History of Brassica campestris
Commonly known as field mustard or turnip mustard. The wild type is a slender-rooted, branching annual native to temperate Eurasia. It was probably a minor member of the pioneer flora of naturally open habitat that became enormously more abundant as a Neolithic weed of wheat and other crops.
The most primitive cultivars appear to be the rapes, i.e., those brown primarily as oilseed crops. Sanskrit records of sarson, a variety of B. campestris, show that it has been an important oilseed crop in India since at least 1500 BC.
Sarson and other varieties of B. campestris are still very commonly grown as oilseeds in the subcontinent.
Related varieties may have been equally ancient crops in southwestern Asia in pre-classical times, but they did not invade the domain of the olive in the Mediterranean.
The Roman encountered B. campestris as a crop of the barbarians in Gaul, not as rapeseed but as the turnip.
There are old Germanic, Slavic and Celtic, names for the turnip, and it evidently was selected as a root vegetable in northern Europe in antiquity.
Rape as an oilseed crop finally arrive in northern Europe from the eats in the late Middle Ages, but for centuries, it renamed a very minor crop.
Turnips, for both table vegetables and livestock fodder became increasingly important in northern Europe between the 15th an 18th centuries, largely because of development of new varieties.
One these is the stubble turnip, selected for very rapid growth in the autumn after the grain crop, usually rye, has been harvested.
History of Brassica campestris
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