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Experiment 10122012

Experiment 10122012. Effect of Road Salt on Seed Germination. Introduction. Today you will be setting up a controlled experiment on the effect of road salt on seed germination Write the title ‘Introduction ‘under your lab accession number and title

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Experiment 10122012

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  1. Experiment 10122012 Effect of Road Salt on Seed Germination

  2. Introduction • Today you will be setting up a controlled experiment on the effect of road salt on seed germination • Write the title ‘Introduction ‘under your lab accession number and title • Then copy the information from the next slide under the section ‘Introduction’

  3. Relevance • Road salt is used in Loudoun County in HUGE quantities during the winter • LC went from just adding de-icing agents during a storm • Now the county pre-treats roads excessively • In addition, when we are in a drought situation, farmers irrigate their land with river water • After many years of irrigation, farmland contains so much river salt that crops die, remember Babylon!

  4. Is salt bad? • Yes • Most plants are not salt tolerant • When exposed to too much salt, they die

  5. Our original and creative question • If salt is bad for plants, is it also bad for seeds?

  6. Hypothesis • Now it’s your turn to make a decision • Write an hypothesis • Hypothesis format • If salt is added to seeds, it will/will not decrease seed germination • Choose either will or will not

  7. Procedure-Write this down • There will be 3 groups: first row of tables will be control group, second row low salt group, third row high salt group • For each table gather appropriate zip loc bag, marked with C, hi, or lo and 1, 2,3,4,5 • 2 seeds • 1 cotton puff • Add seeds to the bag • Record the number of your bag here________

  8. Procedure continued • One group at a time, go to the appropriate salt/no salt station and dip the cotton puff for 10 seconds in the liquid • Add the wed cotton puff to your seed bag • Place the seed bag on the shelf labeled with your block number • Check for seed germination during class for 2 weeks • Add your data to your data table

  9. Data Table • Copy this table from the board into your nature journal

  10. Discussion • What does a seed need to germinate? • Water • Light • Soil • Write your answer in your nature journal

  11. Results • After 2 weeks of data collection, draw a graph of the class data • X axis will be Control, Low Salt, High Salt • Y axis will be number of seeds germinated • This will be a bar graph

  12. Analysis • What happened during the experiment? • How many seeds germinated in the control? • How many seeds germinated in the low salt? • How many seeds germinated in the high salt?

  13. Conclusion • Did you accept or reject your hypothesis? • Write : Based on the results of this experiment, I accept/ reject (choose 1) my hypothesis. Therefore, salt does/does not (choose 1) have an effect on seed germination. • Briefly describe how LC should change or not change its de-icing practices based on your data.

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