APHG Unit 5 Agriculture Summary & Study Notes

🍃 Overview

AP Human Geography Unit 5 focuses on agriculture and the rural landscape. It covers the origins of farming, diffusion of agricultural practices, farm types, crop patterns, and how technology and globalization shape food systems. You will learn to analyze location, resources, and policy as drivers of farming choices and food security.

🚜 Agricultural Origins & Revolutions

First Agricultural Revolution (Neolithic) marks the shift from hunter-gatherers to sedentary farming, enabling population growth and specialization. Second Agricultural Revolution (Industrial era) introduced mechanization, crop rotation, and enclosure, boosting yields and enabling urbanization. Green Revolution (mid-20th century) spread high-yield varieties and modern inputs like fertilizers and irrigation, raising production but also increasing inequality and environmental concerns.

🧭 Land Use & Farm Typologies

Developed economies feature commercial farming with large-scale operation and market orientation, while many developing economies rely on subsistence farming or smallholder production. Common farm types include intensive subsistence (wet rice in Asia/Pacific), pastoral nomadism, shifting cultivation, plantations for cash crops, mixed crop and livestock, and dairy and horticulture. Global trends show growth of agribusiness and corporate farming, linked to global supply chains.

🌾 Von Thünen Model & Spatial Patterns

The Von Thünen model explains how land rent declines with distance from a market town, creating concentric rings for different crops and livestock. A key idea is that transport costs shape land use near markets. In reality, policy, technology, and environmental factors modify the model, but the core concept remains useful for understanding land-use decisions such as dairying near cities and grain farming farther away. $dR/dd < 0$ where $R$ is land rent and $d$ distance to market.

🌍 Agricultural Regions & Crops

Major systems include intensive subsistence with wet rice in East and South Asia, wheat and maize farming in North America and parts of Europe, and Mediterranean agriculture around the Mediterranean Basin. Plantation agriculture produces cash crops like coffee, tea, sugarcane, and cotton for export. In many regions, you’ll find mixed crop and livestock and specialized pastoralism depending on climate and resource availability.

💼 Agribusiness & Global Food Systems

Agriculture is highly integrated into agribusiness with commodity chains spanning seeds, inputs, processing, and distribution. Government policies and subsidies influence production and prices, while globalization enables rapid trade and plant breeding overseas. Debates focus on GMOs, patents, fair trade, and the distribution of benefits and risks along the supply chain.

♻️ Sustainability & Environmental Impacts

Industrial farming can strain soils, water, and biodiversity, leading to soil erosion, water use concerns, and pesticide resistance. Sustainable approaches include crop rotation, conservation tillage, organic farming, agroforestry, and drip irrigation. Addressing climate change and desertification is essential for long-term food security.

🧪 Biotechnology & the Future of Agriculture

Biotechnology, including GMOs, CRISPR, and biotech patents, promises greater yields and resilience but raises ethical and ecological concerns for smallholders and ecosystems. Policy and public perception shape adoption, with a focus on balancing productivity and safety. The future of agriculture likely depends on integrating science with traditional knowledge and local contexts.

🌱 Urban & Alternative Food Systems

Urban agriculture, including rooftop gardens and community plots, expands local food production and reduces transport costs. Alternative farming methods—such as vertical farming and soil-less cultivation—seek to increase resilience in dense urban environments. These trends complement traditional farming by diversifying food sources and supporting food sovereignty.