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古巴圖文資料來源: http://www.rthk.hk/tv/dtt31/programme/exploringtheedibleplanet2/episode/513195 (有片)
古巴頻密下雨, 用大輪呔墊高來預防洪水沖走農作物.
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Manufacturing Process:
The process of building tires begins with the mixing of basic rubbers with process oils, carbon black, pigments, antioxidants, accelerators and other additives. Tires are formed on machines and heated at over 300 degrees Fahrenheit for 12 to 25 minutes.
Petroleum Products Used:
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I wouldn't recommend growing food in unlined car tyres.
They are typically made of (relative weights) natural rubber (100); zinc oxide (3) and stearic acid (5) as activators; carbon black (50) as reinforcer; process oil (5) as self-adhesion; antioxidant (1); accelerator (0.5); and sulphur (2.5) as vulcanising agent.
Also during their original use they pick up, on the outside, hydrocarbons from the road surface and emissions from cars. Lining would be prudent, if not essential.
The U.S. Environmental Protection Agency has no worries about tyres being used for containing vegetable gardens, but tyre mulch or ash is a definite no-no as the zinc is more readily leached out and can make the soil toxic.
One study of the soil under a 10-year-old tyre dump in the UK showed elevated soil cadmium, lead and zinc concentrations, and these decrease exponentially with distance away from the pile.
Where large numbers of tyres have been burnt, nothing grows.
We have raised gardens at home made out of treated timber, and I made plastic linings to separate the wood from the soil inside.
In most treated timber it's the CCA (copper, chromium & arsenic) that leaches out. Arsenic is the most mobile.
A 2011 study (Environ Health Perspective, 2011 Jul 1; 119(7): 989–996) showed that of standard new plastic items a large percentage leached traces of chemicals having detectable estrogen activity. A few parts per billion may be detrimental to young mammals.
Send questions to Ask-A-Scientist, email questions@ask-a-scientist.net Source: https://www.stuff.co.nz/science/76438466/ask-a-scientist-can-i-grow-vegetables-in-old-tyres
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Source: 科威特的沙塵暴 www.rthk.hk/tv/dtt31/programme/sciencewithyou/episode/513365
http://blog.sina.com.cn/s/blog_b96391280102y8ve.html
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