For those who are yet undecided,
Evidence continues to accumulate regarding the pronounced negative effect of glyphosate on soil health, and how it leads to disease enhancing soils.
A new paper recently published describes how using glyphosate to terminate an oats cover crop alters the soil microbial profile as compared to a cover crop that is mowed1.
The conclusion? Glyphosate alters the microbial community dynamics, some species become more dominant, while others are suppressed. Not a surprise. We know from prior work by Huber et. al. that glyphosate applications shift the microbial population in the direction of a disease enhancing environment.
A second recent publication describes how minerals are lost from cover crops sprayed with glyphosate and don’t seem to remain plant available in the soil profile.2
If you want to develop disease suppressive soil that prevents possible infections of soil-borne bacteria or fungi, there doesn’t seem to be a place for glyphosate in the toolbox.
1. Allegrini, M., Gomez, E. D. V., Smalla, K. & Zabaloy, M. C. Suppression treatment differentially influences the microbial community and the occurrence of broad host range plasmids in the rhizosphere of the model cover crop Avena sativa L. PLoS One 14, e0223600 (2019)..