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Fertilizers and Pesticides
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Slide 1

Aims of the session:

Aims of the session:

Learn about fertilisers and their effects on the environment.

Be able to answer exam questions on the effects.

Learn about Pesticides and their effects

Summarise the key points about pesticides

Slide 2

Fertilisers and Pesticides

Fertilisers and Pesticides

Slide 3

Fertilisers

Fertilisers

Slide 4

The process of Eutrophication

The process of Eutrophication

Slide 5

The process of Eutrophication cont.

The process of Eutrophication cont.

Slide 6

Biochemical Oxygen Demand (BOD).

Biochemical Oxygen Demand (BOD).

This measures the rate of oxygen consumption by a sample of water, and therefore gives a good indication of eutrophication. A high BOD means lots of organic material and aerobic microbes, i.e. eutrophication

Slide 7

Biochemical Oxygen Demand (BOD).

Slide 8

Biochemical Oxygen Demand (BOD).

Slide 9

Biochemical Oxygen Demand (BOD).

Slide 10

Biochemical Oxygen Demand (BOD).

Slide 11

The nitrate concentration falls during spring and summer and rises during autumn and winter

The nitrate concentration falls during spring and summer and rises during autumn and winter

Less algal growth as autumn begins

Possibly all plants have died

Slide 12

Biochemical Oxygen Demand (BOD).

Slide 13

Pesticides

Pesticides

Slide 14

Pesticides

Pesticides

Include:

Herbicides

Insecticides

Fungicides

Bactericides

Slide 15

Pesticides

Slide 16

Pesticides

Slide 17

Pesticides

Pesticides

Persistence

+ Lipid solubility

= Bioacculmulation

Slide 18

Bioaccumulation

Bioaccumulation

E.g DDT

Slide 19

Bioaccumulation

Slide 20

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