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Treated Pine For Vegie Gardens
This article on treated pine appeared in the February 2009 issue of ‘Burke’s Backyard’ magazine. The bottom line is this: relax! Treated pine is safe to use in gardens, but if you are worried about the old-style arsenic-treated pine, the new stuff – ACQ treated pine – is arsenic-free and becoming easier to find.
Lots of people worry about the safety of treated pine sleepers for vegie garden beds, but new products and sound research should ease organic gardeners’ fears.
One of the most popular ways to edge raised vegie garden beds is to use timber sleepers of some sort. And that’s where people start to worry. They know that the famous poison arsenic is part of the treatment used to preserve the most common sort of treated pine – CCA treated pine (which stands for ‘Copper Chrome Arsenate’). The understandable fear is that the arsenic will leach into the soil and enter the plants. Considering that almost all backyard vegie growers these days are growing their own food organically, with the emphasis on chemical-free, healthy plants, the idea of poison lurking in their organic-rich soil is definitely not on. No way, Jose!
Arsenic fears
The evidence against CCA treated pine isn’t strong, but the simple fact is that lots of people don’t trust it, won’t trust it and won’t use it because it has arsenic in it. And for them there is good news. There’s a new form of treated pine around called ACQ which is free of arsenic and chromium and offers real peace of mind, so see our box story on ACQ treated pine for more details on this.
But back to the CCA treated pine, as this is far easier to obtain than ACQ treated pine at the moment. First of all, why do they use copper, chrome and arsenic to treat timber? Well, the copper controls fungi and marine borers, the arsenic controls termites and other insects, and the chromium fixes these two chemicals in the timber.
There is little evidence that the arsenic in treated pine leaches into soils. Where the real concerns lay is when CCA treated pine is used in playground equipment, where toddlers, who will put virtually anything in their mouth, run the risk of chewing on a scrap of timber or soil which lies next to treated timber. Another real concern with CCA is when woodworkers cut it. Breathing in the sawdust from treated pine is a health hazard, and you should always wear a dust mask when cutting it, and keep spectators away. CCA treated pine should also never be burned, nor should it ever come in contact with drinking water.
So, with all those warnings, it’s no wonder that people shy away from CCA treated pine. But, as we have said earlier, there is little credible scientific evidence that when used as an edging material for garden beds, that it leaches arsenic into the soil.
http://www.burkesbackyard.com.au ... -for-vegie-gardens/ |
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我要一杯咖啡 (2008-5-12) patrickzhu 
楼主:s3030629
发表于 2015-6-20 15:31
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