Ion for proteins?
Reveal answer
Nitrate.
Key words: nitrate
6(a) FOOD PRODUCTION · RECALL
6.3 Fertiliser and crop yield
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Ion for chlorophyll?
Reveal answer
Magnesium.
Key words: magnesium
Ion for DNA and roots?
Reveal answer
Phosphate.
Key words: phosphate
Manure vs artificial fertiliser?
Reveal answer
Manure: cheap, organic matter, slow. Artificial: exact, fast, leaches.
Key words: organic
Why not over-fertilise?
Reveal answer
No extra yield + cost + eutrophication.
Key words: eutrophication
How are minerals absorbed by roots?
Reveal answer
Active transport.
Key words: active
What is meant by the term fertiliser?
Reveal answer
A substance added to soil to supply mineral ions for plant growth.
Key words: fertiliser
What is meant by the term NPK fertiliser?
Reveal answer
Fertiliser containing nitrogen, phosphorus and potassium.
Key words: NPK fertiliser
Natural and artificial fertilisers: for Mineral content, give the natural (manure, compost) and the artificial (npk).
Reveal answer
Natural (manure, compost): Variable and unknown. Artificial (NPK): Precise and known.
Key words: Mineral content
Natural and artificial fertilisers: for Speed of release, give the natural (manure, compost) and the artificial (npk).
Reveal answer
Natural (manure, compost): Slow, as it decomposes. Artificial (NPK): Rapid, as soluble ions.
Key words: Speed of release
Natural and artificial fertilisers: for Soil structure, give the natural (manure, compost) and the artificial (npk).
Reveal answer
Natural (manure, compost): Adds organic matter and improves structure. Artificial (NPK): No organic matter added.
Key words: Soil structure
Natural and artificial fertilisers: for Leaching risk, give the natural (manure, compost) and the artificial (npk).
Reveal answer
Natural (manure, compost): Lower but still possible. Artificial (NPK): Higher if overused.
Key words: Leaching risk
True or false, and why? “Fertiliser is plant food.”
Reveal answer
False. Plants make their own food by photosynthesis; fertilisers supply mineral ions.
True or false, and why? “More fertiliser always means more yield.”
Reveal answer
False. Above the amount needed, yield plateaus and excess is wasted or leached.
True or false, and why? “Natural fertilisers cannot cause pollution.”
Reveal answer
False. Manure can also leach minerals and cause eutrophication if overused.