1. NOVEMBER 28, 2016 T.O.C. Necessary Nutrients POST LAB
DO NOW: Read article “Fertilizer Runoff Overwhelms Streams and Rivers – Creating Vast “Dead Zones” answer questions
LEARNING TARGET: I can explain: factors, including matter and energy, in the environment that limit the growth of plant and animal populations in natural ecosystems
LESSON: What are the results of the lab; What do they tell us? How does nitrogen in the soil get into water? Is it a problem?

2. How did the problem start?
What is an unintended consequence this?
What is causing the problem?
How do scientists know that there is a severe problem (What is their research?)
What is making the problem worse?
What solution do the scientists recommend?
What are the drawbacks of this solution?

3. VOCABULARY FOR ARTICLE
Biofuel: Fuel made from things like crops
Nitrate: A form of nitrogen that plants can absorb
Fertilizer: a man-made chemical added to crops to help them grow
Mandate: an official order to do something
Dead Zone aTypeID=3&ResourceID=104616
Isotope
Pristine: Untouched, uncontaminated and clean
Hypoxia: without oxygen
denitrification

4. RADIOACTIVE ISOTOPE

5. The Nitrogen Cycle
NITRIFYING BACTERIA
DENITRIFYING BACTERIA

7. Hood Canal

8. http://www. seattletimes

10. Why is nitrogen important
It is part of proteins
It is found in DNA
It makes up 78% of atmosphere, but animals and most plants can’t use it like that.
It must be FIXED (combined with Oxygen) to be used by plants
Bacteria do this Fixing

11. Most plants need nitrogen in the form of nitrates to grow
Most plants need nitrogen in the form of nitrates to grow. They get this from soil.
Bacteria in the soil combine N with H or O this is fixing
Animals get nitrogen to make their proteins by eating plants or other animals.
Nitrogen returns to the soil through waste and death

12. FERTILIZERS Substances rich in plant nutrients that people add to soil
Fertilizers commonly contain nitrogen [N], phosphorus [P], and potassium [K].

13. Fertilizers cont.
The increased crop yields of today are due to the use of MANUFACTURED fertilizers, which are mixtures of chemicals produced at factories These fertilizers are expensive because fertilizer production is a costly, energy-intensive process They frequently runoff of the area they were spread

14. RUNOFF
Runoff often ends up in streams, lakes, and other bodies of water, including reservoirs that provide drinking water.

15. In this Activity…
You will test fertilized and unfertilized soils for the presence of nitrates [NO3-], the form of nitrogen most easily used by plants.
You will also test the nitrate level found in the runoff water that is not absorbed by the soil
You will convert the nitrates to nitrites [NO2-] and then allow them to react with a dye that turns pink in the presence of nitrites.

16. Testable Question
How does the type of soil [potting soil OR local soil] affect the amount of nitrogen that can be absorbed?

17. Stop P.2 11/23

18. Conclusions
Write conclusions for this Lab Investigation, as instructed by your teacher.