Agricultural Geography: Farming Systems, Types of Agriculture, Fisheries and Crop Geography

These agricultural geography notes for OPSC OAS cover agriculture as a primary activity and its place in the economy, the full family of cropping systems from monocropping to zero tillage, the subsistence and commercial types of farming, fisheries and their locational factors, eco-friendly and water-saving practices, world crop geography and the agricultural pattern of Odisha. Each section carries the facts OPSC and UPSC test, with mains-relevant analysis and practice questions at the end.

Agriculture as a Primary Activity

Economic activities are grouped into three sectors. Primary activities extract directly from nature — farming, fishing, mining, forestry and pastoralism. Secondary activities process raw materials into manufactured goods, such as iron smelting, garment making and basket weaving. Tertiary activities provide services, such as IT, trade, transport and banking.

Agriculture is the world's most widely adopted occupation. In developing economies it contributes a large share of GDP and the bulk of employment, while in developed economies its GDP share is small but productivity is very high. Agriculture began in the Neolithic period — the first agricultural revolution — long before medieval times, and the domestication of plants and animals is what made settled civilisation possible.

UPPSC 2018 asked in which field Norman Borlaug received the Nobel Prize — Peace, in 1970. There is no Nobel Prize in agriculture.

Cropping Systems and Field Practices

Cropping systems describe how crops are arranged in space and time on a field. OPSC and UPSC repeatedly test the distinctions between these terms, so the definitions and the specific differences must be memorised.

The distinctions that matter most in exams: intercropping is simultaneous with row patterns, mixed cropping is simultaneous without row patterns, sequential cropping is one after another in the same year, relay cropping overlaps the two, and mixed farming combines crops with livestock — a different concept altogether.

Crop rotation reduces risk rather than increasing it, because diversification breaks pest and pathogen cycles, balances nutrient demand and adds nitrogen when legumes are included. Zero tillage allows wheat to be sown directly into rice residue, which is the basis of the Happy Seeder technique that avoids stubble burning, enables direct seeding of rice without a nursery, and builds soil organic carbon.

NDA 2020 asked which term describes growing two or more crops simultaneously on the same land — mixed cropping. IAS 2020 asked about the advantages of zero tillage, and all three statements — residue sowing, direct paddy seeding and carbon sequestration — were correct.

Classification of Agriculture: Subsistence and Commercial

Farming systems are classified by their purpose, their intensity of input use and their level of technology. The primary division is between subsistence farming, where output feeds the farm family, and commercial farming, where output is sold in the market.

Nomadic Herding and Transhumance

Nomadic herding is a primitive subsistence activity in which herders depend primarily on animals rather than crops and move with their herds to find natural pasture. Animals are selected for their ability to survive harsh conditions, not for market demand. The practice is concentrated in the arid and semi-arid belt of North Africa, the Middle East and Central Asia, and also in the tundra, where reindeer are herded.

Transhumance is the seasonal movement of herders and livestock between winter lowlands and summer highlands, following the shifting snowline — as practised by the Kazakhs of Central Asia. Nomadic herding has contributed to soil erosion through overgrazing in some regions, and the number of pastoral nomads has declined globally because of land enclosure, settlement policies and modern ranching. Cattle are the principal livestock of tropical African pastoralists; reindeer are the livestock of the Arctic.

Shifting Cultivation (Slash and Burn)

Shifting cultivation is a primitive subsistence system in the humid tropics in which forest is cleared by fire, cropped for two or three years and then abandoned as fertility falls, with the cultivator moving to a fresh plot. Tools are simple, yields are low, and repeated burning with short fallow periods depletes soil fertility and exposes the soil to erosion. It occurs in Central America, South-East Asia, Central Africa and parts of India.

Intensive Subsistence Agriculture

Intensive subsistence agriculture is practised in the densely populated monsoon lands of Asia, where small holdings are worked with heavy manual labour to extract the maximum output. Its dominant feature is multiple cropping, with several crops taken from the same plot in a year. Landholdings are small and fragmented, population pressure on land is high, organic manure is used, and labour productivity is low because most work is manual.

Wet paddy is the principal crop wherever water is assured, and food crops dominate because the purpose is family consumption rather than sale. This is why agriculture in monsoon Asia is characterised by food-crop predominance.

Commercial Agriculture

Commercial grain farming

Commercial grain farming is extensive, highly mechanised and wheat-based, practised on large farms in the Prairies, Pampas, Steppes, Velds and Australian wheat belts. Farms are large and capital investment in machinery is high, so yield per hectare is low but output per worker is very high. Two types of wheat — winter and spring — are grown, and the surplus is exported. Winter wheat is sown in autumn and ripens in early summer; spring wheat is sown in spring in regions with severe winters, as in Canada and Siberia.

CDS 2020 asked which is not a commercial type — intensive subsistence agriculture. The Prairies are called the Wheat Bowl of the world.

Plantation agriculture

Plantations are large estates in the humid tropics devoted to a single crop — tea, rubber, coffee, cocoa, oil palm, sugarcane or spices — grown for export. The system was developed by European colonial powers to supply metropolitan markets, so it is capital-intensive, commercially oriented and dependent on good transport. Humid tropical soils are often leached and nutrient-poor, so plantations require heavy fertiliser input; the humid tropics are chosen for their climate, not their soil.

Mediterranean agriculture

Mediterranean agriculture occupies the western margins of continents between 30° and 45° latitude, where a dry summer alternates with a mild wet winter. Its most important feature is viticulture, the cultivation of grapevines, along with citrus fruits and olives, whose dry ripening season gives them their quality. It is a specialised commercial system. It occurs in the Mediterranean basin, California, central Chile, the Cape region of South Africa and southern Australia, but not in the Pampas, which is temperate grassland.

