Chitin- and keratin-rich soil amendments suppress Rhizoctonia solani disease via the soil microbiome



More organic products are becoming available for their application in agriculture and they have shown positive effects on crop protection and plant productivity. However their effects are not consistent and easily reproducible. It would be of interest to develop a tailor-made pipeline to select the best treatment (organic amendment and/or microbial consortia) to increase suppressiveness against a specific pathogen. To achieve this a further insight into the mechanism behind pathogen suppression in soil is needed. This mechanism is generally not well understood, and the organic amendments efficacy is unpredictable. Dosage, product properties, soil type, and pathogen-specificity are factors affecting suppressiveness. In order to better understand the mechanisms behind the stimulation of soil suppressiveness via the addition of organic products and what specific factors can be traced as disease suppressiveness markers, the following questions are being addressed: (1) which type of organic products amended to the soil have the potential to stimulate disease suppressiveness?, (2) how do the organic products alter the soil microbiome?, (3) how does this disease suppression correlate with biological and physico-chemical soil properties?, (4) are there specific soil indicators (microorganisms and/or biological or physico-chemical soil parameters) that can predict soil suppressiveness?</p><p>To address these questions, ten organic products with different characteristics (variation in C:N ratio and decomposition speed) were selected to assess their potential to enhance disease suppression of soil. After the products were amended into two soils, pot experiments were performed to assess soil suppressiveness against the fungal pathogen Rhizoctonia solani and the plant pathogenic nematode Meloidogyne hapla. In addition, several soil characteristics were analyzed, as well as the bacterial and fungal community composition and how microorganisms interact within these communities, to better understand the effect of the organic amendments on creating disease suppressive soils.
Date made available19 Aug 2020
PublisherWageningen University & Research


  • Multispecies

Accession numbers

  • PRJNA657959

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