three-field rotation system

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• Three-field crop rotation — From the end of the Middle Ages until the 20th century, the three year rotation or three field rotation was practiced by farmers in Europe with a rotation of rye or winter wheat, followed by spring oats or barley, then letting the soil rest… …   Wikipedia

• three-field system — noun or three course system : a system of land cultivation under which the common land is divided into three parts of which one or two in rotation lie fallow in each year and the rest are cultivated …   Useful english dictionary

• Crop rotation — Fallow redirects here. For other uses, see Fallow (disambiguation). Satellite image of circular crop fields in late June 2001. Healthy, growing crops are green. Corn would be growing into leafy stalks by then. Sorghum, which resembles corn, grows …   Wikipedia

• Three-phase electric power — This article deals with where, how and why three phase is used. For information on the basic mathematics and principles of three phase, see three phase. Three phase electric power is a common method of alternating current electric power… …   Wikipedia

• Field hockey stick — In Field hockey, each player carries a stick and cannot take part in the game without it. The stick is usually between 36 and 38 long (but this is not defined or restricted)and traditionally made of wood but now almost all the more expensive… …   Wikipedia

• crop rotation — the system of varying successive crops in a definite order on the same ground, esp. to avoid depleting the soil and to control weeds, diseases, and pests. [1905 10] * * * Successive cultivation of different crops in a specified order on the same… …   Universalium

• Cartesian coordinate system — Illustration of a Cartesian coordinate plane. Four points are marked and labeled with their coordinates: (2, 3) in green, (−3, 1) in red, (−1.5, −2.5) in blue, and the origin (0, 0) in purple. A Cartesian coordinate system specifies each point… …   Wikipedia

• open-field system — ▪ agriculture       basic community organization of cultivation in European agriculture for 2,000 years or more. Its best known medieval form consisted of three elements: individual peasant holdings in the form of strips scattered among the… …   Universalium

• Polyphase system — A polyphase system is a means of distributing alternating current electrical power. Polyphase systems have three or more energized electrical conductors carrying alternating currents with a definite time offset between the voltage waves in each… …   Wikipedia

• Open field system — Generic map of a medieval manor, showing strip farming, from William R. Shepherd, Historical Atlas, 1923 The open field system was the prevalent agricultural system in much of Europe from the Middle Ages to as recently as the 20th century in some …   Wikipedia

• Geographic coordinate system — Map of Earth showing lines of latitude (horizontally) and longitude (vertically), Eckert VI projection; large version (pdf, 3.12MB) …   Wikipedia