Mixed farming

Mixed farming combines crop cultivation with livestock rearing on the same farm, which diversifies income and spreads risk. It is typical of the humid temperate belt — North-West Europe, eastern North America and northern Eurasia. Mixed farms are moderate in size, carry cattle, sheep and pigs, and involve high capital expenditure on machinery and buildings. In genuine mixed farming a substantial part of the land is under pasture, so the ratio of cropland to total agricultural land is not very high.

Dairy farming and livestock ranching

Dairy farming is a commercial, scientific and labour-intensive activity. It locates near urban and industrial markets because milk is perishable, demand is high and transport is efficient. India is the world's largest milk producer in total volume, though countries such as Denmark, the Netherlands and Israel record much higher yield per animal.

Livestock ranching is the extensive grazing of sheep and cattle on natural pasture, practised in the Pampas, the savannas and the Prairies. Sheep is the most commercially versatile ranch animal because one animal yields mutton, wool and hide.

Cooperative farming

In cooperative farming, members pool land, machinery, inputs or processing facilities and share the benefits, while retaining land ownership. It gives small farmers access to seed, fertiliser, credit and machinery, and shared processing plants reduce per-unit costs. Denmark's cooperative dairy and bacon industry is the classic success story, and cooperatives are widespread in Western Europe. This is different from a collective farm, where the state owns the land.

NDA 2016 asked about plantation farming in the humid tropics — the reason is climate, not fertile soil, because humid tropical soils are heavily leached.

Fisheries and Aquaculture

Pisciculture is freshwater fish farming, mariculture is the farming of marine organisms, and aquaculture is the general term. Capture fisheries depend on natural stocks.

The greatest share of the world's fish catch comes from continental shelves, which are shallow, sunlit and nutrient-rich and therefore support abundant plankton. The major commercial fishing grounds lie in the cool waters of the Northern Hemisphere at comparatively higher latitudes — the North-West Pacific, North-East Atlantic and North-West Atlantic. The factors that encourage fishing are long continental shelves, the meeting of warm and cold currents that upwells nutrients, scarcity of agricultural land, and indented coastlines that provide harbours.

Cod is a demersal (bottom-dwelling) fish, not pelagic. Toba in Ise Bay, Japan, is renowned for cultured pearls; Stavanger in Norway specialises in canning brisling; and the Norwegian fishing fleet shifts seasonally from Bergen to the Lofoten Islands. The tropical fishing industry is underdeveloped because tropical fish are oily and less preferred, species are mixed with few pure shoals, and the industry is less mechanised — not because shelves are absent.

Fish farming has not fully met rising demand, so pressure on wild stocks continues and overfishing has worsened.

Sustainable and Eco-Friendly Agriculture

Organic farming excludes genetically modified seeds and synthetic pesticides and fertilisers, and relies on crop rotation, organic manure, biological pest control and ecologically protective practices. Rotation is central to it, not minimal.

Salinisation occurs when irrigation water evaporates and leaves salts behind. Salt crusts block soil pores and make soils impermeable and unproductive. Fertigation can control the alkalinity of irrigation water and improve nutrient availability while reducing leaching, but rock phosphate and similar insoluble phosphatic fertilisers cannot be delivered efficiently through drip systems. Biochar can be used in vertical farming media, promotes nitrogen-fixing microorganisms and improves water retention.

IAS 2011 asked the effect of salinisation — it makes some soils impermeable. IAS 2017 and IAS 2020 asked about water conservation, eco-friendly practices, fertigation and biochar.

Crop Geography: World Pattern

Cereals and pulses

Fibre crops

Cotton needs about 210 frost-free days. Egyptian cotton from the Nile valley is the finest quality. The American textile industry shifted from New England to the southern states because of lower production costs. Jute fibre comes from the stem (bast), and India is the largest producer of raw jute, with Bangladesh leading in finished goods. Sericulture is silkworm rearing; China is the largest silk producer and India second.

Plantation and beverage crops

Other crops

Saffron: Iran produces about 90% of world output. Iodine: Chile leads, from caliche deposits in the Atacama. Mustard: Canada is the largest producer, from Saskatchewan. Oilseeds include sesame, linseed and mustard. Sugarcane originated in South and South-East Asia and is an industrial cash crop needing heat and moisture. Wattle is grown in Kenya and South Africa for tannin from its bark, with small production in India in the Eastern Himalayan foothills.

Odisha Angle: Agriculture and Fisheries

Agriculture employs roughly half of Odisha's workforce, and about 70% of the state's population depends on it directly or indirectly. The state's agriculture divides into the fertile coastal delta, the rainfed western uplands and the hill tracts.

The Mahanadi, Brahmani and Baitarani deltas form the rice bowl of Odisha, with paddy as the dominant crop. Jute is concentrated in the coastal districts of Cuttack, Bhadrak and Balasore. The laterite uplands of the Eastern Ghats support cashew as the state's principal plantation crop, along with mango, coconut and betel vine. Groundnut is the main oilseed of western Odisha, and pulses and millets are grown in the drier districts of Kalahandi, Balangir and Koraput.

Odisha has one of the largest brackish-water resources in India. Chilika lagoon, Asia's largest brackish-water lagoon, supports a major fishery and thousands of fisher families, and Bhitarkanika supports extensive aquaculture. Inland and brackish-water fisheries contribute more to the state's fish output than marine fishing, even though the state has a long coastline.

For mains answers, note the paradox of Odisha agriculture: abundant water resources in the coastal deltas coexist with recurring drought in the western uplands, and the state has one of India's highest crop-insurance settlement records after cyclone and flood events. Reference schemes such as the Odisha Crop Loan Scheme and the state's millet mission in tribal districts for a balanced answer.

Practice Questions