Thouvenel wrote:
On the possible residues due to horticultural greenhouses prior to my garden? A need for analysis? Which ones?
I hesitate, prices seem high.
In the "horticultural" residues, there is potentially:
a) fertilizers - sometimes with heavy metals (some fertilizers are rich; but there are limit values): anyway, nothing to do; anyway, it remains in "bearable" values (at worst!)
(b) pesticide residues; in general, they are organic molecules, which decompose slowly but decompose; kidney to do with copper sulphate, which remains!
Precise analyzes would require "cutting-edge" research for all possible products (we only find what we are looking for!): It would be overpriced!
So it's better to console yourself:
a) theoretically, we remain within limit values; vegetables grown under these conditions are those found in stores; including possibly under the label "organic" (in vegetables, after a year of conversion, a product is labeled; the earth is supposed to have recovered).
(b) most of the
potential pollutants, nature slowly regains its rights; and the more your soil will be alive, the more these residues will be dismantled ... or "deactivated" or "captured" in complex organic molecules, which make them less operative ...
I think it is worth places not to be more rigorous than the Ayatollahs and Khmer Verde combined: the bulk of the pesticides that we "consume" without the knowledge of our own free will are the residues of the treatments directly supported by the crops. Even if in some very specific situations, we can have soil pollution: old industrial sites, landfills, along roads (with lead residues released for 30 years by cars; lead, like copper, does not "migrate "not and is therefore still there).