Norfolk four-course system

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{{Short description|Method of crop rotation}}

The Norfolk four-course system is a method of agriculture that involves crop rotation. Unlike earlier methods such as the three-field system, the Norfolk system is marked by an absence of a fallow year. Instead, four different crops are grown in each year of a four-year cycle: wheat, turnips, barley, and clover or ryegrass.{{cite web|url=https://www.britannica.com/topic/Norfolk-four-course-system|title=Norfolk four-course system|website=Encyclopædia Britannica|publisher=Encyclopædia Britannica, inc.|accessdate=31 May 2017}}

This system was developed in the early 16th century in the region of Waasland (in present-day northern Belgium), and was popularized in the 18th century by British agriculturist Charles Townshend. The sequence of four crops (wheat, turnips, barley and clover), included a fodder crop (turnips) and a grazing crop (clover), allowing livestock to be bred year-round. The Norfolk four-course system was a key development in the British Agricultural Revolution.