SOIL AND WATER
GRAPHS
Table 1
LIGHT ON
TIME
SOIL (°C)
WATER (°C)
0 minutes
21
20
1 minute
21
20
2 minutes
22.5
20
3 minutes
23
20.5
4 minutes
23
20.8
5 minutes
24.5
21
6 minutes
24.8
21
7 minutes
25
21
8 minutes
25
21.5
9 minutes
25.5
21.7
10 minutes
25.5
22
Table 2
LIGHT OFF
TIME
SOIL (°C)
WATER (°C)
0 minutes
25.5
22
1 minute
25.5
22
2 minutes
25
22
3 minutes
25
22
4 minutes
24.7
21.8
5 minutes
24.3
21.5
6 minutes
24
21.3
7 minutes
23
21.2
8 minutes
22.75
21
9 minutes
22.5
21
10 minutes
22
21
Remember Graphing Rules
 Line graphs show change over time. The dots represent
the measurement for the time period and the line
represents the change.
 Units should be evenly spaced and spread out as far as
possible along both the x-axis and/or the y-axis.
 As much of the grid as possible should be used for the
graph. A ruler should be used to draw the line that
connects the dots.
 All units along both the x-axis and y-axis should have
lines extended to the number/label.
Graph Set-Up Help
• Use math to help set up the graph
• The lower left corner where X and Y axis meet on this graph needs to be
labeled zero for both the x and y axis. (Be sure to extend lines to the number
0 on both the x and y axis.)
• To use as much of the grid as possible, count the lines going along the x-axis
(remember the corner is zero). Divide that number by the total number of
minutes. The number you get is how many lines are between numbers.
(Example 15 lines, 3 is the number you need to get to, so every 5th line is
numbered to represent a minute.– ACTUAL MATH IS DIFFERENT)
• Count the lines on the y-axis. Divide that number by the highest number you
need to get to. The number you get is what you need to count by--Round up to
the next easiest number to count by. (Example 20 lines, highest number is 59
= 2.95. So, each line is worth 3. You would count by threes (0, 3, 6, 9…))
• When plotting your dots, use the number of minutes and degrees. Connect
your line using a ruler. Both the LIGHTS ON and the LIGHTS OFF graph are
double line graphs. Use two different colors, one for soil and one for water.