Science experiment on soil erosion – This experiment, which has a tremendous visual impact due to its simplicity, it will demonstrate the relationship between precipitation, soil erosion, protection of watercourses and vegetation.
A very simple experiment that stresses the importance of the vegetation cover of the soil.
You can propose in three versions:
– Preparing the planting of seedlings
– Using plants ready to be transplanted
– Using soil samples.
Science experiment on soil erosion – First version
Prepare three identical plastic bottles, cut as shown in the pictures and put them on a flat surface (I’ve stuck with the hot glue on a tablet of plywood):
the opening of the three bottles should protrude a little out of the surface. Put in each bottle the same amount of ground and press hard to pack as much as possible. The ground must be below the level of the opening of the bottle:
Cut the bottom of other three bottles of transparent plastic, and make two holes for the string. These cups will serve to collect, during the experiment, the water in excess, which reproduces the rainwater:
Then put the cap on the first bottle in which to plant the seeds:
put inside the second bottle some dead vegetal wastes (twigs, bark, leaves, dead roots).
In the third bottle just leave ground.
Spread the seeds in the first bottle (I chose watercress, basil and chives), cover with a layer of ground and press a little, then watering.
You can use the piece of plastic cut from the bottle to cover the soil seed like a greenhouse, which will help the seeds to germinate faster:
Expose to sunlight, and take care of planting until the plants are well developed. The actual experiment can be done only then …
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