geography of food

problems due to intensifying food production

due to

Irrigation

due to

Irrigation

SalinisationNaCl

due to

Irrigation

SalinisationNaCl

Waterlogging

due to

Irrigationdue to

Chemicals

SalinisationNaCl

Waterlogging

due to

Irrigationdue to

Chemicals

SalinisationNaCl

Waterlogging

Imbalanceof soil nutrients

due to

Irrigationdue to

Chemicals

SalinisationNaCl

Waterlogging

Imbalanceof soil nutrients

Euthrophication

due to

Irrigationdue to

Chemicals

SalinisationNaCl

Waterlogging

Imbalanceof soil nutrients

Water Pollution

Euthrophication

due to

Irrigationdue to

Chemicals

SalinisationNaCl

Waterlogging

Imbalanceof soil nutrients

Water Pollution

Euthrophication

How to remember it better

due to

Irrigationdue to

Chemicals

SalinisationNaCl

Waterlogging

Imbalanceof soil nutrients

Water Pollution

Euthrophication

tating

How to remember it better

due to

Irrigationdue to

Chemicals

SalinisationNaCl

Waterlogging

Imbalanceof soil nutrients

Water Pollution

Euthrophication

ty

tating

How to remember it better

due to

Irrigationdue to

Chemicals

SalinisationNaCl

Waterlogging

Imbalanceof soil nutrients

Water Pollution

Euthrophication

ty

tating

How to remember it better

due to

Irrigationdue to

Chemicals

SalinisationNaCl

Waterlogging

Imbalanceof soil nutrients

Water Pollution

Euthrophication

ty

tating

ly

How to remember it better

due to

Irrigationdue to

Chemicals

SalinisationNaCl

Waterlogging

Imbalanceof soil nutrients

Water Pollution

Euthrophication

ty

tating

ly

How to remember it better

due to

Irrigationdue to

Chemicals

SalinisationNaCl

Waterlogging

Imbalanceof soil nutrients

Water Pollution

Euthrophication

ty

EKY

tating

ly

How to remember it better

due to

Irrigationdue to

Chemicals

SalinisationNaCl

Waterlogging

Imbalanceof soil nutrients

Water Pollution

Euthrophication

ty

EKY

tating

ly

How to remember it better

due to

Irrigationdue to

Chemicals

SalinisationNaCl

Waterlogging

Imbalanceof soil nutrients

Water Pollution

Euthrophication

due to

Irrigation

SalinisationNaCl

Waterlogging

Water from irrigation has salts

Crops

Water from irrigation has salts

Crops

Water from irrigation has salts

Crops

Salts are carried into the soil by water. Salts are left behind after water dries up.

Salts are carried into the soil by water. Salts are left behind after water dries up.

More irrigated water = more salts brought in

More irrigated water = more salts brought in

As the water dries up, more salts are left behind.

As the water dries up, more salts are left behind.

Over time, the too much salt accumulates in the soil, and the soil becomes salinised. This prevents the crops from growing.

Over time, the too much salt accumulates in the soil, and the soil becomes salinised. This prevents the crops from growing.

Over time, the too much salt accumulates in the soil, and the soil becomes salinised. This prevents the crops from growing.

Cross-section of a an area that is salinised. The white crystals are salts!

