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TURNIP , Brassica campestris, See also:var. Rapa, a See also:hardy biennial, found in cornfields in various parts of See also:England. It has been cultivated from a remote See also:period for its fleshy roots. The See also:tender growing tops are also used in See also:spring as a See also:green See also:vegetable. The so-called " See also:root " is formed by the thickening of the See also:primary root of the seedling together with the See also:base of the See also:young See also:stem (hypocotyl) immediately above it. The See also:great See also:mass of the " root " consists of soft " See also:wood " See also:developed internally by the cambium layer and composed mainly of thin-walled, unlignified, wood-parenchyma. The stem remains See also:short during the first See also:year, the leaves forming a rosette-like bunch at the See also:top of the " bulb "; they are grass-green and See also:bear rough hairs. In the second See also:season the bud in the centre of the rosette forms a strong erect branched stem bearing somewhat See also:glaucous smooth leaves. The stem and branches end in corymbose racemes of small, See also:bright yellow See also:flowers, which are succeeded by smooth, elongated, short-beaked pods.
The varieties of turnip are classified according to their shape as (I) See also:long varieties, with a root three or more times as long as broad; (2) See also:tankard or spindle-shaped varieties, with a root about twice as long as broad; (3) See also:round or globe varieties with an almost spherical root; (4) See also:flat varieties with a root broader than long; there are also many intermediate forms. Turnips are also grouped according to the See also:colour of the upper See also:part of the root which comes above ground, and according to the colour of the flesh, which is See also: The swede-turnip, Brassica campestris, var. Napo-brassica, differs from the turnip proper in having the first foliage-leaves glaucous, not grass-green, in colour, and the later leaves smooth and glaucous; the root bears a distinct See also:neck with well-marked See also:leaf-scars, the flesh is yellow or reddish-See also:orange, firmer and morenutritious, and the roots keep much better during See also:winter. The flowers are larger and See also:buff-yellow or See also:pale orange in colour and the seeds are usually larger and darker than in the turnip.
Turnips should be grown in a See also:rich friable sandy See also:loam, such as will produce See also:medium-sized roots without much aid from the manure heap, and are better flavoured if grown in fresh See also:soil. In See also:light dry soils well decomposed hotbed or farmyard manure is the best that can be used, but in soils containing an excess of organic See also:matter, See also:bone dust, superphosphate of See also:lime, wood-ashes or See also:guano, mixed with light soil, and laid in the drills before See also:sowing the See also:seed, are beneficial by stimulating the young See also:plants to get quickly into rough leaf, and thus to grow out of reach of the so-called turnip See also:fly or turnip See also:flea (Phyllotreta). To get rid of this pest, it has been found beneficial to dust the plants with quicklime, and also to draw over the young plants nets smeared with some sticky substance like See also:treacle, by which large See also:numbers will be caught and destroyed. It has been also recommended as a palliative to sow thick in See also:order to allow for a percentage of loss from this and other causes, but this is inadvisable, as over-crowding is See also:apt to render the plants weak. As a preventive, See also:gas-lime may be scattered over the See also:surface after the seed has been sown. Lime is also effective against the disease known as " See also:finger and toe " (q.v.).
The first sowing should be made on a warm border, with the See also:protection of a See also:frame or matted hoops, in See also:January or See also:February; the second on a well-sheltered border in See also: If the See also:weather is showery at the See also:time of sowing, the seed speedily germinates, and the young plants should be kept growing quickly by watering with. See also:rain or See also:pond See also:water and by surface stirrings. The drills for the earliest sorts need not be more than 15 in. apart, and the plants may be See also:left moderately thick in the See also:row; the See also:late crops should have at least 2 ft. between the rows, and be thinned to 12 in. in the row, a See also:free circulation of See also:air about them being very important in winter. As a See also:provision against prolonged periods of severe weather it has been recommended to See also:lay the finest roots in rows, covering them well with soil, and leaving intact the whole of the foliage, The very latest sown crops of See also:half-grown roots will prolong the See also:supply until the earliest spring-sown crops are See also:fit for use. Additional information and CommentsThere are no comments yet for this article.
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