Every time you buy a bag of everyday carrots for just , you are seeing the results of intensive agriculture. Intensive farming (often run by large corporate agribusiness companies) aims to produce the maximum possible yield from a piece of land.
This is achieved through high capital investment, mechanisation, and the heavy use of agrochemicals like synthetic fertilisers and pesticides. Farmers often practice monoculture, which involves growing a single crop species over a vast area.
To accommodate large-scale machinery, natural features like hedgerows are frequently removed. While conventional production is significantly cheaper and vital for global food security, intense mechanisation is linked to a steep decline in rural farming jobs.
A major issue with synthetic fertilisers is leaching, where rainwater washes nutrients out of the soil and into nearby waterways. This triggers a destructive process called eutrophication:
Biodiversity also suffers drastically. Removing hedgerows destroys vital wildlife corridors, contributing to a drop in some UK farmland bird populations between the and . Furthermore, heavy pesticide use is linked to colony collapse disorder in bees, threatening crop pollination.
Intensive monocultures also lack resilience. Because all plants are genetically similar and rely on artificial inputs, the system is vulnerable to shocks. During the UK drought, cereal production plummeted by because the single-crop system could not adapt.
Organic farming completely avoids synthetic inputs, relying instead on natural ecosystem management. Farmers use crop rotation and natural fertilisers (like manure or compost) to maintain soil fertility and prevent exhaustion.
Instead of chemical pesticides, organic farms use biological control, such as releasing ladybirds to eat aphids. Animals are kept free-range, and antibiotics are strictly limited to treating sick animals rather than being used preventatively.
Case Study - Riverford Organic Farmers: Based in Devon, this UK organic supplier delivers up to veg boxes a week. It operates as an employee-owned trust, providing fair wages and sharing profits. Environmentally, its organic status supports more wildlife than the average intensive farm.
To accurately assess sustainability, we must balance environmental care against economic realities and human needs.
A major drawback of organic farming is the yield gap. Organic yields are typically lower than intensive methods, making organic food more expensive for consumers. This lower yield also complicates the carbon footprint of our food. While organic farms emit fewer greenhouse gases per hectare, the emissions per kilogram of food can actually be higher. For example, Italian organic tomatoes can have a higher carbon footprint per kilogram than intensive ones because the lower crop volume offsets the savings from avoiding chemicals.
Conclusion on Sustainability: Ultimately, while organic farming offers a more sustainable environmental and social model (as seen with Riverford), it currently lacks the scale and affordability required to ensure global food security for a growing population. Conversely, intensive farming provides the high volumes needed for food security but risks long-term environmental collapse. A sustainable future likely requires a hybrid approach, integrating organic soil management into intensive systems to protect biodiversity without sacrificing yield.
A farmer currently produces of intensive wheat per hectare. If they convert their farm to an organic system, calculate the expected new yield.
Step 1: Identify the baseline yield difference.
Step 2: Set up the formula.
Step 3: Substitute the values and calculate.
Imagine a plant that can produce its own pest repellent or survive being sprayed with weedkiller. Genetically Modified (GM) Crops have their DNA altered using genes from other species to enhance these traits.
This rapid technological development supports Boserup theory, which suggests that population growth will stimulate human innovation to secure our food supply. GM technology boosts food security through higher yields and biofortification.
For instance, Golden Rice (GR2) provides up to of a child's daily Vitamin A requirement in the Philippines from just a portion, preventing blindness. Meanwhile, Bt Cotton produces toxins lethal to pests, reducing harmful insecticide use by up to . However, environmentalists worry about genes spreading to wild plants, and farmers can become economically dependent on large biotechnology corporations for expensive seeds.
Hydroponics involves growing plants in a mineral nutrient solution instead of soil, often using an inert medium like Rockwool. When these systems are stacked in layers to save space, it is known as vertical farming.
Plants grow times as fast because they do not have to expend energy searching for nutrients, yielding up to times more food per square metre than traditional soil farming. The closed-loop system also uses less water.
Case Study - Thanet Earth: This site in Kent supplies of the UK's tomatoes. It uses Combined Heat and Power (CHP) systems to generate electricity, using the waste heat and waste to enrich the greenhouses and boost photosynthesis. However, the main limitation is the energy required; a hydroponic lettuce produces per kg, compared to for imported intensive lettuce.
Technological developments like GM crops and hydroponics are highly efficacious for increasing global and national food security. By allowing year-round production in climate-controlled environments (Thanet Earth) or engineering crops to survive in harsh conditions (GM), these innovations directly address the challenges of climate change and a rising population. However, their efficacy is limited by high entry costs and energy demands. For these technologies to be truly successful in the long term, hydroponics must transition to renewable energy sources, and GM technology must be made accessible to small-scale farmers in developing nations.
Students often assume organic farming always has a lower carbon footprint than intensive farming, but because organic yields are lower, the footprint per kilogram of food can actually be higher.
In 'Discuss' questions, examiners expect you to explicitly balance economic benefits (like food security and cheap prices) against environmental damage (like eutrophication) and provide a concluding judgment.
