C3 Unit 5 Scientific farming methods

Unit 5 Scientific Farming Methods in China

C3 Food problems

Open Ended

Revision: What are the farming problems in China?

Farming problems in China

1. insufficient arable land & loss of farmland

2. natural hazards

3. shortage of farm labour

--> lower farm production

​What can we do?

Multiple Choice

Which way should we use to increase farm production?

• traditional farming method

• scientific farming method

Group task (group of 4; 15 mins):
-Each group is assigned a farming problem.
-Try to think of a solution using a scientific farming method.
-You may write or draw your solution.
-You may read P.41-53 or search online for some inspiration!
-I'll invite some groups to present their ideas. :)

Major problems

1. Droughts

2. Pests & weeds

3. Extreme weather

4. Infertile soil

5. Short growing season

6. Shortage of farm labour

​Main goal: increase farm production

​1. What is the farming problem in China?
2. Where can you find the problem in China?
2. What is the solution?
3. How can it solve the farming problem? How can we use it in the farm?

​P.52

​P.52

​increasing use of scientific farming methods in China

chemicals

​irrigation system

greenhouse

Categorize

Options (6)

Extreme weather

Pest attack

Weeds

Infertile soil

Water shortages

Short growing season

What farming problems can these scientific farming methods solve?

Irrigation system

Greenhouse

Chemicals

​Genetic engineering

Machines

Categorize

Options (6)

Shortage of farm labour

Water shortages

Extreme weather

Short growing season

Pest attack

Weeds

What farming problems can these scientific farming methods solve?

Genetic engineering

Machines

Machines (P.47)

​Tractor

​Combine harvester

Drone

​examples:

Machines (P.47)

Open Ended

What are the advantages of using farming machines?

Machines - advantages

​（效率）

​(2)

​(1)

​Farming problem: shortage of farming labour

Machines - disadvantages

​3 steps

​burning

Machines

Multiple Select

What farming problems can be solved by using machines?

• water shortage

• shortage of farmers

• pest

• limited arable land

Multiple Select

What are the advantages/ pros of using machines in farm?

• improve faming efficiency

• farm work can be done quickly

• reduce greenhouse gases

• solve shortage of farmers

Reorder

Reorder the negative impacts when we use machines in a farm.

• combustion of fossil fuels

• release of greenhouse gases

• intensifying greenhouse effect

• causing global warming

1

2

3

4

• 1
• 2
• 3
• 4

Multiple Select

What environmental conditions （環境條件）are controlled in greenhouse?

• sunlight

• water supply

• air temperature

• humidity

• wind speed

Greenhouse (P.48)

​5 environmental conditions

​Adv (1)

Greenhouse - advantages

​​(4)

​​Adv (2)

​​(6)

​​(5)

​-> (3) increase arable land

​P.48

​P.49

Multiple Select

What are the advantages of using greenhouse?

• growing season becomes longer

• solve shortage of farmers

• prevent pest attack

• farmers in northwest China can grow different types of crops (e.g. vegetables and fruits)

• improve farming efficiency

Greenhouse - disadvantages

-> cause global warming

​(1)

​(2) similar to using machines

combustion = burning

Greenhouses

Word Cloud

BK P.50-51:

What are genetically modified (GM) crops?

​P.50

Genetically modified
(GM) crops

Genetic engineering - pros

​P.50-51

Multiple Select

Which of the following farming problems in China can be solved by using temperature-tolerant GM crops?

• extreme cold weather

• insufficient arable land

• water shortages

• pest

Genetic engineering - pros

​P.50

Multiple Select

Which of the following farming problems in China can be solved by using drought-resistant GM crops?

• pollution

• insufficient arable land

• water shortages

• pest

Genetic engineering - pros

overcome
pest attack

​P.50-51

Genetic engineering - pros

​P.51

Multiple Choice

Which of the following farming problems in China can be solved by using pest-resistant GM crops?

• pollution

• insufficient arable land

• water shortages

• pest

Poll

Pests are killed when we grow pest-resistant crops.

Are they the only victim?

• yes

• no

Genetic engineering - cons

​P.51

Genetic engineering - cons

​P.51

Poll

Do you think it's safe to consume GM crops?

• yes

• no

Genetic engineering - cons

​P.51

Multiple Choice

GM crops help to increase the biodiversity.

