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发表于 2009-10-29 13:06
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26# 爱城一粒沙子 ' s( c3 p' ]$ h2 B0 I7 u1 W; e
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你说得很有道理。- t' q( P4 d' e7 s3 `
我就这个问题询问了一位compost方面的专业人士,他是本地人,有很多年家庭compost的经验,目前也从事这方面的工作。下面是我们的问答:
3 W) Z; @$ j; I0 m: n' x5 XThe attached is a picture I took at the Eco House during the garden tour. Is the funtion of news paper here mulch to remove weed seeds in soil?
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Yes, it appears the gardener is trying to smother a perennial root system like Quack Grass or Canada Thistle. The root system will try to get through the thick paper layer and exhaust itself. In the case of Quack Grass, the roots will grow up into the layers of paper making them slightly easier to remove (they are tough!) and kill.
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If that, will the printing chemicals in newspaper leach (or transfer) into soil?
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& X' s$ [1 g- E$ B# qOnce a chemical is created it will be around for quite a while, so yes, the chemical inks will transfer into the soil.
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# k8 f$ d2 X( [& r3 w& nI remember that newspaper can be used in compost.
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1 b) Y& D+ ]+ X; q$ Y! [; L" X( iIt is a useful Brown for many applications..
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Do you think that compost can be used in vegetable garden?
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Yes, the chemical based inks are non-toxic and in minute amounts - you would absorb more of these chemicals by simply handling the paper than by composting it. This is a very very small concern in the grand scheme of things - taking the time to use newspaper in the way shown in the photograph is good exercise and will ultimately be better for your health than not doing it. : k {; e! U; v( h
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根据上面的回答,我认为可以发现这样一个事实,报纸做mulch时并不会腐烂。你看, the roots will grow up into the layers of paper making them slightly easier to remove,报纸不仅是完整的,还具有一定的韧度,可以帮助把根拔出来。3 Q! c' y2 Z4 o" l# @- p
不容置疑的是,尽管报纸没有腐烂,报纸中的有害健康物质一定会有一部分渗透出来。就看你愿意不愿意接受这一点污染物。就像是明知道蔬菜在家放上三五天,里面的亚硝酸盐含量在不断增加,可是还是要一买就买一周的菜,因为平时没有时间。报纸mulch提供了一种便捷的方式除草,对园艺者来说不失为一个可选项。 |
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