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Jute, Kenaf & Roselle Plants |
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Jute (Corchorus capsularis & Corchorus olitorius),
Kenaf (Hibiscus cannabinus) and Roselle (H. sabdariffa var (Altissima) are
vegetable bast fibre plants next to cotton in importance. In the trade there are usually
two names of jute, White and Tossa. Corchorus capsularis is called White Jute and Corchorus
olitorius is called Tossa Jute. In India & Bangladesh Roselle is usually called
Mesta. Jute fibres are finer and stronger than Mesta and are, therefore, better in
quality.
Depending on demand, price and climate, the annual production of jute and allied fibres in
the world remains around 3 million tonnes.
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The fibre finds its use in the producing as well as in consuming
countries in the agricultural, industrial, commercial and domestic fields. Sacking and
Hessians (Burlap) constitute the bulk of the manufactured products. Sacking is commonly
used as packaging material for various agricultural commodities viz., rice, wheat,
vegetables, corn, coffee beans etc. Sacking and Hessian Cloth are also used as packing
materials in the cement and fertilizer manufacturing industries (New J.H. 1993). Fine
Hessian is used as carpet backing and often made into big bags for packaging other fibres
viz. cotton and wool.
Jute ranks next to cotton as a
natural fibre. Jute is a bast fibre crop along with a family of
few other natural fibres together generally called as Jute &
Allied Fibre Crops (JAF). They mainly occur in the equatorial,
the tropical and the sub-tropical zones. The main species of
jute and kenaf, which are the major components of JAF, under
cultivation include tossa jute (Corchorus olitorius), white jute
(C. capsularis), kenaf (Hibiscus cannabinus) and roselle/ mesta
(H. sabdariffa)
The preference
for cultivation of one species or the other varies from country
to country. Jute is preferred by Bangladesh, India and Nepal;
and kenaf is mainly grown in China and Indonesia, while roselle/
mesta is preferred in Thailand. The cultural and other aspects
of JAF crops are more or less the same while the fibre
characteristics differ. The fibres of jute are relatively finer
than those of kenaf and roselle; together these are called ‘raw
jute’ because of vast similarity in majority of the
characteristics and their use. Of the two jute contributes the
major share of production. For a list of other important natural
fibres please see Appendix.
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Centres
of origin |
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The prominent genera in this group
of JAF are Corchorus and Hibiscus. In fact, Corchorus, a genus
of the family Tiliaceae and Hibiscus of Malvaceae, share more or
less the same pattern of geographical distribution as they are
related phylogenetically. Both belong to the same sub-order
Malvineae of the order Malvales. The number of Corchorus species
is probably around 50–60, but over 170 Corchorus names are given
in the Index Kewensis. The genus is extremely variable, but all
species are apparently highly fibrous.
Corchorus
species are found in warm regions throughout the world, on all
continents and on numerous tropical and sub-tropical islands.
However, the centre of diversity and origin of the genus appears
to be Africa, where the largest number of Corchorus species,
around 30 has been found with highest concentration reported
from East and South Africa. Of the cultivated species C.
capsularis is omnipresent in Indo-Mynamar and South China, from
where it migrated into India and Bangladesh. In contrast, C.
olitorius originated from North Australia and Africa. Though
many workers earlier held the view about this species being
native to Sri Lanka, India and Kenya, it is now generally agreed
to have originated in Africa and migrated to India and China via
Egypt and Syria. |
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Economic Aspects |
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