1 / 27

Do Now (5 min.)

Do Now (5 min.). Directions: Answer in complete sentences in your research journals: Which solution has a higher buffering capacity, filtered water or HRE water? Back up your answer with an explanation. What makes a solution have more Buffering Capacity?. HW.

dionne
Télécharger la présentation

Do Now (5 min.)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Do Now (5 min.) Directions: Answer in complete sentences in your research journals: • Which solution has a higher buffering capacity, filtered water or HRE water? • Back up your answer with an explanation. • What makes a solution have more Buffering Capacity?

  2. HW • Complete your Germination Lab report.

  3. How does electrical conductivity relate to plant nutrition? Mr. M. Gonzalez

  4. Objectives • I can explain why organisms of the plant kingdom need nutrients. • I can describe the relationship between elements and nutrients. • I can relate electrical conductivity to nutrients.

  5. Question? • How can a plant perform photosynthesis? http://www.eoearth.org/files/121601_121700/121668/Irrigation-photosynthesis.gif

  6. Make a list of the elements you see on this figure in your notebooks. • Use your table of elements.

  7. Question? • Why does a plant perform photosynthesis?

  8. Because it needs to make ATP - plant body energy!

  9. C = Carbon H = Hydrogen N = Nitrogen O = Oxygen P = Phosphorus S = Sulfur Mg = ? Na = Sodium Cl = Chlorine K = Potassium Ca = Calcium Fe = Iron Cu = Copper Zn = Zinc Others You may have noticed CHNOPS.

  10. What element is Mg. • Notice it makes up the heart of this molecule.

  11. Proteins Carbohydrates Plants also need to make the 4 organic compounds that make up their body. Which requires ATP Nucleic Acids Lipids

  12. So, how does electrical conductivity relate to this? • Electrical Conductivity is a measure of the rate (how fast) at which a small electric current travels through a solution. http://hothardware.com/newsimages/Item15076/Electricity.jpg

  13. Molecules & Nutrients • Most plant nutrients (plant food) are made of charged molecules or salts. • The more nutrients (salts) the faster the electricity will travel through the solution.

  14. Element + Element = Molecule • When some elements come together they form charged molecules or salts. • Nutrients and plants (+ all living things) are made of molecules!

  15. So, in a sense, living molecules (life) needs non-living molecules (nutrients) to keep on living.

  16. Question • What will happen to the electrical conductivity if there are a lot of nutrients (salts) in a solution?

  17. Answer • If you send a small electrical current through a solution with a lot of nutrients the electricity will travel very fast. • This means you will get a big measurement.

  18. Measuring EC • You can use the Hanna Combo Meter to measure EC. • The units that measure EC are “µS” and they appear at the top right-hand portion of the screen. • Press the set button firmly and continuously until it appears. µS

  19. Remember • Conductivity is a measure of the rate at which a small electric current flows through a solution. • When the concentration of nutrients is high, the current will flow ________. • When the concentration of nutrients is low then the current will flow ________.

  20. Question • Why is measuring EC important?

  21. Why is measuring EC important? • Measuring the EC of your solution is important because it will determine if it has enough nutrients to feed your plants.

  22. 3 EC Facts • An EC meter shows the reading in microohms per centimeter cubed (µMho/cm3) or microsiemens per centimeter cubed (µS/cm3). • 1 µMho/cm3 = 1 µS/cm3 • High temperatures will affect the EC measurement giving.

  23. EC levels for most plants

  24. Problems With Nutrients • When a plant uses a nutrient from a chemical “salt” molecule in a nutrient solution, it is actually only using up a part of that molecule. The remaining part of that molecule generally stays in the solution and can eventually reach dangerous levels of concentration. • What needs to be done?

  25. Log entry (5 min.) • Explain why organisms of the plant kingdom need nutrients. • Describe the relationship between elements and nutrients. • Explain how electrical conductivity relates to nutrients.

  26. HW • Complete your Germination Lab report.

  27. Bibliography • Nelson/Pade Multimedia (1999). Hydroponics Guide. 100+p.

More Related