agriculture
.What is Agriculture?
-Agriculture is how humans change land to grow food and raise animals
-it’s one of the main ways we interact with our environment
Key Factor: Water Access
-crops and animals need freshwater to survive and grow
-farmers often settle near rivers, lakes, or areas with regular rainfall
Ex: The Nile River in Egypt
Key Factor: Soil Quality
-soil nutrients determine what can grow in an area
-different crops need different soil types
Ex: Coffee grows best in volcanic soils
Key Factor: Landforms
-the shape of the land affects how easy it is to farm
-flat land is ideal because it’s easier to work on
Ex: U.S. prairies are perfect for growing wheat
Human Adaptation Irrigation
-irrigation brings water to dry areas
-ancient civilizations built complex irrigation systems
Human Adaptation: Terrace Farming
-involves cutting steps into hillsides to create flat areas
Ex: The Inca in Peru used terraces on mountain slopes
Other Human Adaptations
-deforestation: cleaning forests for farmland
-draining wetlands: removing water from marshy areas
-desertification: poor practices turn land into desert
Geography and Agriculture
-physical geography plays a crucial role in agriculture
-humans have found many ways to adapt land for farming
-these changes can have long-lasting environmental impacts
Climate’s Impact on Agriculture
-climate plays a crucial role in shaping agricultural practices worldwide
Temperature and Crop Selection
-different crops thrive in different temperature ranges
-Example: wheat prefers cooler climates
-Example: Rice grows better in warmer temperatures
The Role of Precipitation in Agriculture
-rainfall patterns determine which crops can be grown without irrigation
-Example: coffee needs steady rainfall year-round
-this makes coffee suitable for tropical regions
Growing Season and Crop Choices
-growing season: time between last and first frost
-affects which crops can be grown in an area
Agricultural Zones: Where Farming is Challenging
-Most of Earth can support some agriculture, but there are exceptions
-1) highest latitudes (Arctic, Antarctic): Too cold for most plants
-2) highest elevations (Mountaintops): Thin air and cold limit growth
-3) areas with extreme precipitation: Too much or too little rain
Overcoming Climate Obstacles: Irrigation
-Irrigation allows farming in drier regions
-Example: Israel’s advanced drip irrigation enables desert agriculture
Greenhouses: Extending Growing Seasons
-greenhouses extend growing seasons in colder climates
-they control temperature and humidity for optimal growth
-Example: Netherlands uses greenhouses to export tomatoes and peppers
Climate-Controlled Storage Solutions
-preserves harvests in hot or humid climates
-Example: climate-controlled grain silos in India reduce post-harvest losses
Agriculture and the Economy
-Agriculture is a crucial part of the global economy
-it proves food and resources for billions of people
Subsistence Agriculture: Farming for Survival
-Goal: Produce enough food for the farmer and their family
-found mainly in less developed regions
-usually involves small farms (less than 2 acres)
-surplus may be sold or traded for income or goods
-Example: Families in rural sub-Saharan Africa growing yams and millet
Commercial Agriculture: Farming for Profit
-Goal: Sell crops or livestock for profit
-common in developed countries, growing in semi-periphery countries
-profits often reinvested in the farm (land, equipment, technology, training)
-typically larger scale than subsistence farming
-Example: large wheat farms in the US or Canada
Intensive vs. Extensive Farming
-Intensive Agriculture
-uses large amounts of inputs (energy, fertilizers, labor, machines)
-Aims to maximize crop yields
-Example: Greenhouse vegetable production
Extensive Agriculture:
-uses fewer inputs
-typically results in lower yields per acre
-Example: Cattle ranching in Argentina
Intensive Commercial and Subsistence Agriculture
Intensive Commercial Agriculture:
-heavy investments in labor and capital
-high yields
-Examples: Market gardening, plantations, large-scale crop systems
Intensive Subsistence Agriculture:
-labor and animal intensive
-Example: Rice paddles in Southeast Asia
Extensive Commercial and Subsistence Agriculture
Extensive Commercial Agriculture:
-low resource inputs but aims for profit
-Example: Cattle ranching in western US
Extensive Subsistence Agriculture:
-few inputs, practiced in areas with extreme climates
-Examples: Nomadic herding, shifting cultivation
The First Agricultural Revolution
-Began about 12,000 years ago
-also called the Neolithic Agricultural Revolution
-people started growing food instead of just hunting and gathering
-marked the beginning of farming and animal domestication
Agricultural Hearths: Where Farming Begins
-first places where farming started
-had high biodiversity, water, fertile soil, and moderate climate
-Example: Fertile Crescent, Yellow River Valley, Indus River Valley, Mesoamerica
Animal Domestication
-probably started by hunters in Central Asia
-began with dogs and horses, later expanded to goats, pigs, sheep, cattle
-provided food, farming, help, and materials for clothing, shelter
Plant Domestication
-early crops: wheat and barley (Middle East, rice (Asia, corn (Americas)
-provided a more reliable food source
-allowed people to stay in one place
-led to permanent settlements; higher-density communities
Where Did People Settle?
