Agriculture

Agriculture is the practice of cultivating plants and rearing animals for food, fiber, medicinal plants, and other products used to sustain and enhance human life. It is a foundational human activity that enabled the rise of sedentary civilization, fundamentally transforming societies and their relationship with the environment. The development of agriculture involved the domestication of species, leading to food surpluses that supported population growth and the development of cities. Modern agriculture encompasses a vast range of practices and scales, from smallholder farms to large-scale industrial operations, and is deeply interconnected with global economic, environmental, and social systems.

History

The origins of agriculture, known as the Neolithic Revolution, occurred independently in several regions including the Fertile Crescent, the Yangtze and Yellow River basins, Mesoamerica, the Andes, and the Eastern United States. Early farmers domesticated key species such as wheat and barley in the Near East, rice in Asia, and maize in the Americas. The subsequent Iron Age saw the adoption of improved tools like the ard, while the Columbian Exchange after 1492 dramatically reshaped global agricultural systems by transferring crops and livestock between the Old World and the New World. The British Agricultural Revolution introduced innovations like crop rotation, followed by the mechanization of the Industrial Revolution. The 20th century's Green Revolution, spearheaded by figures like Norman Borlaug of the International Maize and Wheat Improvement Center, introduced high-yielding varieties, synthetic fertilizer, and pesticides, vastly increasing production.

Types of agricultural practices

Agricultural systems are categorized by their methods and scale. Subsistence agriculture focuses on producing enough food for a family or community, prevalent in parts of Africa, Asia, and Latin America. In contrast, intensive farming aims to maximize output from a given land area using high inputs, characteristic of operations in the Midwestern United States or the Netherlands. Organic farming, governed by standards like those of the United States Department of Agriculture, avoids synthetic inputs. Pastoralism involves raising livestock on natural pastures, as seen with the Maasai people in East Africa. Other specialized forms include horticulture for fruits and vegetables, viticulture for grapes, and aquaculture for fish, with major centers like Nori production in Japan. Plantation agriculture, historically associated with crops like rubber in Malaysia and sugarcane in Brazil, operates on a large scale.

Agricultural production

Global agricultural output is dominated by a few staple crops. According to the Food and Agriculture Organization, the top cereals are maize, wheat, and rice, with major producers including the United States, China, and India. Soybean and palm oil are leading oil crops, heavily cultivated in Brazil and Indonesia. Cotton and jute are primary fiber crops. Livestock production for meat, dairy, and wool is significant in regions like the Great Plains and New Zealand. Production systems rely on inputs such as irrigation water from projects like the Indus River system, genetically modified seeds from companies like Monsanto, and machinery from manufacturers like John Deere. The supply chain involves entities ranging from Archer-Daniels-Midland in processing to Walmart in retail distribution.

Environmental impact

Agriculture significantly alters the environment. Land use change, including deforestation of the Amazon rainforest for pasture, is a major driver of habitat destruction and biodiversity loss. It is a primary source of water pollution from nutrient runoff causing eutrophication in bodies like the Gulf of Mexico. The sector is a major emitter of greenhouse gases, including methane from ruminant livestock and nitrous oxide from fertilizers. Soil degradation through erosion and salinization, as seen in the Aral Sea region, threatens long-term productivity. Water scarcity is exacerbated by agricultural use, evident in the depletion of the Ogallala Aquifer. Conversely, practices like conservation tillage and agroforestry are promoted to mitigate these impacts.

Social and economic aspects

Agriculture remains a vital economic sector, employing over a quarter of the global workforce, with high proportions in countries like India and many in Sub-Saharan Africa. It is central to food security and international trade, governed by agreements through the World Trade Organization. The structure of agriculture has shifted dramatically, with agricultural economics revealing trends toward farm consolidation and the rise of agribusiness corporations like Cargill and Tyson Foods. Issues of labor include the reliance on migrant workers in areas like California and historical patterns of sharecropping. Movements such as La Via Campesina advocate for food sovereignty and the rights of smallholders. Research and policy are shaped by institutions including the World Bank and the Consultative Group on International Agricultural Research. Category:Agriculture