due to

Irrigation

SalinisationNaCl

Waterlogging

due to

Irrigation

SalinisationNaCl

Waterlogging = Soil has too much water

due to

Irrigation

SalinisationNaCl

Waterlogging = Soil has too much water

due to

Irrigation

SalinisationNaCl

Waterlogging = Soil has too much water

Not enough air in soil for crops to grow

due to

Irrigationdue to

Chemicals

SalinisationNaCl

Waterlogging

Imbalanceof soil nutrients

Water Pollution

Euthrophication

due to

Irrigationdue to

Chemicals

SalinisationNaCl

Waterlogging

Imbalanceof soil nutrients

Water Pollution

Euthrophication

due to

Irrigationdue to

Chemicals

Waterlogging

Imbalanceof soil nutrients

Water Pollution

Euthrophication

http://www.youtube.com/watch?v=UGqZsSuG7ao

Farmers tend to apply too much fertilisers

Excess fertilisers gets washed into rivers and lakes by rain

Excess nutrients in rivers and lakes due to fertilisers

Encouraged the growth of algae

Excessive algae

Excessive algae

Excessive algae

Farmers tend to apply too much fertilisers

Excess fertilisers gets washed into rivers and lakes by rain

Excess nutrients in rivers and lakes due to fertilisers

Encouraged the growth of algae

Algae block the sunlight and compete for oxygen

Farmers tend to apply too much fertilisers

Excess fertilisers gets washed into rivers and lakes by rain

Excess nutrients in rivers and lakes due to fertilisers

Encouraged the growth of algae

Algae block the sunlight and compete for oxygen

Plants at the bottom of rivers and lakes are unable to survive --> Die

Farmers tend to apply too much fertilisers

Excess fertilisers gets washed into rivers and lakes by rain

Excess nutrients in rivers and lakes due to fertilisers

Encouraged the growth of algae

Algae block the sunlight and compete for oxygen

Plants at the bottom of rivers and lakes are unable to survive --> Die

Plants then decomposes, removing more oxygen from the water, making it difficult for other animals to survive.

due to

Irrigationdue to

Chemicals

Waterlogging

Imbalanceof soil nutrients

Water Pollution

Euthrophication

humus =

black stuff in soil

humus =

decomposed organicmaterial

(plants, animals etc.)

humus =

provides a varietyof nutrients in soil

humus

humus =

provides a varietyof nutrients in soil

humus

humus =

provides a varietyof nutrients in soil

humus

soil with humus soil without humus

humus =

provides a varietyof nutrients in soil

plants absorb a variety of nutrients

plants absorb a variety of nutrients

plants absorb a variety of nutrients

but chemical fertilisers only replace Nitrogen and Phosphorus

but chemical fertilisers only replace Nitrogen and Phosphorus

N

N

but chemical fertilisers only replace Nitrogen and Phosphorus

N

N

P

P

but chemical fertilisers only replace Nitrogen and Phosphorus

N

N

P

P

N

N

P

P

N

N

P

P

plants absorb a variety of nutrients

N

N

P

P

plants absorb a variety of nutrients

N

N

P

P

plants absorb a variety of nutrients

N

N

P

P

plants absorb a variety of nutrients

N

N

P

P

Soil left with a lot of Nitrogen and Phosphorus, but

not other nutrients.

N

N

P

P

Soil left with a lot of Nitrogen and Phosphorus, but

not other nutrients.

N

N

P

P

Soil left with a lot of Nitrogen and Phosphorus, but

not other nutrients.

N

N

P

P

nutrients in soil becomes

imbalanced

N

N

P

P

nutrients in soil becomes

imbalanced

N

N

P

P

nutrients in soil becomes

imbalanced

before - a variety of nutrients

N

N

P

P

after - only a few kind of nutrients.

problems due to intensifying food production

due to

Irrigation

due to

Irrigation

SalinisationNaCl

due to

Irrigation

SalinisationNaCl

Waterlogging

due to

Irrigationdue to

Chemicals

SalinisationNaCl

Waterlogging

due to

Irrigationdue to

Chemicals

SalinisationNaCl

Waterlogging

Imbalanceof soil nutrients

due to

Irrigationdue to

Chemicals

SalinisationNaCl

Waterlogging

Imbalanceof soil nutrients

Euthrophication

due to

Irrigationdue to

Chemicals

SalinisationNaCl

Waterlogging

Imbalanceof soil nutrients

Water Pollution

Euthrophication

Answer this question at m.socrative.com now (room 9382)

1) Explain how the use of chemical fertilisers lead to soils having an imbalance of nutrients

Things to explore if you're done:

http://livingheritage.org/green-revolution.htm

http://www.youtube.com/watch?v=Lg9-HTtgFOk