Unit 4: Agriculture - Selection of Species for Cultivation

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  • Selection of Species for Cultivation
    • Temperature
      • Temperature range - minimum and maximum temperatures
      • Thermal growing season - time of year warm enough for plant growth
      • Length of frost-free season
    • Wind Velocity
      • Affects storm damage and evaporation rate
      • Cereal crops may be flattened by strong winds
    • Solar Insolation (Light)
      • Affected by latitude, cloud cover, seasonal and daily changes
      • Limiting factors of photosynthes
      • Day length controls growth and flowering in crops and egg laying in poultry
    • Topography
      • Slope and undulations - machinery cannot operate on steep slopes
        • Any sloping fields must be flattened or terraced
      • Aspect - the angle and intensity of sunlight crops receive affected
      • Frost pockets - cold air can collect in valley bottoms and increase frost damage risk
    • Altitude
      • Increasing altitude reduces temperature and increases precipitation
    • Pest Problems
      • Reduces crop and livestock productivity
    • Edaphic Factors (Soil Fertility)
      • Nutrient availability
      • Soil structure and texture
      • Soil pH
      • Soil depth
      • Biota
  • High altitude = low air pressure - hard for livestock
    • Altitude
      • Increasing altitude reduces temperature and increases precipitation

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