Unit 4: Agriculture - Agricultural Energetics

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  • Agricultural Energetics
    • Intensive Agriculture - high yields achieved using large inputs
      • Artificial fertilisers, pesticides
      • High energy subsidy via fossil fuels
      • Little nutrient recycling
      • Highly mechanised
      • High density animal husbandry
      • Less sustainable
    • Extensive Agriculture - yield is achieved by distributing inputs over large areas (inputs usually low)
      • Would produce a greater overall yield if enough suitable land was available
      • Opposite of intensive agriculture
      • Can still have environmental impacts due to large land use
    • Inputs - labour, money, fuel and fertiliser
    • Productivity = yield/unit area
    • Efficiency = yield/unit input
    • Energy ratio = energy removed/ energy put in

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