Potting Soil Lab Part 2
Observation-The plants didn’t grow the 1st time, so we are redoing the experiment with considerable
1. Plant will receive less water
2. Seed will be put deeper in soil
3. Holes will be placed in bottom of cup for excess water to be held
I expect the plant to sprout this time around, and I hope for major growth.
Research Question- What type of potting soil helps the seeds grow best?
Variables IV: Potting Soil DV: Seed Growth
Hypothesis- If I use the Starting Seed soil, then it will grow the most.
Step 1) Gather materials. (Soil: Starting Seed & African Violet, radish seeds, two cups)
Step 2) Fill cups with approximately 125mL of each soil type. Place five seeds in soil about an inch down.
Step 3) Label cups appropriately.
Step 4) Water seeds 30mL of water daily
Step 5) Observe and record plant growth for each day
This graph shows the effect of the soil type on the seed’s growth.
3.5 Day 3
3 Day 4
2 Day 7
1.5 Day 8
0.5 Day 11
0 Series 12
Starting Seed Soil African Violet Soil
Conclusion-My hypothesis was disproven. My changes are listed above. The difference between the
two experiments is astounding. My first ended with not a seed sprout to be seen, but this one is much
more successful. The plant sprouted after only the 4th or 5th day. The changes made affected the
outcome immensely, even though I was not correct with my original hypothesis.