Roundup persists in the environment
Monsanto used to boast that Roundup is biodegradable, claiming that it breaks down quickly in the soil. But courts in the US and Europe disagreed and found them guilty of false advertising. In fact, Monsanto’s own test data revealed that only 2% of the product broke down after 28 days.
Whether glyphosate degrades in weeks, months, or years varies widely due to factors in the soil, including pH, clay , types of minerals, residues from Roundup Ready crops, and the presence of the specialized enzymes needed to break down the herbicide molecule. In some conditions, glyphosate can grab hold of soil nutrients and remain stable for long periods. One study showed that it took up to 22 years for glyphosate to degrade only half its volume! So much for trusting Monsanto’s product claims.
Glyphosate can attack from above and below. It can drift over from a neighbors farm and wreak havoc. And it can even be released from dying weeds, travel through the soil, and then be taken up by healthy crops.
The amount of glyphosate that can cause damage is tiny. European scientists demonstrated that less than half an ounce per acre inhibits the ability of plants to take up and transport essential micronutrients (see chart).
As a result, more and more farmers are finding that crops planted in years after Roundup is applied suffer from weakened defenses and increased soilborne diseases. The situation is getting worse for many reasons.
1. The glyphosate concentration in the soil builds up season after season with each subsequent application.
2. Glyphosate can also accumulate for 6-8 years inside perennial plants like alfalfa, which get sprayed over and over.
3. Glyphosate residues in the soil that become bound and immobilized can be reactivated by the application of phosphate fertilizers or through other methods. Potato growers in the West and Midwest, for example, have experienced severe losses from glyphosate that has been reactivated.
4. Glyphosate can find its way onto farmland accidentally, through drifting spray, in contaminated water, and even through chicken manure!
Imagine the shock of farmers who spread chicken manure in their fields to add nutrients, but instead found that the glyphosate in the manure tied up nutrients in the soil, promoted plant disease, and killed off weeds or crops. Test results of the manure showed glyphosate/AMPA concentrations at a whopping 0.36-0.75 parts per million (ppm). The normal herbicidal rate of glyphosate is about 0.5 ppm/acre.
Manure from other animals may also be spreading the herbicide, since US livestock consume copious amounts of glyphosate—which accumulates in corn kernels and soybeans. If it isn’t found in livestock manure (or urine), that may be even worse. If glyphosate is not exiting the animal, it must be accumulating with every meal, ending up in our meat and possibly milk.
Add this threat to the already high glyphosate residues inside our own diets due to corn and soybeans, and we have yet another serious problem threatening our health. Glyphosate has been linked to sterility, hormone disruption, abnormal and lower sperm counts, miscarriages, placental cell death, birth defects, and cancer, to name a few. (See resource list on glyphosate health effects.)