Physical Environmental Variables (AQA A-Level Geography): Flashcards
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Key physical factors for agricultural success
Key physical factors for agricultural success
Climate and soil conditions
Global agricultural output annual growth rates (1961-2016)
Global agricultural output annual growth rates (1961-2016)
Approximately 2.2% to 2.9%
Main growth drivers in early decades (1961-1980)
Main growth drivers in early decades (1961-1980)
Expanding agricultural land and developing irrigation
Dominant driver of agricultural growth (2001-2016)
Dominant driver of agricultural growth (2001-2016)
Improvements in total factor productivity
Forecast annual agricultural growth rate to 2050
Forecast annual agricultural growth rate to 2050
Around 2.3% annually
Definition of limiting factors in agriculture
Definition of limiting factors in agriculture
Environmental conditions restricting where crops grow economically
Optimum conditions zone (Optima & Limits Model)
Optimum conditions zone (Optima & Limits Model)
Maximum productivity, lowest costs, highest yields
Transition zone characteristics (Optima & Limits Model)
Transition zone characteristics (Optima & Limits Model)
Costs increase, yields decrease as conditions deviate
Limit of production zone characteristics
Limit of production zone characteristics
Conditions too adverse for economic crop production
Methods to adapt crops to wider environmental ranges
Methods to adapt crops to wider environmental ranges
Hybridisation and genetic modification