Food Production Notes

Key Terms and Definitions

• ARABLE: Land that can be used to grow crops.
• YIELD: A measurement of the amount of a crop grown.
• SUSTAINABLE: Using land in such a way that it can still be used in the future.
• MONOCULTURE: Growing only one crop on an area of farmland.
• GREEN REVOLUTION: A period when agriculture improved yield via pesticides, modified seeds, and better management.

Global land use and yields

• Agricultural yields vary widely around the world due to climate, management practices, and crop types.
• Land use for crops: $15 \times 10^{6} \ \text{km}^{2}$ (about 15 million square kilometres).
• Land use for pasture: $32 \times 10^{6} \ \text{km}^{2}$ (about 32 million square kilometres).
• Most land suitable for agriculture is already used for agriculture.
• In the past $50$ years, global food production has increased significantly due to intensification and expansion of farming practices.

Global agricultural extent and context

• Most land suitable for agriculture is already in use; the recent growth in food production has come from intensification and innovation rather than large-scale new land).
• This context underpins the need to understand yields, sustainability, and the interconnections between climate, crops, and farming systems.

Biomes, cropland, and pasture (map-based comparison)

• Biomes most used for cropland: e.g., temperate grasslands, temperate forests, and some tropical zones depending on management.
• Biomes most used for pasture: extensive grassland biomes (savannas, steppes) and grazing-friendly ecosystems.
• Biomes that produce the least food often include harsh deserts and tundra with limited growing capacity.
• Interconnection: climate and soil shape which biomes can be converted to cropland or pasture; examples include:
  • Semi-arid plains converted to cropland with irrigation (e.g., parts of the Sahel or Central Asia).
  • Tropical forests cleared for cropland or pasture, with sustainability trade-offs.

World food staples and energy contribution

• Most staple foods are cereals: $\text{wheat}, \; \text{barley}, \; \text{rye}, \; \text{oats}, \; \text{maize}, \; \text{rice}$; or root vegetables: $\text{potatoes}, \; \text{yams}, \; \text{taro}, \; \text{cassava}$.
• Rice, maize, and wheat provide about $0.60$ of the world’s food energy intake; roughly $4 \times 10^{9}$ people rely on them as staple foods.
• Other staples include legumes (e.g., soybeans) and sago; fruits like breadfruit and plantains; as well as fish.

Factors influencing crop production (overview)

• Environmental factors: climate, soils, rainfall, temperature, drought risk, flood risk, pests, and diseases.
• Economic factors: subsidies, markets, prices, access to credit, transport costs, and policy frameworks.
• Technological factors: fertilisers, irrigation, seeds, mechanisation, biotechnology, and adoption of new farming practices.

Australia context: farming and agriculture

• Modern Australian farming is largely commercial and market-oriented for local and global markets.
• Farm types vary from single-crop systems (e.g., sugar cane) to mixed farms (cereal grains plus livestock).
• Large corporates often manage farms with an agribusiness approach.
• Discussion prompts: What questions arise from the data on Australian farming (e.g., sustainability, land use change, economic viability, and social impact)?

Australia: farming diversity and location

• Australia hosts a wide range of agricultural types across all biomes present in the country.
• The location of farms reflects climate, water availability, soil quality, infrastructure, and market access.
• Examining shifts in land use over time helps reveal patterns of intensification and specialization.

Changes in agricultural land use in Australia

• Examine patterns of land use change to describe how farming has evolved over time (e.g., expansion into new biomes, intensification of existing croplands, or shifts from pasture to crop production).
• Draft statement example: Describe whether farming has become more specialized, more capital-intensive, or more export-focused, and identify drivers (climate, policy, investment, technology).

Collaborative activity: Australian farming products

• Each group documents a product (e.g., NUTS - almonds; LIVESTOCK - sheep).
• Produce a slide deck including:
  • Product overview with production-stage images.
  • Typical farm locations and a map.
  • Environmental, economic, and technological factors influencing farming in these areas.
  • An assessment of sustainability for this farming type in Australia.
  • Sources with URLs.
• Example product groups: WHEAT, SUGAR CANE, COTTON, FRUIT, NUTS, LIVESTOCK.

