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<p>In this study we integrated data from six different studies to assess which management practices are associated with a higher general suppressiveness against <i>Globisporangium ultimum</i>. Notably, all investigated practices were carried out directly in fields in the Netherlands, thereby representing conditions as present in practice. Field soil was subsequently used to measure suppressiveness with a shared bioassay where disease incidence was measured in garden cress (<i>Lepidium sativum</i>) after <i>G. ultimum</i> inoculation. We found an increase in suppressiveness with anaerobic soil disinfestation treatments in the compiled dataset, while this was not always the case in the individual datasets. Reduced tillage had a limited positive effect on suppressiveness in a single study. Organic amendments as a treatment alone, did not increase suppressiveness and a study with multiple fields demonstrated a decrease in suppressiveness when employing disinfestation by inundation. Moreover, soil type had a significant effect on <i>G. ultimum</i> suppressiveness, as suppressiveness was higher in clay soils compared to sandy soils. Both clay soils and soils that had undergone anaerobic soil disinfestation harboured a higher microbial biomass. Suppressiveness was specifically correlated with bacterial abundance, supporting the theory that general suppressiveness is a product of competition with an active soil microbiome. In addition, suppressiveness was found to be correlated with some chemical soil parameters, namely pH, Ca and S. In conclusion, this study indicates which management practices can be employed for and which soil properties are associated with general suppressiveness against <i>G. ultimum.</i></p>

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Integration of six field studies to assess soil suppressiveness against Globisporangium ultimum under different management practices

  • 期刊论文

  • 发表日期：

    2025年12月6日

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  • Viola Kurm,
  • Mirjam T. Schilder,
  • Johnny H. M. Visser,
  • Joeke Postma

摘要

In this study we integrated data from six different studies to assess which management practices are associated with a higher general suppressiveness against Globisporangium ultimum. Notably, all investigated practices were carried out directly in fields in the Netherlands, thereby representing conditions as present in practice. Field soil was subsequently used to measure suppressiveness with a shared bioassay where disease incidence was measured in garden cress (Lepidium sativum) after G. ultimum inoculation. We found an increase in suppressiveness with anaerobic soil disinfestation treatments in the compiled dataset, while this was not always the case in the individual datasets. Reduced tillage had a limited positive effect on suppressiveness in a single study. Organic amendments as a treatment alone, did not increase suppressiveness and a study with multiple fields demonstrated a decrease in suppressiveness when employing disinfestation by inundation. Moreover, soil type had a significant effect on G. ultimum suppressiveness, as suppressiveness was higher in clay soils compared to sandy soils. Both clay soils and soils that had undergone anaerobic soil disinfestation harboured a higher microbial biomass. Suppressiveness was specifically correlated with bacterial abundance, supporting the theory that general suppressiveness is a product of competition with an active soil microbiome. In addition, suppressiveness was found to be correlated with some chemical soil parameters, namely pH, Ca and S. In conclusion, this study indicates which management practices can be employed for and which soil properties are associated with general suppressiveness against G. ultimum.