When explaining biodiversity loss in intensive farming, always specifically mention the 'removal of hedgerows' as this directly destroys vital wildlife corridors.
Use specific case study details to access Level 3 marks, such as referencing Golden Rice in the Philippines for biofortification or Thanet Earth in Kent for hydroponics.
If evaluating hydroponics, explicitly refer to it as a 'technological development' and note that its sustainability heavily depends on whether the energy source is renewable.
Intensive farming
A farming system aiming to produce the maximum possible yield from a piece of land through high inputs of capital, labour, and agrochemicals.
Agribusiness
Large-scale commercial farming run as a business, integrating multiple stages of food production from farm to fork.
Agrochemicals
Any chemical used in agriculture, including synthetic herbicides, pesticides, and fertilisers.
Monoculture
The agricultural practice of growing a single crop species in a large field or system at one time.
Leaching
The process by which nutrients are washed out of the soil by rainwater into rivers and lakes.
Eutrophication
The process by which a body of water becomes overly enriched with nutrients, leading to plentiful algae growth and depletion of oxygen.
Nutrient Loading
The introduction of excess nutrients, like nitrates from fertilisers, into an aquatic ecosystem.
Light Blockage
A stage in eutrophication where surface algae prevent sunlight from reaching plants deeper in the water.
Decomposition
The biological process where bacteria break down organic matter (like dead aquatic plants).
Anoxia
A condition where a body of water has a severe lack of dissolved oxygen, often resulting in the death of aquatic life.
Organic farming
A method of crop and livestock production that avoids synthetic inputs and relies on natural ecosystem management.
Crop rotation
The practice of growing a series of different types of crops in the same area across a sequence of seasons to maintain soil fertility.
Sustainability
Meeting the food needs of the present without compromising the ability of future generations to meet their own needs.
Yield gap
The difference between the actual yield of a crop (such as organic) and the maximum possible yield using intensive methods.
Carbon footprint
The total amount of greenhouse gases generated by an activity, measured in units of carbon dioxide equivalent (CO2e).
Genetically Modified (GM) Crops
Crops with DNA altered using genes from other species to enhance productivity, nutritional value, or resistance.
Boserup theory
The optimistic view that population growth stimulates technological innovation to increase food supply.
Food security
When all people, at all times, have physical, social, and economic access to sufficient, safe, and nutritious food.
Biofortification
The process of increasing the nutritional value of crops through biotechnology, such as adding vitamins to rice.
Hydroponics
Growing plants without soil, using mineral nutrient solutions in water.
Rockwool
An inert growing medium made from spun basalt rock used frequently in soil-less farming systems.
Vertical farming
Stacking hydroponic systems in layers to maximize crop yield per square metre in urban or indoor environments.
Put your knowledge into practice — try past paper questions for Geography B
Intensive farming
A farming system aiming to produce the maximum possible yield from a piece of land through high inputs of capital, labour, and agrochemicals.
Agribusiness
Large-scale commercial farming run as a business, integrating multiple stages of food production from farm to fork.
Agrochemicals
Any chemical used in agriculture, including synthetic herbicides, pesticides, and fertilisers.
Monoculture
The agricultural practice of growing a single crop species in a large field or system at one time.
Leaching
The process by which nutrients are washed out of the soil by rainwater into rivers and lakes.
Eutrophication
The process by which a body of water becomes overly enriched with nutrients, leading to plentiful algae growth and depletion of oxygen.
Nutrient Loading
The introduction of excess nutrients, like nitrates from fertilisers, into an aquatic ecosystem.
Light Blockage
A stage in eutrophication where surface algae prevent sunlight from reaching plants deeper in the water.
Decomposition
The biological process where bacteria break down organic matter (like dead aquatic plants).
Anoxia
A condition where a body of water has a severe lack of dissolved oxygen, often resulting in the death of aquatic life.
Organic farming
A method of crop and livestock production that avoids synthetic inputs and relies on natural ecosystem management.
Crop rotation
The practice of growing a series of different types of crops in the same area across a sequence of seasons to maintain soil fertility.
Sustainability
Meeting the food needs of the present without compromising the ability of future generations to meet their own needs.
Yield gap
The difference between the actual yield of a crop (such as organic) and the maximum possible yield using intensive methods.
Carbon footprint
The total amount of greenhouse gases generated by an activity, measured in units of carbon dioxide equivalent (CO2e).
Genetically Modified (GM) Crops
Crops with DNA altered using genes from other species to enhance productivity, nutritional value, or resistance.
Boserup theory
The optimistic view that population growth stimulates technological innovation to increase food supply.
Food security
When all people, at all times, have physical, social, and economic access to sufficient, safe, and nutritious food.
Biofortification
The process of increasing the nutritional value of crops through biotechnology, such as adding vitamins to rice.
Hydroponics
Growing plants without soil, using mineral nutrient solutions in water.
Rockwool
An inert growing medium made from spun basalt rock used frequently in soil-less farming systems.
Vertical farming
Stacking hydroponic systems in layers to maximize crop yield per square metre in urban or indoor environments.