NaturalFarmer
Well-Known Member
A really interesting presentation from Dr Andrew Margenot. Mostly concerning Pb as it is the most concern due to leaded gasoline which has dusted more urban areas and caused higher amounts of lead levels in soil nationwide. n
Interestingly plant uptake is not as dangerous as direct exposure (83% of exposure is from small grain dust and only 3% from indirect exposure). Wear a mask when mixing amendments and soil. Root crops and low to the ground greens have more heavy metals than fruits. High levels of lead in water didn't seem to effect levels in the crops.
Compost can help decrease availability and stop plants from taking up as much lead ( 40 min mark.)
"Guanos are notoriously high in cadmium."
Interestingly plant uptake is not as dangerous as direct exposure (83% of exposure is from small grain dust and only 3% from indirect exposure). Wear a mask when mixing amendments and soil. Root crops and low to the ground greens have more heavy metals than fruits. High levels of lead in water didn't seem to effect levels in the crops.
Compost can help decrease availability and stop plants from taking up as much lead ( 40 min mark.)
"Guanos are notoriously high in cadmium."
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