Are We Shooting Ourselves In The Foot With A Silver Bullet?

Glyphosate has changed the face of crop production, but some researchers are concerned about potentially serious problems

No-tillers should not be too quick to blame weather and the other usual culprits for struggling, diseased crops.

Don Huber, retired plant pathologist from Purdue University, says untreated micronutrient deficiencies may be to blame. Micronutrients are essential for small grains, soybeans, corn and other crops to tolerate stress, fight disease and produce to their potential.

Huber says the effects of micronutrient deficiencies are showing up more regularly, but it’s what’s he says is possibly causing those deficiencies that many no-tillers may find surprising — glyphosate.

“Glyphosate works by chelating — or tying up — micronutrients necessary for plant function. It even reduces micronutrient efficiency in glyphosate-tolerant crops,” he says. “Just having the gene present reduces efficiency up to 50% for zinc and manganese.

“Add the chemical to that and you get an additive effect on plant physiology, including decreased efficiency, stress and disease resistance.”

Most unexpected is that glyphosate is exuded by roots of weeds and glyphosate-resistant crops and lingers in the soil where it can impact crops in following years.

“Glyphosate is not bio-metabolized by the plant. It isn’t biologically degradable and it accumulates in the soil and in perennial plants,” Huber says. “It immobilizes rapidly because it’s a strong chelator, but it’s not removed from the system.”

Huber says glyphosate can create micronutrient deficiencies in three ways:

1. It reduces micronutrient utilization in glyphosate-tolerant crops due to a combination of the gene and the added effect of the chemical.

2. It lingers in the soil and in perennial…

To view the content, please subscribe or login.
 Premium content is for our Digital-only and Premium subscribers. A Print-only subscription doesn't qualify. Please purchase/upgrade a subscription with the Digital product to get access to all No-Till Farmer content and archives online. Learn more about the different versions and what is included.

Top Articles

Current Issue


No-Till Farmer

Get full access NOW to the most comprehensive, powerful and easy-to-use online resource for no-tillage practices. Just one good idea will pay for your subscription hundreds of times over.

Subscribe Now

View More

Must Read Free Eguides

Download these helpful knowledge building tools

View More
Top Directory Listings