• True

• False

Multiple Choice

GM crops can resist ____, so that crops can grow with less water.

• drought
• flood

• pest

• disease

Multiple Choice

GM crops may harm human’s _____ .

• farm

• home

• health

• wealth

Genetic engineering

Irrigation system
(灌溉系統)

sprinkler irrigation

Home

Open in new tab

Copy link

​P.42

Multiple Select

Which parts of China have low rainfall?

• South China

• North China

• Northwest China

• Southeast China

• East China

​

​arable land

​(1)

​(2)

(North and Northwest China)

​P.42

Multiple Select

What are the pros of using irrigation systems in China?

• increase water supply in dry areas

• increase farming area/ arable land

• provide a stable water supply

• increase crop yields

• use less water

Multiple Select

Where can we get water for irrigation?

• river

• lake

• surface water

• groundwater

​P.42

Excessive irrigation

​river flowing direction

downstream

​upstream

divert too much river water

​P.43

Excessive irrigation

​P.43

​地下水位

Excessive irrigation

Sources of irrigation water:
1. Surface water
2. Groundwater

​normally

/recovered

​下沉

​Result: P.43
- water table (地下水位) will drop
- land may subside (塌陷) and collapse

Multiple Select

What are the negative impacts of overpumping groundwater?

• land subsidence

• lower water table

• more water can be used for farming

• river dries up

Irrigation system

Chemicals (P.44)

commonly used in farming:
1. chemical fertilizers
2. pesticides
3. weedicides/ herbicides (除草劑)

Home

Open in new tab

Copy link

Multiple Select

What are the advantages of using chemical fertilizers?

• make soil fertile

• kill pests

• remove weeds

• increase farm productivity

• increase crop quality

Multiple Select

What are the advantages of using pesticides?

• make soil fertile

• kill pests

• remove weeds

• increase farm productivity

• reduce crop failure

Multiple Select

What are the advantages of using weedicides/ herbicides?

• make soil fertile

• kill pests

• remove weeds

• increase farm productivity

• increase crop quality

Chemicals - cons

memorise according to:
- chemical type
(fertilizers, pesticides, weedicides/ herbicides)
- social aspect (on people)
- environmental aspect (on nature)

P.44-46

P.45

P.45

​(1)

​(2)

​(3)

​(4)

​eutrophication
（富營養化）

P.45

Reorder

Reorder the water pollution caused by the chemical fertilizers.

• chemical fertilizers are washed into river/ lake

• chemical fertilizers provide nutrients for algae

• rapid growth of algae

• algae used up oxygen in river/ lake

• fish/ other living things in river/ lake die

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

​酸度

unsuitable

P.45

P.45

Multiple Choice

Which greenhouse gas is released when we use chemical fertilizer?

• sulphur dioxide

• carbon dioxide

• oxygen

• nitrous oxide

P.45

Poll

If we use pesticides, do we have more or fewer pests in the long run?

• more

• fewer

​(1)

P.46

​super pests!

​​(2)

P.46

Reorder

Reorder the following

• Excessive use of pesticides

• Pests are resistant to the pesticides

• They become super pests!

• More powerful pesticides are needed

• More serious negative impacts on the environment

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

​​(3)

​water pollution

P.46

P.46

Multiple Select

Which of the following are negative impacts of using pesticides on the environment?

• water pollution

• decrease biodiversity

• harm human's health

• increase pest amount in the long run

• more serious impact on the environment when stronger pesticides are used

Multiple Select

Which of the following are negative impacts of using pesticides on the people?

• water pollution

• decrease biodiversity

• harm human's health

• increase pest amount in the long run

• more serious impact on the environment when stronger pesticides are used

​​(1)

​water pollution

​Weedicides/ herbicides

​Weedicides/ herbicides

​Weedicides/ herbicides

​Weedicides/ herbicides

​P.54

​knowledge

Limitations of using scientific farming methods

​HW: BK P.55-56

Categorize

Options (6)

Extreme weather

Pest attack

Weeds

Infertile soil

Water shortages

Short growing season

What farming problems can these scientific farming methods solve?

Irrigation system

Greenhouse

Chemicals

Categorize

Options (6)

Shortage of farm labour

Water shortages

Extreme weather

Short growing season

Pest attack

Weeds

What farming problems can these scientific farming methods solve?

Genetic engineering

Machines