The purpose of this experiment is to encourage students to experiment with different variables to develop their own seed starting “Miracle Mix.” Students will test three different recipes to find out which recipe is the best mix for starting seeds.
Below we have selected high school and middle school Next Generation Science Standards that relate to this lesson; expand on this experiment to connect directly to these standards:
- HS-LS2-5. Develop a model to illustrate the role of photosynthesis and cellular respiration in the cycling of carbon among the biosphere, atmosphere, hydrosphere, and geosphere.
- MS-LS1-5. Construct a scientific explanation based on evidence for how environmental and genetic factors influence the growth of organisms.
- Growing Mediums:
- Worm Castings
- Green Sand
- Rock Phosphate
- Small Pots (at least 3 per group)
- Seeds (recommended: lettuce)
- Spray Bottles (for watering)
- Lab Report (attached)
- Have students research the list of growing mediums or ingredients.
- Students should design the experiment deciding ahead of time on soil recipes.
- Students will write a hypothesis, predicting the recipe that will have the greatest effect on the seeds’ germination rate.
- Students visit various stations and create their soil recipes.
- Students will plant seeds in each sample, keeping all other variables the same; students make sure to use the same amount of seeds and water in each sample.
- Students record daily observations on lab report.
- At the end, students analyze their data and report results in an experimental conclusion.