1. Starter: What could we add to make plants grow more?
Farming Problems
Starter: What could we add to make plants grow more?

2. Learning Objectives
Use models to explain the changes in the environment
Evaluate the advantages and disadvantages of different farming methods.

3. Killing pests and growing what we want
Pesticides
Fertilizers
Kill things we don’t want
Pest plants (weeds)
Pest animals
Pest insects
Pest fungus
Add extra nutrients
Makes bigger plants
Plants are more successful

4. Sometimes things we don’t expect happen
Left egg is a normal egg
Right egg was affected by DDT
DDT was only meant to kill mosquitos
The chick died

5. Food chain consequences
Complete the Using herbicides sheet in your booklet
Herbicides are a type of pesticide
How can animals we don’t want to be affected still be affected?

6. Fertilizers Help plants grow Added to fields
Too much fertilizers added
Spare fertilizer leaks away and fertilizes nearby land

7. This lake is too fertilized
The fertilizers came from the grass being fertilized
All the fish are dead

8. Design a leaflet
On one page encourage farmers to use less pesticides and fertilizers
Could we not use chemicals? What else could kill pests?

9. Plenary
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