The world relies on farming (also called agriculture) for its food. Farms range in size from large commercial businesses that provide food for sale at home and abroad (cash crops), to small farms that produce only enough food for the community (subsistence farming).
There are several different kinds of farming. Arable farming is the cultivation of crops, which include cereals, vegetables and plants for making industrial products such as oil and cotton cloth. Another type of cultivation is growing trees or vines, such as fruit orchards, vineyards, and rubber or coffee plantations. Livestock farming involves keeping animals such as pigs, cows and sheep for meat, milk or wool. The animals graze on permanent grassland or rough pasture, including heath land, scrub, mountain slopes or tundra grasses. Some farmers concentrate on one type of farming, while others have mixed farms where they both grow crops and keep livestock.
Intensive farming methods are used to increase food production. For example, intensive egg production involves keeping hens in tiny, crowded cages where they spend their lives just laying eggs. Many people regard this type of farming as cruel.
“Free-range” products come from animals kept in more natural surroundings. These include eggs from hens that have been allowed to roam around in the farmyard. Farmers on commercial farms use chemicals to keep pests and weeds at bay. These chemicals cause pollution of the soil and water, and may get into the crops or livestock themselves. Organic farmers do not use artificial pesticides or fertilizers, but enrich the soil with natural fertilizers such as seaweed and manure. Some people prefer free-range and organic products, believing them to taste better and be safer to eat.
Not all farmers settle in one place. Some livestock farmers are nomadic – they move around with their herds, looking for fresh grazing land. Shifting cultivation is a system where arable farmers move on when the soil becomes exhausted. The most common method is slash-and-burn, which is practised in tropical regions such as the Amazon rainforests. Land is cleared by burning patches of forest. After a few years of planting crops such as maize, manioc, millet and yams, the rainforest soil is no longer fertile, so the farmers clear a new area, leaving the previous land to return to its natural state.
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