-usually along rivers which provided water, food, transportation, and defense
-regular flooding spread nutrients and kept land fertile (flood plains)
-Example: Nile River, Tigris and Euphrates, Yellow River
Agricultural Hearths Around the World
-China: rice and soybeans
-India: cotton and sesame civilization
-Mesoamerica: “three sisters”- corn, beans, and squash for balanced nutrition
-The Andes and Amazon regions: potatoes and quinoa (in high altitudes)
-Sub-Saharan Africa: sorghum and yams
-American: tomatoes and white potatoes
Food Surplus: The Engine of Civilization
-When farmers grow more food than their families needed, the extra food could support non-farmers
-allowed large populations to live together permanently for the first time
-Ancient Egypt and Mesopotamian civilizations became centers of power and innovation, eventually grew into the world’s first empires
-Without agriculture creating surplus food, this does not happen
Specialization of Labor: Creating Complex Societies
-Farming provided steady food, people no longer had to spend all their time searching for meals
-metalworkers forged tools and weapons
-weavers made textiles
-scribes developed writing systems
-priests and artists focused on spiritual and cultural needs of communities
-potters, soldiers, and other specialists each contributed their skills
-however, if also created social hierarchies where different jobs had different levels of status and power
Trade Networks: Connecting the World
-as civilizations specialized, they had extra goods to trade but needed raw materials from elsewhere
-The Silk Road was not a single path but a vast web of routes connecting East Asia to the Mediterranean
-Along with goods, merchants also spread ideas, religions, technologies, and unfortunately diseases
-this global exchange= more connected world
Second Agricultural Revolution
-period of major changes in farming beginning in the 1700s
-built an advance of the industrial revolution
-increased food production to support growing populations
Technological Advancements
-Steel Plow (1837): Made plowing easier, especially in tough soil
-McCormick reaper (1831): sped up harvesting dramatically
-improved fertilizers: better soil chemistry understanding
New Farming Techniques: Crop Rotation
-planting different crops in a specific order on the same land
-helped restore nutrients to the soil and increased yields
-Ex: wheat -> corn -> soybeans -> wheat
Changes in Property: Rights and Farm Size
-enclosure acts in Britain: wealthy could buy and fence off land
-led to larger, more efficient farms producing crops for profit
-many small farmers lost their land and way of life
Social and Economic Changes
-rural to urban migration: people moved to cities for factory work
-improved diets: better nutrition and increased life expectancy
-economic growth: surplus food led to increased trade and wealth
The Transportation Revolution
-improvements in roads, canals, ships, and railroads
-farmers could sell products in distance urban markets
-Ex: Erie Canal (1825) connected Great Lakes to New York City
What is the Green Revolution?
-third agricultural revolution began in the mid-20th century
-use of science and technology to increase food production
-aimed to meet demands of growing global population
Scientific Advancements
-development of higher-yield
-creation of hybrid wheat, rice, and corn
-introduction of hybrids
Technological Innovations
-introduction of modern machinery to developing countries
-Ex: tractors, tillers, broadcast seeders, grain carts
Positive impacts
-increased food production and crop yields
-prevented millions from starving
-some countries went from importing to exporting wheat
-improved crop yields (1960-2000)
-wheat= 208%
-corn= 157%
-rice= 109
Economic Benefits
-increased investment in public and private sectors
-government and university funding for agricultural research
-lower food prices due to increased supply
Negative Consequences
-environmental damage: soil erosion, pollution, species extinction
-social issues: gender inequalities, obstacles for small farmers
–health: concerns from increased use of pesticides and fertilize