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

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

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

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

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?

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

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

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

Plenary Mark and improve this answer