Newsgroup: it.discussioni.agricoltura
Titolo: Verderame

..rame metallo, a dirla come è scritto sulla scatola.
Abbiamo sempre utilizzato quello sui nostri pomodori dell'orto. E' tossico
oppure no?
Benny

 oppure no?
è un metallo pesante, non so dirti se cancerogeno ma sicuramente mutageno,
ha una azione negativa sul terreno riducendo l'attività dei batteri e altera
l'equilibrio tra funghi e alghe, uccide lombrichi, pesci, lumache...insomma
bene non fa
in agricoltura bio per la vite è ammesso un rapporto di Cu di 4,6 kg. per Ha
all'anno,
ma per i pomodori lo usi per la peronospora, immagino che altrimenti ti
farebbe dei danni enormi
ciao mauri
saluti da 
www.ziopapes.it
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ciò che s'usa non fa scusa

 all'anno,
Per ora, ma presto verra' portato a 3 kg./ha
La carenza e' di venti giorni, come per tanti altri
prodotti.
Io credo che non sia sufficiente lavare i prodotti trattati
per consumarli prima del termine del periodo di carenza, ma
qualcuno pensa il contrario....
--
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Stefano.
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IL SANTO
Rimuovi CAZZAROLA per il reply.

:o)
Il solfato di rame ha una bassissima tossicità (DL 50300mg/kg) e comunque
puoi leggerti da solo con comodo la scheda MSDS all'indirizzo seguente:
http://ace.orst.edu/cgi-bin/mfs/01/pips/coppersu.htm?82#mfs
E comunque ti riporto alcune frasi per semplicità:
"... The lowest dose of copper sulfate that has been toxic when ingested by
humans is 11 mg/kg [22]. Ingestion of copper sulfate is often not toxic
because vomiting is automatically triggered by its irritating effect on the
gastrointestinal tract. Symptoms are severe, however, if copper sulfate is
retained in the stomach, as in the unconscious victim. Some of the signs of
poisoning which occurred after 1 to 12 g of copper sulfate was swallowed
include  ..."
"...  Copper sulfate can be corrosive to the skin and eyes [8]. It is
readily absorbed through the skin and can produce a burning pain, as well
as the other symptoms of poisoning resulting from ingestion. Skin contact
may result in itching or eczema [8]. It is a skin sensitizer and can cause
allergic reactions in some individuals [24]. Eye contact with this material
can cause conjunctivitis, inflammation of the eyelid lining, cornea tissue
deterioration, and clouding of the cornea [23] ..."
"... Vineyard sprayers experienced liver disease after 3 to 15 years of
exposure to copper sulfate solution in Bordeaux mixture [8]. Long term
effects are more likely in individuals with Wilson's disease, a condition
which causes excessive absorption and storage of copper [25]. Chronic
exposure to low levels of copper can lead to anemia [8]. The growth of rats
was retarded when given dietary doses of 25 mg/kg/day of copper sulfate.
Dietary doses of 200 mg/kg/day caused starvation and death ..."
"... Carcinogenic effects: Copper sulfate at 10 mg/kg/day caused endocrine
tumors in chickens given the material parenterally, that is, outside of the
gastrointestinal tract through an intravenous or intramuscular injection
[22]. However, the relevance of these results to mammals, including humans,
is not known ..."
"... Copper sulfate is practically nontoxic to birds. ..."
"... Breakdown in soil and groundwater: Since copper is an element it will
persist indefinitely. Copper is bound, or adsorbed, to organic materials,
and to clay and mineral surfaces. The degree of adsorption to soils depends
on the acidity or alkalinity of the soil [8]. Because copper sulfate is
highly water soluble, it is considered one of the more mobile metals in
soils. However, because of it binding capacity, its leaching potential is
low in all but sandy soils [8]. When applied with irrigation water, copper
sulfate does not accumulate in the surrounding soils. Some (60%) is
deposited in the sediments at the bottom of the irrigation ditch, where it
becomes adsorbed to clay, mineral, and organic particles. Copper compounds
also settle out of solution [26]. 
Breakdown in water: As an element, copper can persist indefinitely.
However, it will bind to water particulates and sediment. 
Breakdown in vegetation: One of the limiting factors in the use of copper
compounds is their serious potential for phytotoxicity [24]. Copper sulfate
can kill plants by disrupting photosynthesis. Blue-green algae in some
copper sulfate treated Minnesota lakes became increasingly resistant to the
algacide after 26 years of use  ..."
Direi che ne hai abbastanza....
;o)))
Max
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landi...@jumpy.it
Tutto quanto scrivo è frutto delle mie esperienze personali, 
ragionamenti ed e' assolutamente IMHO.
"...l'importante, nella vita, è avere il laringoscopio dalla 
parte del manico..." Stemaz - I.S.P.
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