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9-5 Project 1 March 2 2008

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How Does Salt Effect Plants. 9-5 Project 1 March 2 2008. The purpose of my project is to see the effect that salt has on plants. Purpose. My hypothesis is that the salt will have a negative effect on the plants. I think that road salt will have the most negative effect on the plants.

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How Does Salt Effect Plants

9-5 Project 1

March 2 2008


My hypothesis is that the salt will have a negative effect on the plants. I think that road salt will have the most negative effect on the plants.

  • 4 9'' plant pots
  • 4 plants ( Dumb cane 'Camille')
  • Road salt
  • Road salt/sand
  • Saltwater (from the ocean)
  • Measuring tape
  • Room temperature water
  • Potting soil
  • First replant the plants into the 9'' pots using potting soil.
  • Place 1 tbl spoon of road salt onto the surface of the soil onto one plant, and 1 tbl spoon of salt/sand onto another plant.
  • Water 3 plants (the control, the sand/salt and the salt) with ½ cup each of room temperature water. Water the final plant with ½ cup of room temperature seawater.
Continue steps 3 & 4 every day for 2 weeks. Measure and record each plant every day noting changes in color and amount of leaves.
  • Every second day add one tablespoon of salt and salt/sand to 2 of the plants. (label each one so that you can know what to put on each.)

Manipulated Variable: Different types of salt on each plant.

Responding Variable: How the plants react to the salt. Ex; Height, color etc.

Control Variables: - type of plant

- size of pot

- type of soil

-amount of water added

- amount of salt added. ( for the two that had salt.)


Changes While growing:

Salt: - turned yellow and started to droop at day 3

- turned brown at day 8

Water: - New leaves started to come at day 5

- new leaves opened at day 11

Sand/Salt: -Started to turn yellow at day 2

Sea water: -A couple of leaves turned yellow at day 7


Salt day 0 Salt day 14

Water day 0 Water day 14

Sand/salt day 0 Sand/salt day 14

Seawater day 0 Seawater day 14


My conclusion is that yes, salt does effect plants. My hypothesis was correct when I said that salt does effect plants. However I was incorrect when I guessed that the plain road salt would effect the plants most, the sand/ salt effect the plants the most.

sources of error
Sources of Error
  • The plants were not the exact same height when i started the experiment.
  • The water may not have been the exact same temperature every time because i did not check. However it was were room temperature
  • The plants were watered with ½ cup of water each day which might have been too much.
  • Human error. I may have made an error in measuring and recording the plants.
  • I did not water the plants at exactly the same time every day.
ways to improve
Ways to Improve
  • Start the plants from seed that way they would all start from the same point.
  • Use a controlled light source.
  • Do the experiment again to see if results come out differently.
  • Make sure that the temperature of the water is the exact same every time.