Case study 1: Cacao (cocoa)

• Chocolate is made from cacao beans; cacao farming has a 4000-year history.
• Global cocoa bean farming involves around $6 \times 10^{6}$ farmers, supporting $[4.0 \times 10^{7}, 5.0 \times 10^{7}]$ people in total.
• Demand has grown at about $3\%$ per year over the last century.
• Cocoa is traded on the world market; prices fluctuate daily due to supply and demand; adverse weather or disease reduces supply.
• Cacao trees are native to the Amazon Basin and surrounding tropical regions; many wild varieties still grow in forests.
• Cacao is typically grown in agroforestry systems that support biodiversity and income diversification for families.
• Farming is labour-intensive: much of the work is done by hand; flowering is often hand-pollinated; defective pods are removed to push energy into good pods.
• Cultural practices:
  • In Oaxaca, Mexico, curanderos (traditional healers) use chocolate drinks to treat bronchitis and plant cacao in the earth to ward off evil forces; chocolate is used to protect children from stings.
  • In Australia and many other countries, chocolate is tied to cultural events (e.g., Easter, Christmas).
• Sustainability concerns: pests, fungal infections, climate change, and farmer access to fertilisers and inputs affect yields; global consumption is rising, especially for darker, higher-cocoa varieties.
• Activity: Create an infographic highlighting key sustainability challenges and potential practices for cocoa farming.

Case study 1: Cacao – additional notes

• Labour: cacao is one of the most labour-intensive crops; contact with beans and pods is frequent and intensive.
• Economic concepts: price volatility, supply risk, and income diversity are critical for farmers relying on cacao.
• Environmental considerations: shade-grown systems are common to support biodiversity but may limit yields without improved inputs.

Case study 2: Rice

• Rice is the seed of a semi-aquatic grass; cultivated in warm climates across more than 100 countries; a staple for more than half of the world’s population.
• Global importance: rice influences livelihoods and economies for billions of people.
• Key sources: view data and maps from Our World in Data for regional production and trends.

Geography of cacao and rice: location and climate (regional notes)

• Cacao: native to tropical Americas; thrives in humid tropical climates with regular rainfall and a short dry season; temperatures around 21^\circC to 23^\circC; annual rainfall of $1000-2500\ \text{mm}$; well-drained soils with moisture-holding capacity; shade-grown under trees like palms or rubber plants; typical height $6-7\ \text{m}$ (though trees can reach $12\ \text{m}$); rapid growth: flowering/fruiting in 2–3 years after planting.
• Rice: can be grown in a wide range of environments (hot/cool, wet/dry, sea level to high altitudes); ideal in SE Asia: high temperatures, abundant water, flat land, fertile soil.
• South-East Asia irrigation: about $45\%$ of rice area is irrigated; major irrigated zones include Indonesia, Vietnam, the Philippines, and Thailand.

Technology and management in rice farming

• Biotechnology has produced rice varieties resistant to pests; genetic engineering has yielded herbicide resistance, disease resistance, salt/drought tolerance, improved grain quality, and photosynthetic efficiency.
• In the Philippines, cross-breeding (not genetic engineering) produced a strain that tolerates phosphorus-poor soils.

Environmental issues and climate change impacts on rice

• Rising temperatures associated with global warming are linked to declines in rice production in Asia; FAO notes a $10\%-20\%$ drop in yields in six major producers (China, India, Indonesia, Philippines, Thailand, Vietnam) over the past 25 years.
• If adaptive methods and new strains are not developed, rice production may decline further in the coming decades.
• Rice farming contributes to greenhouse gas emissions: rice is responsible for about $0.10$ of global methane emissions; in Southeast Asia, rice cultivation accounts for as much as $0.25-0.33$ of the region's methane emissions.

Impacts on potential yield: key constraints in rice

• Poor production management
• Weeds (biotic factor)
• Pests and diseases (biotic factors)
• Inadequate land formation and irrigation water
• Inadequate drainage leading to salinity and alkalinity buildup

Regional and global patterns of rice production (patterns and data cues)

• Regions with large production include tropical and subtropical areas (India, China, Indonesia, Vietnam, Thailand, etc.).
• Global distribution of consumption vs production varies by country; top consuming and top producing countries show differing patterns, reflecting domestic diets and trade.
• Use a choropleth approach to describe global rice production: darker shades indicate higher production; lighter shades indicate lower production.
• PQE method to describe patterns: P (Pattern), Q (Question), E (Evidence).

Top rice-producing countries (consumption vs production)

