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OBSERVE ROOT GROWTH RELATIVE TO WATER A. Let's find out what the relationship is between roots and water. We'll use a shallow box half-full of potting soil and two clay plant pots with their holes plugged with oil- based clay. The pots are set in the corners of the boxes, catty-corner from each other. It is important to use clay pots because they are porous. What does porous mean? You can plant some seeds in the soil in the box--be sure to get seeds planted evenly across the box, using all the soil-space. Radishes or alfalfa are good for this experiment, because they grow so fast. The potting soil is dry. We're going to fill one plant pot with water, and the other pot will be empty. We will not water the soil at all. Let's watch the pot with water, and if it gets empty, it has to be filled again. After several days, we will see some green peeking up above the soil. Where will the green be? Which seeds will germinate first, and where will we see the plant start growing? Do you think seeds germinate best near the water, or far from it? How do we know if they do better near the water? How do the roots get water? We haven't put any water on top of the soil or directly onto the little stems. Do the roots use the water, and send it to the stems? How do the roots get it? After two weeks or so, we're going to take out the pots and see what it looks like in the soil next to the pots. Willthere be a bunch of roots by the water pot and none by the dry pot? What does that tell us? Let's take out some of the plants that are farthest from the water pot, and see how their roots grew. Do you think they would grow toward the water pot? B. We could put one pot into the center of a box of potting soil, then plant seeds throughout the soil, and fill the pot with water. We could see where the plants grow first and best. C. If we want, we can soak some seeds overnight, then plant them in potting soil right next to the side of an aquarium. Into one corner of the aquarium, we would put a clay pot, with the hole plugged, and keep it filled with water. We could watch the soil to see how far from the pot the water is absorbed, and watch the root growth after the seeds germinate.  Any problems with this page? Send URL to
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