Intensifying food production through irrigation and chemical fertilizers has led to several environmental problems. Irrigation has caused salinization of soils as water carries salts inland but leaves them after drying, accumulation of salts over time prevents crop growth. It has also led to waterlogging as soils get saturated. Chemical fertilizers have imbalanced soil nutrients as they only replace nitrogen and phosphorus but plants need variety, excess fertilizers also pollute water sources by encouraging algal growth.

1. geography of
food
problems due to
intensifying food
production

3. due to
Irrigation

4. due to
Irrigation
SalinisationNaCl

5. due to
Irrigation
SalinisationNaCl
Waterlogging

6. due to
Irrigation
due to
Chemicals
SalinisationNaCl
Waterlogging

7. due to
Irrigation
due to
Chemicals
SalinisationNaCl
Waterlogging
Imbalance
of soil nutrients

8. due to
Irrigation
due to
Chemicals
SalinisationNaCl
Waterlogging
Imbalance
of soil nutrients
Euthrophication

9. due to
Irrigation
due to
Chemicals
SalinisationNaCl
Waterlogging
Imbalance
of soil nutrients
Water Pollution
Euthrophication

10. due to
Irrigation
due to
Chemicals
SalinisationNaCl
Waterlogging
Imbalance
of soil nutrients
Water Pollution
Euthrophication
How to remember it better

11. due to
Irrigation
due to
Chemicals
SalinisationNaCl
Waterlogging
Imbalance
of soil nutrients
Water Pollution
Euthrophication
tating
How to remember it better

12. due to
Irrigation
due to
Chemicals
SalinisationNaCl
Waterlogging
Imbalance
of soil nutrients
Water Pollution
Euthrophication
ty
tating
How to remember it better

13. due to
Irrigation
due to
Chemicals
SalinisationNaCl
Waterlogging
Imbalance
of soil nutrients
Water Pollution
Euthrophication
ty
tating
How to remember it better

14. due to
Irrigation
due to
Chemicals
SalinisationNaCl
Waterlogging
Imbalance
of soil nutrients
Water Pollution
Euthrophication
ty
tating ly
How to remember it better

15. due to
Irrigation
due to
Chemicals
SalinisationNaCl
Waterlogging
Imbalance
of soil nutrients
Water Pollution
Euthrophication
ty
tating ly
How to remember it better

16. due to
Irrigation
due to
Chemicals
SalinisationNaCl
Waterlogging
Imbalance
of soil nutrients
Water Pollution
Euthrophication
ty
EKY
tating ly
How to remember it better

17. due to
Irrigation
due to
Chemicals
SalinisationNaCl
Waterlogging
Imbalance
of soil nutrients
Water Pollution
Euthrophication
ty
EKY
tating ly
How to remember it better

18. due to
Irrigation
due to
Chemicals
SalinisationNaCl
Waterlogging
Imbalance
of soil nutrients
Water Pollution
Euthrophication

19. due to
Irrigation
SalinisationNaCl
Waterlogging

20. Water from irrigation has salts
Crops

21. Water from irrigation has salts
Crops

22. Water from irrigation has salts
Crops

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

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

25. More irrigated water = more salts brought in

26. More irrigated water = more salts brought in

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

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

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

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

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

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

33. due to
Irrigation
SalinisationNaCl
Waterlogging

34. due to
Irrigation
SalinisationNaCl
Waterlogging = Soil has too much water

36. due to
Irrigation
SalinisationNaCl
Waterlogging = Soil has too much water

37. due to
Irrigation
SalinisationNaCl
Waterlogging = Soil has too much water
Not enough air in soil
for crops to grow

38. due to
Irrigation
due to
Chemicals
SalinisationNaCl
Waterlogging
Imbalance
of soil nutrients
Water Pollution
Euthrophication

39. due to
Irrigation
due to
Chemicals
SalinisationNaCl
Waterlogging
Imbalance
of soil nutrients
Water Pollution
Euthrophication

40. due to
Chemicals
Imbalance
of soil nutrients
Water Pollution
Euthrophication

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

42. 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

43. Excessive algae

44. Excessive algae

45. Excessive algae

46. 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

47. 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

48. 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.

49. due to
Chemicals
Imbalance
of soil nutrients
Water Pollution
Euthrophication

50. humus
=
black stuff in soil

51. humus
=
decomposed organic
material
(plants, animals etc.)

52. humus
=
provides a variety
of nutrients in soil
humus

53. humus
=
provides a variety
of nutrients in soil
humus

54. humus
=
provides a variety
of nutrients in soil
humus

55. soil with humus soil without
humus

56. humus
=
provides a variety
of nutrients in soil

57. plants absorb a
variety of
nutrients

58. plants absorb a
variety of
nutrients

59. plants absorb a
variety of
nutrients

60. but chemical fertilisers only
replace Nitrogen and Phosphorus

61. but chemical fertilisers only
replace Nitrogen and Phosphorus

62. N
N
but chemical fertilisers only
replace Nitrogen and Phosphorus

63. N
N
P
P
but chemical fertilisers only
replace Nitrogen and Phosphorus

64. N
N
P
P

65. N
N
P
P

66. N
N
P
P
plants absorb a
variety of
nutrients

67. N
N
P
P
plants absorb a
variety of
nutrients

68. N
N
P
P
plants absorb a
variety of
nutrients

69. N
N
P
P
plants absorb a
variety of
nutrients

70. N
N
P
P
Soil left with a lot
of Nitrogen and
Phosphorus, but
not other
nutrients.

71. N
N
P
P
Soil left with a lot
of Nitrogen and
Phosphorus, but
not other
nutrients.

72. N
N
P
P
Soil left with a lot
of Nitrogen and
Phosphorus, but
not other
nutrients.

73. N
N
P
P
nutrients in soil
becomes
imbalanced

74. N
N
P
P
nutrients in soil
becomes
imbalanced

75. N
N
P
P
nutrients in soil
becomes
imbalanced

76. before - a variety
of nutrients

77. N
N
P
P
after - only a few
kind of nutrients.

78. problems due to
intensifying food
production

80. due to
Irrigation

81. due to
Irrigation
SalinisationNaCl

82. due to
Irrigation
SalinisationNaCl
Waterlogging

83. due to
Irrigation
due to
Chemicals
SalinisationNaCl
Waterlogging

84. due to
Irrigation
due to
Chemicals
SalinisationNaCl
Waterlogging
Imbalance
of soil nutrients

85. due to
Irrigation
due to
Chemicals
SalinisationNaCl
Waterlogging
Imbalance
of soil nutrients
Euthrophication

86. due to
Irrigation
due to
Chemicals
SalinisationNaCl
Waterlogging
Imbalance
of soil nutrients
Water Pollution
Euthrophication

87. 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