the aromatic effects in growth

The Aromatic Effects in Growth by Garlic and Broccoli

     There are different types of plants that are considered allelopathy plants. Allelopathy plants are plants that produce chemicals that can alter the growth or death of surrounding plants.[i] Garlic and Broccoli are some of the few types. Garlic releases volatiles that have inhibitory properties into the soil where it's grown which is essential to plant growth[ii]. Garlic also possesses antibacterial and antifungal components.[iii] Broccoli releases residue that contains a volatile that is antimicrobial.[iv] This residue effects the growth of cruciferous vegetables.[v] My group and I composed an experiment to see how the two plants affected the growth or death of radish seeds. We believed that the garlic will have an effect on the radish seed germination but broccoli will not.

Experiment

     This experiment is to determine if my hypothesis is correct or incorrect. The materials used were four Petri dishes, radish seeds, crushed fresh garlic, chopped fresh broccoli, filter paper, and water. We place one piece of filter paper in a Petri dish; we then watered the paper but not soaked it; we placed twenty five radish seeds scattered around in the Petri dish; we closed and sealed with masking tape. We repeated this step again so we had two Petri dishes that were exactly the same. We then replicated the two Petri dishes twice but placed a garlic boat in one dish and a broccoli boat in the other. We placed all dishes on the window sill.

Observation

     We watched the Petri dishes for a total of seven days.

Day 1- The garlic began to turn green. One seed in the garlic dish turned yellow. In control 1 dish there was no change; the same for control 2; and the same for the broccoli dish.

Day 2- Control 1 germinated 22 seeds and sprouted 14 leaves. Control 2 germinated 25 seeds and 18 leaves. The garlic dish germinated 24 seeds and 26 leaves sprouted. The broccoli dish germinated 22 seeds and 10 leaves sprouted.

Day 3- Control 1 germinated 23 seeds and 15 leaves sprouted. Control 2 germinated 25 seeds and 25 leaves sprouted. The garlic dish germinated 25 seeds and 30 leaves sprouted. The broccoli dish germinated 23 seeds and 15 leaves sprouted.

Day 4- Control 1 germinated 24 seeds and 31 leaves sprouted. Control 2 germinated 25 seeds and 31 leaves sprouted. The garlic dish germinated 25 seeds and 32 leaves sprouted. The broccoli dish germinated 24 seeds and 19 leaves sprouted.

Day 5- Control 1 germinated 25 seeds and 30 leaves still alive. Control 2 germinated 25 seeds and 27 leaves sprouted. The garlic dish germinated 25 seeds and 30 leaves sprouted. The broccoli dish germinated 24 seeds and 14 leaves sprouted.

Day 6- Control 1 germinated 25 seeds and 19 leaves are still alive. Control 2 germinated 25 seeds and 18 are still alive. The garlic dish germinated 25 seeds and 21 leaves were still alive. The broccoli dish germinated 25 seeds and 12 leaves were still alive.

Day 7- Control 1 germinated 25 and 15 leaves were still alive. Control 2 germinated 25 seeds and 16 leaves were still alive. The garlic dish germinated 25 seeds and 19 leaves were still alive. The broccoli dish germinated 25 seeds and 8 leaves were still alive.

     We had two controls without garlic or broccoli to determine if the variables had an effect of growth on the seeds. The seed germination and the amount of leaves sprouted in the dishes were observed. The two nuisance variables were light and temperature. We stabilized both by keeping both control and experiments in the same environment.

Results

Control 1 and the garlic dish contained close to the same amount of seed germination. But the garlic contained more leave sprouting then Control 1. The Broccoli dish took much more time to germinate its seeds compared to Control 2. Control 2 contained a lot of leave sprouting but in the broccoli dish, the leaves began to sprout but then they all began to die.

Discussion

     My hypothesis states that the garlic will have an effect of the germination of the radish seeds but the broccoli will not. According to my results my hypothesis is correct. The garlic Petri dish had much more growth and sprouting then all the dishes. This is due to that garlic contains volatiles that promote growth in plants. Whereas the broccoli contains antimicrobial residue that "interferes with the growth of other cruciferous crops"[vi] which the radish fall into according to classification.[vii]

Continued Experimentation

     It can be debated that temperature and light could have an effect on the germination of the seeds. Also testing to see if broccoli residue and garlic volatiles have an effect on non-cruciferous plant germination.

  1. www.thefreedictionary.com/allelopathy
  2. http://www.docstoc.com/docs/13025597/Earth-Kind-Gardening-Series---Cultural-Control-Practices and http://resources.metapress.com/pdf-preview.axd?code=qx07235h02198337&size=largest
  3. http://resources.metapress.com/pdf-preview.axd?code=qx07235h02198337&size=largest
  4. http://www.ars.usda.gov/is/np/mba/july96/subbar1.htm
  5. http://edis.ifas.ufl.edu/hs186
  6. http://edis.ifas.ufl.edu/hs186
  7. http://en.wikipedia.org/wiki/Cruciferous_vegetables

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