Ecology of Organisms Experiment 1: Effects of pH on Radish Seed Germination Natu

Question

Ecology of Organisms Experiment 1: Effects of pH on Radish Seed Germination Natural sol pH depends on the parent rock material trom which it was formed and processes, such as cimate Sol pli is a moasure of the ackdily or alkalinfy of the sol Acdic soils are considered to have a ph of50 or lower, whereas 1010 or above is consadered a strong basic or alkaline sol The pH of sod affects te sokbiäity of nutnents in so water I therefore also affects the amount of rutrients available for plant uptake. Diflorent nutrionts are available under ditening p conditions In this expenment, we will look at the effect of pH on the gonmination and growth rate of radish seeds to determine the range of pH tolerance for the seed. Acdc cr basic water w be used to shituite acory or alkalinity n sol Material .Paper Towel Sheets (cut to fit into the petri dish) 2mL45% Acetic Acid (hegar). | (31 5 cm Petri Dishe 3 pht Test Strips Radiuh Seed Packet Sunny Location 2ml 15% Saturated Soham Bicarbonate Baking Soda) Solution, Natco You Must Provide 5 6 8 9

Explanation / Answer

The Effect of pH on Radish Growth and Germination
-Precitipation at elevated level of nitric and sulphuric acid led to lower level of pH
- pH of acid rain recorded was around 4.2-4.4 (5)

Effects:
- It Kills all microorganisms
- It Releases toxins into soil
- It Strips essential nutrients from plant leaves, making plant susceptible to disease
- Moisture of soil will always affect the flavour of the radishe
-Air pollution worsens, acid rain & acid deposition
- It is Harmful to vegetation
- Can be detrimental to the food production

Theory-
1. The more the lower the pH, the weaker the plants would be in terms of seed germination.
2. If we lower down the pH of the watering solution to acid, then the plant growth will be delayed.
3. If we increase the pH of the watering solution to the basic, then the plant growth will be delayed, but will not be inhibited altogether.

Basic
(pH 9) - did not germinate

Acidic
(pH 3)- seeds slowly germinated, three seeds germinated within five days

Neutral
(pH 7) - 10 seeds germinated within five days

Experiment #2: In terms of Growth

Acidic
(pH 5.6) - Recorded every three days five times, the plant grew 2.5cm, then stopped growing.

Highly Acidic
(pH 4.5) - Recorded every three days five times, the plant grew 0.3cm, 0.5cm, 0.20cm and 0.35cm.

Neutral
(pH 7) - Recorded every three days five times, the plant grew 2.7cm, 1cm and 0.5cm.

- Place in even more ideal conditions (i.e. direct sunlight, regulated temperatures)
- Consistently monitor the moisture of the soil to attend to the needs of the radishes instead of using a set schedule for watering
- Use a large planting location for more soil depth

-It is proven that acidic rain prevents the radish growth and seed germination.
- The effects of pH change were greater than expected.
- Radishes had a confined range of ideal pH: Even small were deviations prevented from germination
- If acid rain came consistently, the earth would become devoid of radishes.

Result

1. Absolute Growth
2.Qualitative Observations
3. 8 peat pellets in trays
4. Diluted vinegar and saturated baking soda solutions:
It was Watered a few mL every day and it was Recorded for germination , Monitored and recorded plant growth every 2 days

Healthy radish after 24 days

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