قراءة كتاب The Jute Industry: From Seed to Finished Cloth

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The Jute Industry: From Seed to Finished Cloth

The Jute Industry: From Seed to Finished Cloth

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دار النشر: Project Gutenberg
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another reason for the primitive Eastern methods may be the absence of horses.

The ploughs are made of wood and faced with iron. Bullocks, in teams of two or more, are harnessed to the plough as shown in Fig. 1 where a field is being ploughed as a preliminary process in jute cultivation. The bullocks draw the plough in much the same way as horses do in this country.

The operation of ploughing breaks up the soil, while the rough clods may be broken by hand mallets or by the use of the "hengha"--a piece of tree boll harnessed at the ends to a pair of bullocks.

The breaking up of the land prepares it for the cleaning process which is performed by what are termed "ladders"; these ladders are made of a few bamboos fixed cross-wise and provided with projecting pins to scratch or open the soil, and to collect the roots of the previous crop; they are the equivalent of our harrows, and may be used repeatedly during the winter and spring seasons so that a fine tilth may be produced.

When manure is essential, it is applied in the later ploughings, but other large areas have artificial or chemical manures added at similar stages in the process. Farm-yard manure is preferred, but castor-cake and the water hyacinth--a weed--constitute good substitutes.

After the soil has been satisfactorily prepared, the seed is sown by hand at the period which appears most suitable for the particular district. The usual sowing time is from February to the end of May, and even in June in some districts where late crops can be obtained.

FIG. 1 NATIVES PLOUGHING THE GROUND

FIG. 1 NATIVES PLOUGHING THE GROUND

There are early and late varieties of the plants, and a carefully judged distribution of the varieties of seed over the districts for the growing period will not only yield a succession of crops for easy harvesting, but will also help the farmer in the selection of seeds for other areas where atmospheric conditions differ.

It is a good practice, where possible, to sow the seed in two directions at right angles to each other, and thus secure as uniform a distribution as possible. The amount of seed used depends partly upon the district, and in general from 10 lbs. to 30 lbs. per acre are sown. The seed may cost about 8 annas or more per ser (about 2 lbs.).

 FIG. 2 BREAKING UP THE SOIL, OR 'LADDERING'

FIG. 2 BREAKING UP THE SOIL, OR "LADDERING"

Plants should be specially cultivated for the production of seed in order to obtain the best results from these seeds for fibre plants. Many of the ryots (farmers) use seed which has been collected from plants grown from inferior seed, or from odd and often poor plants; they also grow plants year after year on the same soil. The fibres obtained, as a rule, and as a result of this method of obtaining seeds, gradually deteriorate; much better results accrue when succession of crops and change of seed are carefully attended to.

If the weather conditions are favourable, the seeds will germinate in 8 to 10 days, after which the plants grow rapidly. The heat and showers of rain combined soon form a crust on the soil which should be broken; this is done by means of another ladder provided with long pins, and Fig. 2 illustrates the operation in process. This second laddering process opens up the soil and allows the moisture and heat to enter. The young plants are now thinned, and the ground weeded periodically, until the plants reach a sufficient height or strength to prevent the words from spreading.

The space between the growing plants will vary according to the region; if there is a tendency to slow growth, there is an abundance of plants; whereas, the thinning is most severe where the plants show prospects of growing thick and tall.

In a normal season the plants will reach maturity in about 3 1/2 to 4 months from the time of sowing. Although different opinions are held as to the best time for harvesting, that when the fruits are setting appears to be most in favour; plants harvested at this stage usually yield a large quantity of good fibre which can be perfectly cleaned, and which is of good spinning quality.

The plants are cut down by hand and with home-made knives; in general, these knives are of crude manufacture, but they appear to be quite suitable for the purpose. A field of jute plants ready for cutting will certainly form a delightful picture, but the prospect of the operation of cutting indicates a formidable piece of work since it requires about 10 to 14 tons of the green crop to produce about 10 to 15 cwt. of clean dry fibre.


CHAPTER III. RETTING

The method of separating the bast layer (in which the fibres are embedded) from the stem of the plant requires a large supply of water, since the plants must be completely submerged in the water for a period varying from 8 to 30 days; such time is dependent upon the period of the year and upon the district in which the operation is performed.

The above operation of detaching the bast layer from the stem is technically known as "retting," and a good type of retting or steeping place is an off-set of a run, branch, or stream where the water moves slowly, or even remains at rest, during the time the plants are under treatment.

The disintegration of the structural part of the plant is due to a bacterial action, and gas is given off during the operation. The farmer, or ryot, and his men know what progress the action is making by the presence of the air bells which rise to the surface; when the formation of air bells ceases, the men examine the plants daily to see that the operation does not go too far, otherwise the fibrous layer would be injured, and the resulting fibre weak. The stems are tested in these examinations to see if the fibrous layer, or bast layer, will strip off clean from the wood or stem. When the ryot considers that the layers are separated from the core sufficiently easy, the work of steeping ceases, and the process of stripping is commenced immediately. This latter process is conducted in various ways depending upon the practice in vogue in the district.

In one area the men work amongst the water breaking up the woody structure of the retted plants by means of mallets and cross rails fixed to uprights in the water; others break the stems by hand; while in other cases the stems are handed out of the water to women who strip off the fibrous layer and preserve intact the central core or straw to be used ultimately for thatching. The strips of fibre are all cleaned and rubbed in the water to remove all the vegetable impurities, and finally the fibre is dried, usually by hanging it over poles and protecting it from the direct rays of the sun.

If the water supply is deficient in the vicinity where the plants are grown, it may be advantageous to convey the fibrous layers to some other place provided with a better supply of water for the final washing and drying; imperfect retting and cleaning are apt to create defects in the fibre, and to cause considerable trouble or difficulties in subsequent branches of the industry.

Fig. 3 illustrates photomicrographs of cross sections of a jute plant. The lower illustration represents approximately one quarter of a complete cross section. The central part of the stem or pith is lettered A; the next wide ring B is the woody matter; the outer covering or cuticle is marked C; while the actual fibrous layer appears

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