AQA A-Level Agriculture Study Questions

Species Selection and Environmental Factors

Choosing what to grow isn't random - farmers consider market demand, whether the local environment suits their chosen species, and if they can tweak conditions to boost productivity. It's like matching the right plant or animal to the perfect home where it can thrive.

Four key environmental factors determine agricultural success: temperature, light, water availability, and soil fertility. Additional factors like topography, relief, and pests also play crucial roles in determining whether crops will flourish or fail.

The physical landscape matters too. Topography affects everything from how much sunlight plants receive to whether cold air gets trapped in valleys, potentially causing frost damage that could wipe out entire crops.

Quick Tip: Think of environmental factors like ingredients in a recipe - you need the right combination for success!

Temperature and Light Control

Temperature controls the length of the growing season and affects crucial plant processes. Grass might survive cold weather, but it only actually grows above 5°C. Higher temperatures speed up biochemical reactions but also increase water loss through evapotranspiration.

Farmers can control temperature by avoiding frost-prone low-lying areas, using greenhouses, or covering fields with transparent plastic cloth. Livestock need shelter to maintain body temperature and use energy for growth rather than just staying warm.

Light intensity drives photosynthesis, whilst day length affects growth rates. Interestingly, poultry grow best during short days but produce more eggs when days are longer - showing how complex these relationships can be.

Did You Know?: Farmers can extend growing seasons using artificial lighting, essentially tricking plants into thinking it's still summer!

Water Management and Soil Fertility

Water is absolutely essential - it's the solvent in all cells, transports nutrients, maintains cell structure, and enables gas exchange. Without adequate water, plants can't absorb dissolved nutrients or replace what they lose through transpiration.

Smart farmers increase water availability through irrigation, soil mulching to reduce evaporation, and adding organic matter to help soil retain moisture. Earthworms are brilliant allies here, improving water infiltration and reducing runoff.

Soil fertility must be maintained because harvesting removes nutrients that need replacing. This can be achieved through natural processes (like nitrogen fixation by legumes), organic fertilisers, inorganic fertilisers, or even hydroponics - growing crops in nutrient solutions rather than soil.

Each fertiliser type has trade-offs. Organic fertilisers are often local waste products that improve soil structure but release nutrients slowly. Inorganic fertilisers offer precise control and rapid nutrient release but require lots of energy to manufacture and don't improve soil organic matter.

Think About It: Hydroponics eliminates soil-borne diseases and weeds but requires high-tech knowledge and energy inputs!