food production and the environment
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Food Production and Food Production and the Environmentthe Environment
The Carbon CycleThe Carbon Cycle
Carbon dioxide in the air
Carbon dioxide in the air
Green plants use carbon dioxide to make their food
Carbon dioxide in the air
Green plants use carbon dioxide to make their food
Green plants are eaten by animals
Carbon dioxide in the air
Green plants use carbon dioxide to make their food
Green plants are eaten by animals
respiration
carbon dioxide in the air
green plants use carbon dioxide to make their food
green plants are eaten by animals
respiration
dead remains of plants and animals
carbon dioxide in the air
green plants use carbon dioxide to make their food
green plants are eaten by animals
respiration
dead remains of plants and animals
decay by fungi and bacteria
DecayDecay
Fungi and bacteria Fungi and bacteria are responsible for are responsible for the decay of dead the decay of dead organisms.organisms.
DecayDecay
In order to be able In order to be able to carry out decay, to carry out decay, fungi and bacteria fungi and bacteria need:need:
1.1. OxygenOxygen
2.2. MoistureMoisture
3.3. The correct The correct temperaturetemperature
The Nitrogen CycleThe Nitrogen Cycle
nitrogen in the air
nitrogen in the air
fertilizersfertilizers
nitrogen in the air
fertilizersfertilizers
waste substances e.g. faeces
nitrogen in the air
fertilizersfertilizers
waste substances e.g. faeces
lightning
nitrogen in the air
fertilizersfertilizers
waste substances e.g. faeces
lightning
Nitrogen-fixing bacteria in the soil
nitrogen in the air
fertilizersfertilizers
waste substances e.g. faeces
lightning
Nitrogen-fixing bacteria in the soil
Nitrogen-fixing bacteria in the root nodules of clover
nitrogen in the air
fertilizersfertilizers
waste substances e.g. faeces
lightning
Nitrogen-fixing bacteria in the soil
Nitrogen-fixing bacteria in the root nodules of cloverdead remains of
plants and animals
nitrogen in the air
fertilizersfertilizers
waste substances e.g. faeces
lightning
Nitrogen-fixing bacteria in the soil
Nitrogen-fixing bacteria in the root nodules of cloverdead remains of
plants and animals
nitrates in the soil
fertilizersfertilizers
waste substances e.g. faeces
lightning
Nitrogen-fixing bacteria in the soil
Nitrogen-fixing bacteria in the root nodules of cloverdead remains of
plants and animals
nitrates in the soil
denitrifying bacteria in the soil break down nitrates
The nitrogen cycleThe nitrogen cycle
Living things need Living things need nitrogen to make nitrogen to make protein.protein.
They can not use the They can not use the nitrogen in the airnitrogen in the air
The nitrogen in the The nitrogen in the air must be changed air must be changed to to nitratesnitrates before before plants can use it.plants can use it.
The nitrogen cycleThe nitrogen cycle
Animals get their Animals get their nitrogen by eating nitrogen by eating plants.plants.
The nitrogen cycleThe nitrogen cycle
The roots of some The roots of some plants (e.g. clover, plants (e.g. clover, pea & beans) have pea & beans) have swellings called swellings called root root nodules nodules on them.on them.
Nitrogen-fixing Nitrogen-fixing bacteria living in bacteria living in these nodules these nodules change nitrogen in change nitrogen in the air into nitrates.the air into nitrates.
The nitrogen cycleThe nitrogen cycle
The nitrogen-fixing The nitrogen-fixing bacteria are essential bacteria are essential to maintain the to maintain the fertility of the soil.fertility of the soil.
Without them food Without them food yields would rapidly yields would rapidly fall.fall.
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