• Group activity prompts include ranking the top 10 producers:
  1. China
  2. India
  3. Bangladesh
  4. Indonesia
  5. Vietnam
  6. Philippines
  7. Thailand
  8. Myanmar (Burma)
  9. Japan
  10. Pakistan
• Top 10 rice-consuming countries (illustrative, 2020/21–22/23):
  • China: $153.683 \text{ million tons}$ consumption
  • India: $109.166 \text{ million tons}$ consumption
  • Bangladesh: $36.733 \text{ million tons}$ consumption
  • Indonesia: $35.367 \text{ million tons}$ consumption
  • Vietnam: $21.450 \text{ million tons}$ consumption
  • Philippines: $15.400 \text{ million tons}$ consumption
  • Thailand: $12.700 \text{ million tons}$ consumption
  • Myanmar: $10.367 \text{ million tons}$ consumption
  • Japan: $8.183 \text{ million tons}$ consumption
  • Nigeria: $7.333 \text{ million tons}$ consumption
• Top 10 rice-producing countries (production):
  • China: $147.691 \text{ million tons}$
  • India: $125.038 \text{ million tons}$
  • Bangladesh: $35.511 \text{ million tons}$
  • Indonesia: $34.360 \text{ million tons}$
  • Vietnam: $27.099 \text{ million tons}$
  • Thailand: $19.529 \text{ million tons}$
  • Burma: $12.530 \text{ million tons}$
  • Philippines: $12.249 \text{ million tons}$
  • Japan: $7.591 \text{ million tons}$
  • Pakistan: $7.530 \text{ million tons}$

Climate, topography, and land use for rice

• Climate and topography: rice thrives where conditions are hot and wet; high temperatures, abundant water, flat land, and fertile soils support ideal growth; regions range from sea level to high altitudes in the Himalayas.
• Example visual: Murrumbidgee irrigation area (Australia) shows rice bays as an illustrative landscape in a non-traditional rice region.
• Geography and trade influence where rice is grown, consumed, and exported.

Irrigation and field management in rice

• Traditional paddy-field irrigation involves flooding fields for part of the year; fields are small with bunds to retain water.
• Seedlings are started in seedbeds and then transplanted into flooded fields.
• Water is transported via canals; irrigation is critical to achieve multiple crops per year in favorable climates.
• In SE Asia, approximately $45\%$ of rice area is irrigated, with the largest areas in Indonesia, Vietnam, the Philippines, and Thailand.

Technology in rice farming

• Biotechnology has produced pest-resistant rice and tools for improving resilience: herbicide resistance, disease resistance, salt tolerance, drought tolerance, improved grain quality, and photosynthetic efficiency.
• In the Philippines, cross-breeding has yielded varieties that perform well in phosphorus-poor soils without resorting to genetic engineering.

Environmental issues and climate change impacts on rice (summary)

• Global warming and rising temperatures threaten rice yields in Asia (the world’s largest rice-producing region).
• FAO findings indicate a yield decline of $10\%-20\%$ in six major producers over the past 25 years due to higher temperatures.
• Rice farming pressurizes climate through methane (CH4) emissions; regional methane shares are high in SE Asia (estimated at $0.25-0.33$ of regional methane emissions).

Practical implications and future directions

• Population growth and dietary shifts (e.g., increased demand for rice in populous regions) will influence global food security and trading patterns.
• Breeding programs and climate-smart agriculture will be key to maintaining yields while reducing environmental impact.
• Policy measures (infrastructure, irrigation investment, subsidies, and market access) will shape farmer viability and rural livelihoods.

Activity prompts and reflection

• Key question: What is the interconnection between population growth and food production? Reflect on how population dynamics, dietary patterns, and technological change interact to determine global food security.
• Consider multiple scales: household, farm, regional, national, and global.

Summary: interconnections and takeaways

• Food production depends on a complex system of climate, land use, technology, economics, and culture.
• Major staples (rice, maize, wheat) dominate energy intake; regional patterns in production and consumption reflect climate, culture, and trade.
• Case studies (cacao and rice) illustrate how environmental constraints, labor dynamics, technology, and market forces shape farming systems and livelihoods.
• Sustainability requires balancing yield gains with ecological integrity, equitable income, and resilience to climate change.

Notation references and formulas used in this notes

• Land areas:
  • Cropland area: $A_{c} = 15 \times 10^{6} \ \text{km}^2$
  • Pasture area: $A_{p} = 32 \times 10^{6} \ \text{km}^2$
• Global staple energy share: $0.60$ of energy intake from rice, maize, and wheat.
• Population dependencies: cacao livelihoods depend on $6 \times 10^{6}$ farmers and $[4.0 \times 10^{7}, 5.0 \times 10^{7}]$ people.
• Cocoa demand growth: $3\% = 0.03\text{ per year}$
• Cocoa agroforestry and shade: typical rotational yield dynamics depend on shade management (qualitative).
• Rice irrigation share: $0.45$ (45\%) of SE Asia rice area irrigated.
• Rice temperature range for growth: $21^{\circ}\text{C} \le T \le 23^{\circ}\text{C}$
• Rainfall range for cacao: $1000 \le R \le 2500 \ \text{mm year}^{-1}$
• Methane share from rice: global $0.10$ of methane; SE Asia share $0.25 \le \text{CH}_4\text{ share} \le 0.33$
• Typical yield constraints: list of factors (management, weeds, pests, irrigation, drainage).