13: Fertilisers and crop yields Flashcards
1
Q
What are the essential elements plants need?
A
Nitrogen
Phosphorus
Potassium
2
Q
How do plants get these elements?
A
They absorb minerals from the soil using their roots. They cannot absorb insoluble minerals.
3
Q
What are fertilisers?
A
chemicals that provide plants with essential elements
4
Q
What do fertilisers do?
A
they make plants grow bigger and faster, increasing the crop yield.
5
Q
What is eutrophication?
A
The effect of having to much fertiliser in a lake, which causes so much algal growth that fish and other life forms die
6
Q
Process of eutrophication
A
Fertilisers wash into lake Increased nitrate and phosphate in water Algae grows faster Plants shaded by algae die Aerobic decay bacteria use up oxygen Living organisms in water die
