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Can repeated soil amendment with biogas digestates increase soil suppressiveness toward non-specific soil-borne pathogens in agricultural lands?

Published online by Cambridge University Press:  17 December 2020

L. M. Manici*
Affiliation:
Council of Agricultural Research and Economics (CREA), Research Centre of Agriculture and Environment, Via di Corticella 133, 40128Bologna, Italy
F. Caputo
Affiliation:
Council of Agricultural Research and Economics (CREA), Research Centre of Agriculture and Environment, Via di Corticella 133, 40128Bologna, Italy
G. A. Cappelli
Affiliation:
Council of Agricultural Research and Economics (CREA), Research Centre of Agriculture and Environment, Via di Corticella 133, 40128Bologna, Italy
E. Ceotto
Affiliation:
Council of Agricultural Research and Economics (CREA), Research Centre of Agriculture and Environment, Via di Corticella 133, 40128Bologna, Italy
*
Author for correspondence: L. M. Manici, E-mail: [email protected]

Abstract

Soil suppressiveness which is the natural ability of soil to support optimal plant growth and health is the resultant of multiple soil microbial components; which implies many difficulties when estimating this soil condition. Microbial benefits for plant health from repeated digestate applications were assessed in three experimental sites surrounding anaerobic biogas plants in an intensively cultivated area of northern Italy. A 2-yr trial was performed in 2017 and 2018 by performing an in-pot plant growth assay, using soil samples taken from two fields for each experimental site, of which one had been repeatedly amended with anaerobic biogas digestate and the other had not. These fields were similar in management and crop sequences (maize was the recurrent crop) for the last 10 yr. Plant growth response in the bioassay was expressed as plant biomass production, root colonization frequency by soil-borne fungi were estimated to evaluate the impact of soil-borne pathogens on plant growth, abundance of Pseudomonas and actinomycetes populations in rhizosphere were estimated as beneficial soil microbial indicators. Repeated soil amendment with digestate increased significantly soil capacity to support plant biomass production as compared to unamended control in both the years. Findings supported evidence that this increase was principally attributable to a higher natural ability of digestate-amended soils to reduce root infection by saprophytic soil-borne pathogens whose inoculum was increased by the recurrent maize cultivation. Pseudomonas and actinomycetes were always more abundant in digestate-amended soils suggesting that both these large bacterial groups were involved in the increase of their natural capacity to control soil-borne pathogens (soil suppressiveness).

Type
Research Paper
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press

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