi, G., Gaglione, S. A., Cesarano, G., Sarker, T. C., Pascale, M., Scala, F. and Zoina, A. 2017. Frequent applications of organic matter to agricultural soil increase fungistasis. Pedosphere. 27(1): 86-95.
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