DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
Carrots (Daucus carota) require a well drained soil without stones present, in order to produce a crop of undistorted roots. In many sois these conditions are best achieved by growing the crop in raised beds. This involves two cycles of tillage; an initial ploughing to produce deep furrows, and a second stage in which the flat-topped seed bed is produced. The pictures shows this second stage. To the right of the machine, the field has been deep ploughed. The machine moves along the furrows, takes the roughly ploughed soil from the ridges, and riddles it to remove clods, stones and plant material that was turned under by the plough. This coarse mixture is dropped into the bottom of the adjacent furrow, and the riddled soil is formed into the flat seed bed. The result of the passage of the machine is visible to the left of the picture, and behind the machine as it moves forward.
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