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Title Use of Biosolids to Enhance Tomato Growth and Tolerance to Fusarium oxysporum f. sp. radicis-lycopersici
ID_Doc 14149
Authors Giannakis, I; Manitsas, C; Eleftherohorinos, I; Menexes, G; Emmanouil, C; Kungolos, A; Lagopodi, AL
Title Use of Biosolids to Enhance Tomato Growth and Tolerance to Fusarium oxysporum f. sp. radicis-lycopersici
Year 2021
Published Environmental Processes-An International Journal, 8, 4
Abstract The European Green Deal proposes the reuse of any kind of waste that can be safely repurposed; sludge may also be reused as a biosolid. The present research aims to evaluate a biosolid made from sludge, originating from a wastewater treatment plant (WWTP) for its effect on tomato growth and enhancement of tolerance against the phytopathogenic fungus Fusarium oxysporum f. sp. radicis-lycopersici (Forl). Peat and/or two soil types were amended with biosolid (0, 80 and 160 tons/ha) to form substrates on which tomato plants were grown either under controlled conditions, in a growth chamber or outdoors, in a net protected area. Plant growth and disease parameters were recorded 4-7 weeks after application of Forl inoculum in the substrates. Results showed that biosolid addition enhanced plant growth and increased tolerance against tomato foot and root rot caused by Forl. Specifically, fresh weight, root weight, stem height and leaf number of tomato plants in Forl-inoculated soils that had received biosolid, were increased when compared to Forl-inoculated control soils. Forl resulted in higher disease severity on plants grown outdoors in biosolid plus clay soil than in biosolid plus sandy soil, while the opposite occurred under controlled conditions where higher disease index was recorded on plants grown in peat plus sandy soil than in peat plus clay soil. These findings strongly suggest that this biosolid may act as an organic fertilizer and possible stimulant of tomato tolerance against Forl, and the effect is soil type dependent. Therefore, this biosolid should be considered for its possible use in agriculture according to the principles of circular economy and waste minimization.
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