Fertilisers

Question 0

What do fertilisers do?

Answer 0

Replace missing elements or produce more of them
Increases crop yield - grow faster and bigger
Dissolves in water and is taken in by roots

Question 1

What are the 3 main elements in fertilisers?

Answer 1

Nitrogen, phosphorus, potassium

Question 2

Why does neutralising nitric acid and ammonia give good fertiliser?

Answer 2

Forms ammonium nitrate

Provides nitrogen from 2 sources - ammonia and nitric acid

Question 3

How is ammonium sulfate used as a fertiliser?

Answer 3

Make it by neutralising sulfuric acid with ammonia

Question 4

How is ammonium phosphate made as a fertiliser?

Answer 4

By neutralising phosphoric acid with ammonia

Question 5

How is potassium nitrate made as a fertiliser?

Answer 5

Neutralising nitric acid with potassium hydroxide

Question 6

How are fertilisers useful?

Answer 6

Population is rising, fertilisers increase crop yield so can feed more people

Question 7

What are dangers of too much fertilisers?

Answer 7

Polluting water supply

Causing eutrophication

Question 8

What is eutrophication?

Answer 8

Fertilisers damaging lakes and rivers

Question 9

How do fertilisers damage lakes and rivers?

Answer 9

Fertiliser runs off field into rivers
Levels of nitrates and phosphates increases
Algae in river multiply rapidly creating algae bloom ( green carpet on water) which blocks light to plants below and they die
Aerobic bacteria feed on dead plants and multiply, using up oxygen
Fish and insects die