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6  problems with intensification
 

6 problems with intensification

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    6  problems with intensification 6 problems with intensification Presentation Transcript

    • geography of food problems due to intensifying food production
    • due to Irrigation
    • due to Irrigation SalinisationNaCl
    • due to Irrigation SalinisationNaCl Waterlogging
    • due to Irrigation due to Chemicals SalinisationNaCl Waterlogging
    • due to Irrigation due to Chemicals SalinisationNaCl Waterlogging Imbalance of soil nutrients
    • due to Irrigation due to Chemicals SalinisationNaCl Waterlogging Imbalance of soil nutrients Euthrophication
    • due to Irrigation due to Chemicals SalinisationNaCl Waterlogging Imbalance of soil nutrients Water Pollution Euthrophication
    • due to Irrigation due to Chemicals SalinisationNaCl Waterlogging Imbalance of soil nutrients Water Pollution Euthrophication How to remember it better
    • due to Irrigation due to Chemicals SalinisationNaCl Waterlogging Imbalance of soil nutrients Water Pollution Euthrophication tating How to remember it better
    • due to Irrigation due to Chemicals SalinisationNaCl Waterlogging Imbalance of soil nutrients Water Pollution Euthrophication ty tating How to remember it better
    • due to Irrigation due to Chemicals SalinisationNaCl Waterlogging Imbalance of soil nutrients Water Pollution Euthrophication ty tating How to remember it better
    • due to Irrigation due to Chemicals SalinisationNaCl Waterlogging Imbalance of soil nutrients Water Pollution Euthrophication ty tating ly How to remember it better
    • due to Irrigation due to Chemicals SalinisationNaCl Waterlogging Imbalance of soil nutrients Water Pollution Euthrophication ty tating ly How to remember it better
    • due to Irrigation due to Chemicals SalinisationNaCl Waterlogging Imbalance of soil nutrients Water Pollution Euthrophication ty EKY tating ly How to remember it better
    • due to Irrigation due to Chemicals SalinisationNaCl Waterlogging Imbalance of soil nutrients Water Pollution Euthrophication ty EKY tating ly How to remember it better
    • due to Irrigation due to Chemicals SalinisationNaCl Waterlogging Imbalance of 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 Irrigation due to Chemicals SalinisationNaCl Waterlogging Imbalance of soil nutrients Water Pollution Euthrophication
    • due to Irrigation due to Chemicals SalinisationNaCl Waterlogging Imbalance of soil nutrients Water Pollution Euthrophication
    • due to Chemicals Imbalance of 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 Chemicals Imbalance of soil nutrients Water Pollution Euthrophication
    • humus = black stuff in soil
    • humus = decomposed organic material (plants, animals etc.)
    • humus = provides a variety of nutrients in soil humus
    • humus = provides a variety of nutrients in soil humus
    • humus = provides a variety of nutrients in soil humus
    • soil with humus soil without humus
    • humus = provides a variety of 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 Irrigation due to Chemicals SalinisationNaCl Waterlogging
    • due to Irrigation due to Chemicals SalinisationNaCl Waterlogging Imbalance of soil nutrients
    • due to Irrigation due to Chemicals SalinisationNaCl Waterlogging Imbalance of soil nutrients Euthrophication
    • due to Irrigation due to Chemicals SalinisationNaCl Waterlogging Imbalance of 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