2018年7月28日 星期六

古巴用舊輪呔種植,這辨法可否在戈壁模仿(仿效)?

北方戈壁沙漠風沙吹得勁, 種下的小苗一晚便給埋了.  舊輪呔橫豎沒用, 也多得很, 不妨放在戈壁沙漠作擋風欄柵. 古巴行, 咱們也行.  
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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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 The basic components from which tires are constructed include pigments, chemicals, more than 30 different kinds of rubber, cord fabrics and bead wire. 

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:
Petroleum products account for approximately 22 percent of the materials used in the average tire. This equates to between 5 and 10 gallons of petroleum products, usually crude oil, natural gas or other hydrocarbons.  Source: https://thegrownetwork.com/are-old-tires-or-treated-wood-safe-in-gardening

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A scientist at Plant and Food Research says toxic chemicals can leach out of the rubber.
Brent Clothier, a production scientist at Plant and Food Research, responded:
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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