This should be done 1-2 weeks before the experiment begins -- the goal is to have a full pot of grass that is at least 1" tall. Ensure that each pot has a FULL amount of grass growing to the edges of the pot.
Methodology -- Label each pot as 1, 2, 3 and 4. Note in lab book that 1 = control (use distilled water if possible, if not, untreated tap water), 2 = .1% solution, 3= 1.0% solution, and 4=5% solution. Prepare at least a quart of each solution by using 1/10th gram of salt per 100ml of water for 2, 1 gram per 100 ml for 3, and 5 grams per 100 ml for 4.
Begin experiment by adding 10 ml (5 onto soil and 5 into reservoir) every fourth day. Ensure that all pots are placed in a warm and sunny area, but not directly in sun. Set up notebook to record the following results for each of the 4 pots (you will have 4 tables):
Day
Color
Height
Ave. Width of growth
Sediment?
Other observations. (ph of soil if possible)
1
Est. predetermined scale
Inches or mm
Inches or mm
Est. predetermined scale
5
9
13
17
21
25
29
Results -- if we were able to use distilled water, we...
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