11: Agriculture

Question 1

What are the factors that affect agriculture?

Answer 1

1) Temperature
2) Light
3) Water
4) Soil fertility
5) Aeration
6) Salinity
7) pH
8) C02 concentration
9) Topography
10) Wind velocity

Question 2

Why is temperature an important factor to control in agriculture?

Answer 2

• Length of thermal growing season
• Frost damage
• Evaporation
• Biochemical reactions
• thermoregulation

Question 3

How can temperature be controlled?

Answer 3

1) Location
- avoid low lying areas
- south facing slopes

2) Greenhouses
- paraffin heaters

3) Burning fuel in orchards

4) Woven plastic cloth
- Traps warm air close to the ground to protect seedlings

5) Shelter

Question 4

What is the difference between macro and micro nutrients?

Answer 4

Macro nutrients are those that plants need in large amounts, whereas micronutrients are those needed in small amounts.

Question 5

What are the 3 common macronutrients?

Answer 5

Iron
Zinc
Copper

Question 6

Name three examples of micronutrients

Answer 6

Potassium ions, phosphate ions and nitrate ions