This science fair project was conducted to examine the relationship between the pH level of soil and plant growth. Specifically, what is the ideal pH level at which Kentucky bluegrass grows? Kentucky bluegrass was grown in soils that had different pH levels (6.0, 6.5, 7.0, 7.5 and 8.0).
1. For this experiment, the independent variable is the pH level of the soil (6.0, 6.5, 7.0, 7.5 or 8.0). The dependent variable is the height of the Kentucky bluegrass. Measure the average height of the grass in each of the 5 pots. The constants (control variables) are the conditions in which the pots are kept (they should be in a place that has the same temperature, humidity and light), the type of grass used, the size of the pots, and the type of soil used. 2. Pour an equal amount of soil into 5 pots. Using a soil chart, .....
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