[USCC] cadmium in finished compost

[frank]

Mark,
The average Cd concentration in compost is 2.36 ug/g from the >3000 
samples tested.
Dated info from a 1983 study in our area reports if the soil pH <6.5 the 
Cd concentration should be less than 2.5 in the soil.
The Santa Cruze County, CA. has a location where natural soils has high 
cd in the range of 2 to 6.5 ug/g Cd and is where the study was from.
 From the limited number of samples in this study I suggest growing 
lettuce, chard, and spinach  may be a problem on soils with a low pH and 
high Cd accumulation.

I'm sure there are much better and more recent studies to look at.

Frank


MMAKRING at aol.com wrote:

>Participate in the Annual Compost Awareness Week May 6, 2007 to May 12, 2007
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>How does the level 8.2 mg/kg Cadmium effect the end uses for a finished and 
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>Does the pH of the soil have any bearing on what type crops can and cannot be 
>grown after application of the compost? What would be applicable application 
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>Mark Ringenberg
>Ringenberg Nursery
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-- 
Frank Shields
Soil Control Lab
42 Hangar way
Watsonville, CA  95076
(831) 724-5422 tel
(831) 724-3188 fax
frank at compostlab.com
www.compostlab.com