Human Geography
Agriculture and Rural Land-Use Patterns and Processes
Agricultural Origins and Diffusions
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Agricultural Origins and Diffusions
Agricultural Origins and Diffusions
Introduction to Agriculture
- Agriculture refers to the planned cultivation of plants and rearing of animals for sustenance or economic gain.
- It revolutionised human existence, allowing permanent settlements (sedentism) and population growth.
- The origins of agriculture are found within the Neolithic Revolution, which took place around 10,000 years ago.
Theories of Agricultural Origins
- Carl Sauer proposed that agriculture originated in areas where plants and animals were naturally abundant - the oasis theory.
- The Demic Diffusion theory posits that agriculture spread via migration of farming communities.
- The Cultural Diffusion theory suggests that the knowledge and tools of farming spread among cultures without large-scale migration.
Primary Agricultural Hearths
- Key hearths of agricultural origin include the Fertile Crescent, Sub-Saharan Africa, China, and the Americas.
- The Fertile Crescent (including parts of present-day Iraq, Syria, Lebanon, Israel, Jordan) was a primary hearth, with agricultural activities like wheat and barley farming, and goat and sheep herding.
- Mesoamerica was a key hearth for maize, beans, and squash (the Three Sisters).
Diffusion of Agriculture
- Agriculture diffused outwards from these hearths by various methods: relocation diffusion (through migration) and expansion diffusion (through the spread of ideas).
- Expansion diffusion includes both hierarchical diffusion (from larger to smaller groups) and contagious diffusion (among neighbours).
Impact of Agricultural Diffusion
- The diffusion of agricultural practices transformed societies, landscapes, economic structures, and global ecosystems.
- The Columbian Exchange was a significant event in agricultural diffusion, involving the global transfer of plants, animals, diseases, and human populations between the New World and the Old World.
- New agricultural practices can act as a double-edged sword, causing a rise in food production but also leading to deforestation, loss of biodiversity, and environmental degradation.
