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[讨论]Organic food and biosolids
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2005-09-28 09:37:00
I started a new topic because this sounds important. I'm not an expert and would like to know the exact answer from anyone who know this more.
施有biosolids的土壤生产的粮食, 蔬菜, 吃了这种土壤种植的饲料的鸡是不是也被称为organic呢? If so, shall we go for, or avoid organic foods?
Here is the link to "biosolids", http://ehp.niehs.nih.gov/qa/105-1focus/focusbeauty.html , if you haven't heard of this word. It's just another name for processed "sewage sludge".
Here is a link from U.S. Environmental Protection Agency: http://www.epa.gov/owm/mtb/biosolids/useofmid/ If you just google "biosolids" or search from EPA website, you'll find lots of debate about the bad effect of biosolids application.
And, land with biosolids can be used to produce crops and vegetables that might be consumed by human beings. The following paragraphs are from this link http://www.ext.vt.edu/pubs/compost/452-303/452-303.html
"Agricultural Land Application of Biosolids in Virginia: Managing Biosolids for Agricultural Use
High N-use crops such as corn, soybean, small grains, and forages will minimize the amount of land needed for biosolid application and will benefit from the N supplying capability of bisolids. Crops grown for their flowering parts, such as cotton, can produce undesirable amounts of vegetative growth if they continue to accumulate N late in the season. Thus, slow release N sources such as biosolids and manures may impair the quality of such crops; however, biosolids can be used efficiently on other crops in rotation with cotton.
Biosolids can be applied to vegetable crops, but green leafy vegetables tend to accumulate higher concentrations of metals than the grain of agronomic crops. Some scientists have cautioned against using biosolids on vegetable crops because they provide a direct conduit of potentially harmful trace elements from the soil to humans. Therefore, grain and forage crops are better choices for biosolids application than vegetables. Tobacco accumulates heavy metals such as Cd in high concentrations, and the use of biosolids on tobacco land is not recommended. "
bang ni ti yi jiao
According to USDA, organic food is produced by farmers who emphasize the use of renewable resources and the conservation of soil and water to enhance environmental quality for future generations. Organic meat, poultry, eggs, and dairy products come from animals that are given no antibiotics or growth hormones. Organic food is produced without using most conventional pesticides; fertilizers made with synthetic ingredients or sewage sludge; bioengineering; or ionizing radiation. Before a product can be labeled "organic," a Government-approved certifier inspects the farm where the food is grown to make sure the farmer is following all the rules necessary to meet USDA organic standards. Companies that handle or process organic food before it gets to your local supermarket or restaurant must be certified, too.
You must look at package labels and watch for signs in the supermarket. Along with the national organic standards, USDA developed strict labeling rules to help consumers know the exact organic content of the food they buy. The USDA Organic seal also tells you that a product is at least 95 percent organic.
[此贴子已经被作者于2005-9-28 9:56:32编辑过]
看了,觉得任何topic都会有debate，就比如鸡蛋到底要不要吃一样。。但有一点no doubt,organic的食品是有严格的检验标准的，比conventional的来说。。那个biosolids，俺不懂。不过conventional的食品土壤里面也有那个biosolids呢？如果有，还是选organic啊，毕竟没有加催生剂啊，检验的标准也更严阿。。100%的organic是不可能的。俺觉得化学成分加得越少得越好吧，如果是相对的说。。
到底了
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