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Listen to part of a talk in a botany class.
OK. So we've talked about some different types of root systems of plants, and I've shown you some pretty cool slides,
but now I want to talk about the extent of the root system―the overall size of the root system...the depth.
I want to tell you about one particular experiment. I think you're going to find this pretty amazing.
OK. So there was this scientist...this very meticulous scientist decided that the best place to see a whole root system―
to actually see how big the entire system got―the best place would be to grow it...where?
Um, water?
In water. So he took rye plants―it was rye plants―and he started growing them in water.
Now, you've all heard of growing stuff in water before, right?
It's done commercially, right? Uh, like to grow vegetables and flowers?
Right. They grow all kinds of commercial crops in water.
So, if you're growing things in water, you can add the fertilizer.
What do you need to do to that water besides put fertilizer in it? Anyone ever actually tried to grow plants in water?
You must bubble water through it. Bubble gas through it. I'm sorry, you must bubble gas through it.
So, gas, you have to bubble through. Think about the soil we talked about last week, about growing plants in soil.
Think about some of you who have killed your favorite houseplants, 'cause you loved them too much.
If you overwater, why do your favorite houseplants die?
Oh, no oxygen.
Not enough oxygen for the roots...which do what twenty-four hours a day in all seasons?
请听一段植物学课上的演讲。
我们已经讲过一些不同种类的植物的根系,我给你们看了一些很酷的幻灯片,
但我现在想说一下根系的长度――根系的总尺寸,深度。
我要跟你们讲一个特别的实验。我想你们会觉得很惊奇。
好了。曾经有一个科学家,这个非常谨慎的科学家认为,最适合观察一整个根系的地方――
真正地观察整个系统能长到多大――,最好把它种在......哪里?
水里吗?
在水中。他取了黑麦植株――是黑麦――然后开始在水里种植。
你们以前都听过在水里中东西,对吧?
是商业种植,对吗?比如种植蔬菜和鲜花?
对的。他们在水里种植各种商业作物。
所以,如果你要在水里种东西,你可以加入肥料。
除了在水里加入肥料还要对水做些什么?有人试过在水里种植物吗?
你得往里面充入水。充入气体。说错了,是充入气体。
所以你得往里面充气。想一想我们上周说过的土壤,在土壤中种植植物。
想一想你们谁杀死了自己最爱的室内植物,因为溺爱。
如果你浇水过多,你最爱的室内植物就会死,为什么?
哦,缺氧。
根部没有足够的氧气,一年四季每天都在做的是什么?
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