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Old March 19, 2012   #14
amideutch
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I did a google on the following topic concerning RoundUp (Glyphosate)

"Effects of glyphosate on rhizosphere soil microbial communities"

Here are some excerpts from different articles. Ami

Reports show that glyphosate imposes diverse effects on
the biology and ecology of rhizosphere microorganisms and on
their interactions with plant roots when released into the rhizosphere.
Although the interactions suggest a “secondary mode
of action” of glyphosate by pre-disposing susceptible plants to
microbial infection (Johal and Rahe, 1984), the potential for developing
critical pathogen inocula levels in soils that affect crop
health, altering rhizosphere microbial communities involved in
nutrient transformations, and shifting the balance of beneficial
and detrimental plant-associated microorganisms are legitimate
concerns regarding the impact of glyphosate on crop productivity
and environmental sustainability. This is especially significant
with consideration to the current widespread use of glyphosate in
glyphosate-resistant (GR) cropping systems.

Glyphosate reduces nitrogen fixation by several mechanisms. Nitrogen-fixing bacteria such as the soybean symbiont, Bradyrhizobioum japonicum, possess a glypohsate-sensitive EPSPS, and hence fail to grow when exposed to glyphosate.

Some 40 diseases are known to be increased in weed control programmes with glyphosate and the list is growing [1, 12], affecting a wide range of species: apples, bananas, barley, bean, canola, citrus, cotton, grape, melon, soybean, sugar beet, sugarcane, tomato and wheat.

Diseases caused by the fungus Fusarium have increased with the extensive use of glyphosate [12]. For example, glyphosate use predisposes tomatoes to Fusarium crown and root rot.

Research published in 1979 already showed that glyphosate absorbed through plant foliage after application was transported systemically toward the roots and eventually released into the rhizopshere [15] where it changes the whole ecology of the soil, resulting in increased colonisation of plant roots by pathogenic species such as Fusarium and Phytophorthora, as well as Pythium in bean plants.
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