If SafeTsalt stunts plant growth, kills plant leaves, and can harm soil nutrience to the extent of making it inhabitable for life, then I think it will be the worst for the plants, out of, it's self, exhaust, car soap, and regular tap water. I think this because the others have similar and different effects on plants, and their all (tap water aside) pretty bad for plant health, but only the SafeTsalt can make spots where plants can not grow. I think SafeTsalt will be the worst for the plants.

SafeTsalt: SafeTsalt is just the name of a brand of road salt. Further research on SafeTsalt, or road salt, says that it can harm the plants leaves, and stunt plant growth. I also found that it can make patches of soil inhabitable the to much salt in the ground/soil.

Car Soap: Is just the same solution as the soap that car washes might use. It can kill leaves, and and can threaten the plants survival, and can harm roots.

Exhaust: Is the same as the exhaust coming out of your vehicle. Exhaust can stunt plant growth, and also threaten the plants survival. It can also, in high concentrations, dessolve plant roots.

Controlled Variables: -Watered plants 15ml a day -Time and Place -Type of soil -Types of pots -Temperature of soil (19 degrees celsIius) -Same amount of soil -Amount of light -Type of plant (peas)

Responding Variables: -Plant growth and speed -Amount of leaves -Plant condition - First to germinate -First to grow leaves -Most germinated -Colour -Plant weight

Manipulated Variables: The car related pollutants were intoduced to plants by being mixed into the water we were watering them with. -Control: Plant water -Car soap: Tap water mixed with car Soap, 48 parts water, 1 part car Soap (typical washing solution) -SafeTsalt: 25g/liter (typical sea water) -Exhaust: Tap water passed through exhaust stream 10 times

1: Make water to water plants with. 1A: Get four 3 liter jugs of water. 1B: In one jug, mix in 2.8 tablespoons of car soap, inin the second, add 75 grams of SafeTsalt, in a third jug, add exhaust, and leave the last jug full of normal tap water. 2: Pour out a small amount of each jug into different cups, and leave leave nine pea seeds in each cup for 48 hours. 3: After 48 hours, fill 36 small plant pots with an equal amount of soil, and put one seed from before into each pot (make sure to label by which type of water that they were sitting in). 4: Continue to record data on how tall each plant is, leaf condition, stem condition, and how many of each type germinate, starting from step three. 5: Continue to water each plant 15ml every second day.

General Observations: -The car soap plants looked slightly more yellow, in general, than all the others (exhaust and control) -2 of the exhaust plants germinated pretty late, and stopped growing completely around 1cm -None of the SafeTsalt plants grew at all -All germinated control plants were healthy

Plant Germination: The control started to germinate on the 5th day, the exhaust started germinating on the 6th along with the car soap. 4 control germinated, 8 exhaust, 6 car soap, and 0 SafeTsalt.

Average Plant Height: 2 of the exhaust plants germinated pretty late, and stopped growing completely around 1cm tall. The control grew fastest. Exhaust and car soap were similar, and SafeTsalt didn't grow at all

Number of Leaves: The control plants have the biggest average number of leaves. Exhaust and car soap have a really similar amount of leaves, but car soap had a little more.

Total Weight, Plants, and Weight per Plant: No SafeTsalt plants grew out of all nine seeds I planted. All the other types had at least 4 plants grow. Exhaust had the most weight, and the most plants, but control had a bigger average plant weight.

Absolutely no SafeTsalt plants grew. All the others (car soap, control (tap water), and exhaust) had at least four plants grow, exhaust had the most weight and plants, but the control had more leaves, and a bigger average plant height. I also think that since the exhaust water was water run through an exhaust stream, I made it actually better for the plants because plants have adapted to rain water, and rain water runs through the sky that has exhaust in it, adding chemicals that were filtered out of the tap water.

My hypothesis was correct because, absolutely no SafeTsalt plants grew, but all of the other types (car soap, exhaust, control (tap water) had at least four of their nine plants grow. This is because the salty water drew a lot of the fresh water out of the plants, causing dehydration through osmosis.

In the Future: In the future, I would like to test how this experiment would be different with other types of plants, and/or different concentrations of the pollutants In the future, people should be careful about where they put salt to met ice, or add grip to the roads, and how much they use, as it, clearly, is bad for the environment.

Sources of Error: We stopped watering the plants 10ml every day, and started to water them 15ml every second day, which might have affected the results.

Citations: -”What type of plants are best for science projects”, Sciencing, https://www.sciencing.com/type-plants-science-projects-8089604/  -”The pollution conveyed by urban runoff: A review of sources”, ScienceDirect, https://www.sciencedirect.com/science/article/pii/S0048969719361212  -”Road salt management plan”, Calgary,  https://www.calgary.ca/roads/conditions/snow-ice-salt.html  -”5 DIY Car Wash Soap Alternatives Found in Your Home (Easy to Use!)”,  HOMEGRAIL, 5 DIY Car Wash Soap Alternatives Found in Your Home (Easy to Use!) | Home Grail -”The Impact Of Stormwater Car Emissions, Stormwater Shepherds,  The Impact of Stormwater – Car Emissions – Stormwater Shepherds  -”What’s the PH Level of Acid Rain?”, The Geography Atlas, https://www.youtube.com/results?search_query=What+is+the+ph+level+of+acid+rain  -”Watering Pea Plants: How Frequently for Best Results?”, Shuncy, https://shuncy.com/?s=Watering+Pea+Plants%3A+How+Frequently+For+Best+Results%3F 

-”Watering Pea Plants: How Frequently for Best Results?”, Shuncy, https://shuncy.com/?s=Watering+Pea+Plants%3A+How+Frequently+For+Best+Results%3F  -”How Does Soap Affect The Growth Of Plants?”, OgGardinline, https://oggardenonline.com/how-does-soap-affect-the-growth-of-plants.html  -”The Effects of Salt on Plants: Good or Bad?”, GreenPacks, https://greenpacks.com/search?q=The+Efffects+of+Salt+on+Plants:%20Good%20or%20Bad? 

A special thanks to my teachers: Ms. Million, Ms. McNiel, along with my dog, my mom, and especially my dad! These people helped support me and my project!