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For ourexperiment we had 4 different cups with rhi grass seeds in them and we out salt water in one sugar water in another. We also had one with hot water just from the fosset and one with cold water. Over like 2 weeks the sugar and salt water cups did not grow at all. The sugar cup didnt grow at all because the sugar cant dissolve into the soil because it lowers the osmotic potential of the soils water. Soil water normally has a higher osmotic potential than the water inside of the plant, because if this the grass naturally draws water up into its self. If the soil ends up having an overall lower osmotic pressure than the plant the water will not flow from the soil to the plant, killing it because no matter how much you water it the sugar stops the flow. Salt water can also kill plants. The salt draws water away from the plants roots and messis with the plants ability to receive nutrients from the soil and photosynthesize.
"Rhygrass." Wikipedia. Wikimedia foundation, 04 Oct. 2012. Web. 23 Pr. 2012. http://en.Wikipedia.org/wiki/Ryegrass.
Article posted April 17, 2012 at 11:21 AM •
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Wow it is very interesting that the sugar water didn't do anything to the growth of the plant. Good job at explaining about how the sugar lowers the osmotic of the soil. I didn't know that salt water can kill plants and now i know that salt water can draw water away from the plants!
Comment Posted on April 30, 2012 at 01:25 PM by
That sound Fun!
Comment Posted on April 25, 2012 at 01:00 PM by