Yes, that's how I read it. They also said: "glyphosate inhibited the growth of 59% of selected naturally occurring soil microbes", not "59% of beneficial soil organisms", which puts a subtly different slant on it again.
Have you read this paper? It's available here as a pdf. It's actually a literature review rather than original research, and the papers they refer to mainly test pure cultures of microorganisms in laboratory conditions. They write:
"Cooper et al. (1978) found that 50 ppm inhibited growth of 59% of randomly selected soil bacterial, fungal, actinomycete, and yeast isolates";
earlier, they state:
"Recommended field application rates from 0.34 to 1.12 kg active ingredient (AI) ha- 1 for control of annual weeds, and 1.12 to 4.48 kg AI ha- 1 for perennials, applied in 187 to 561 L water ha- 1 (WSSA, 1983). According to Brown (1978), 1 kg ha 1 of a pesticide will give a concentration in the top 13 cm of a field of roughly 0.45 ppm.
Thus, the highest application rate should give rise to a soil concentration of roughly 2 microg g- 1.[ie 2 ppm]"
In other words, they're telling us that growth of 59% of these organisms were inhibited in laboratory conditions when exposed to glyphosate in a concentration 25 times stronger than that expected under normal field application rates.
In section 7. Effect on Soil Microbial Activity and Populations, Carlisle and Trevors cover other literature on the effects of glyphosate on microbial activity in the soil. With high applications of glyphosate, some studies showed inhibition of microbial activity; others found no such inhibition. In another work, the authors themselves found that anaerobic nitrogen
fixation was inhibited by high (ie. 630 ppm) concentrations of glyphosate. The final sentence of this section reads:
"However, no toxicity to any of these microbial processes should be observed at recommended field application rates of the herbicide." Curiously, this is interpreted in the abc link as "Toxic to soil microbes including nitrogen-fixing bacteria, mycorrhizae, actinomycete, and yeast isolates". In fact, in my reading of that paper, Carlisle and Trevors seem quite favourable towards glyphosate.
I can't find the entire paper, only the abstract, but Levesque et al, in trial plots infested with various weeds, did find increases in the size of Fusarium spp colonies in some species of weeds, but not in others. The final sentences of the abstract read:"At both sites, the number of colony-forming units of Fusarium spp. per gram of dried soil was increased by the application of glyphosate. Nevertheless, crops subsequently sown in the field containing the annual weeds were not detrimentally affected by glyphosate treatment of these weeds." Nowhere in the abstract are Columbian subsistence farmers mentioned.
I could go on, but a lot of the other papers cited are only available by subscription.
I agree with those who think we should be sceptical of official guidelines etc, rather than blindly following them - scepticism, to a point, is healthy - but I believe that major parts of this "evidence" published on the abc website lack credibility, because whoever wrote it seems to have mis-interpreted and selectively quoted some of the literature to try and support their opinion ( isn't that the sort of think that these big agri-businesses are always being accused of?). Why be sceptical of official guidelines, recommendations, etc, yet then accept without question summaries of research we have never read, written by people we don't know and published on a website we had never heard of until a few days ago?
To put it into context, which do you think is more toxic: glyphosate or salt?