Earth Science Unit StudyWeek 15: We measured the drainage rates for different types of soil.
Grasslands are found all over the Earth, but are known by several different names. The Savannah in Africa, the Stepps of Asia and the Grasslands of North America are all similar habitats.
After watching the video, we separated soil into coarse, medium and fine grain samples and then measured the water drainage rate of each type as detailed in Janice VanCleave's A+ Projects in Earth Science: Winning Experiments for Science Fairs and Extra Credit.
One factor which influences the success of growing food is the drainage of the soil. Soil that doesn't drain well is wet and can become very muddy. Conversely, soil that drains too quickly may not hold sufficient moisture required by the plants.
* Note that the first time the drainage rate was measured the experiment did not work properly as the flower pot container used (as shown in the picture) had large holes in the bottom. The water and the soil flowed right out.
In addition to calculating the drainage rate of fine, medium and coarse soil, the drainage rate of rocks was also calculated. It was no surprise that rocks drained the quickest, followed by coarse, medium and then fine grain soil. In the future, we plan to repeat the experiment measuring the drainage rate of clay, sand, other types of soil and perhaps oats and lentils.
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