three-year rotation

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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

• 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

• Rotation in office — Rotation in office, or term limits, dates back to the American Revolution, and prior to that to the democracies and republics of antiquity. The council of 500 in ancient Athens rotated its entire membership annually, as did the ephorate in… …   Wikipedia

• Cullars Rotation — U.S. National Register of Historic Places …   Wikipedia

• Year — A year (from Old English gēar) is the orbital period of the Earth moving around the Sun. For an observer on Earth, this corresponds to the period it takes the Sun to complete one course throughout the zodiac along the ecliptic. In astronomy, the… …   Wikipedia

• Three Gorges Dam — Three Gorges Dam …   Wikipedia

• rotation of directors — Under the articles of association of most UK companies, the obligatory retirement of one third of the directors each year (normally at the annual general meeting), so that each director retires by rotation every three years. Retiring directors… …   Accounting dictionary

• rotation of directors — Under the articles of association of most UK companies, the obligatory retirement of one third of the directors each year (normally at the annual general meeting), so that each director retires by rotation every three years. Retiring directors… …   Big dictionary of business and management

• 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 — 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

• Tropical year — A tropical year (also known as a solar year), for general purposes, is the length of time that the Sun takes to return to the same position in the cycle of seasons, as seen from Earth; for example, the time from vernal equinox to vernal equinox,… …   Wikipedia