Today we are covering from the specification:. What is an agricultural ecosystem? Animals and...
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Transcript of Today we are covering from the specification:. What is an agricultural ecosystem? Animals and...
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Today we are covering from the specification:
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What is an agricultural ecosystem?
• Animals and plants used to produce food for humans.
• Aims to increase productivity – how?
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What is productivity?• Rate at which useful biomass is
produced.• Plants produce new biomass using…
light energy.• Animals produce new biomass
using…chemical energy from plants/animals
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What is productivity?• The rate at which organisms assimilate
energy taken in is called gross production.• Units – energy/area/time (kJm-2year-1)
• Organisms use some of the new biomass in respiration – what’s left is the net production.
Net Productivity = Gross productivity – Respiratory loss
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Agricultural Productivity
Net Productivity = Gross productivity – Respiratory loss
Similar to a business…
Net profit = Gross Profit – Operating Costs
How can agricultural productivity be increased?
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Task – Agricultural ProductivityCreate a 10-15 minute presentation on one of the topics below. For each one, include:
• What it is;• How it increases productivity;• What ethical/environmental issues can it lead to?
Produce a handout for the rest of the class – it could include notes, fill-in-the-gaps, questions etc..
The use of natural and artificial fertilisers.
Intensive rearing of livestock.
The use of pesticides (chemical and biological) and integrated pest control.
Email/give me a copy of the handout by the end of the lesson on Tuesday. Presentations will be on Thursday 16th October.