What characterizes suppressive soils?

Suppressive soils are characterized primarily by the presence of beneficial microorganisms that are antagonistic to pathogens. These microorganisms play a crucial role in preventing or reducing the incidence of plant diseases by outcompeting harmful pathogens for resources, producing metabolites that inhibit pathogen growth, or directly attacking pathogenic organisms.

In the context of soil health and disease management, suppressive soils can significantly enhance plant resilience. The interactions between plants and these beneficial microorganisms can lead to improved plant growth and yield, even in the presence of potential pathogens. The concept of biological suppression is fundamental in organic agriculture and integrated pest management practices where fostering these beneficial microbial communities is a key strategy for managing plant diseases.

While high moisture content, low pH levels, and high nutrient availability can influence soil characteristics and plant health, they do not inherently define suppressive soils. These conditions can vary widely and do not guarantee the presence or effectiveness of the beneficial microorganisms that provide suppression against pathogens.