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time limit:t < 10 min - Developed by: isabel - Developed on: - 6.401 taken

  • 1
    Terracing method is used to increase the amount of arable land.
  • 2
    Shifting cultivation is the only form of subsistence farming.
  • 3
    One method of irrigation is to pump groundwater up using electric pumps.
  • 4
    Through irrigation, crops can get a regular supply of water all year round.
  • 5
    Subsistence farming produce only enough food to feed the family working on it.
  • 6
    In aeroponics, the seedlings are placed in nutrients-enriched solution that promotes plant growth.
  • 7
    Chemical fertilisers are cheap and readily available.
  • 8
    Irrigation is the bringing of water from a water source to the fields through artificial means.
  • 9
    Terracing is an expensive method of increasing the area of arable land.
  • 10
    Wetlands are highly infertile as nutrients are lost through soil erosion.
  • 11
    New varieties of rice produce high yields with little use of pesticides, herbicides and fertilisers.
  • 12
    Fertilisers are also used in the restoration of derelict land.

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