Post on 12-Jun-2015
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