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The units by which the yield of a crop is usually measured today are kilograms per hectare or bushels per acre.. Long-term cereal yields in the United Kingdom were some 500 kg/ha in medieval times, jumping to 2000 kg/ha in the Industrial Revolution, and jumping again to 8000 kg/ha in the Green Revolution. [1]
Food production per capita since 1961 Grain silos Rice plantation in Thailand Cambodians planting rice, 2004. Agricultural productivity is measured as the ratio of agricultural outputs to inputs. [1] While individual products are usually measured by weight, which is known as crop yield, varying products make measuring overall agricultural ...
Onions and shallots, dry India China Egypt: Onions and shallots, green China Mali Angola: Other beans, green China Indonesia India: Other vegetables, fresh n.e.c. China India Vietnam: Peas, green China India Pakistan: Pumpkins, squash and gourds China Russia Ukraine: Spinach China United States Turkey: String beans United States Morocco
The size of harvest bins can vary from small trays to half tons bins. In most of Europe, yield is measured in hectoliters per hectare, i.e., by the volume of wine.In most of the New World, yield is measured in tonnes per hectare (or short tons per acre in the USA) – i.e. by mass of grapes produced per unit area.
Livestock grazing comparison units are used by many governments to measure and control the intensity of farming. For example, until 2004 the UK Government had an extensification scheme which paid additional subsidy to farmers who kept their livestock at less than an average of 1.4 LUs per hectare. [1]
For example, average yields of corn (maize) in the US have increased from around 2.5 tons per hectare (t/ha) (40 bushels per acre) in 1900 to about 9.4 t/ha (150 bushels per acre) in 2001. Similarly, worldwide average wheat yields have increased from less than 1 t/ha in 1900 to more than 2.5 t/ha in 1990.
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In 1987 about 2.7 million private farms were in operation. About 57 percent of these were smaller than 5 hectares (12 acres). Of the remaining farms, 25 percent were between 5 and 15 hectares (12 and 37 acres) and 11 percent were between 10 and 15 hectares (25 and 37 acres). Only 7 percent of private farms were larger than 15 hectares (37 acres).