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See also:COTTON (Fr. coton; from Arab. qutun) , the most important of the See also:vegetable See also:fibres of the See also:world, consisting of unicellular hairs which occur attached to the seeds of various See also:species of See also:plants of the genus Gossypium, belonging to the See also:Mallow See also:order (See also:Malvaceae) . Each fibre is formed by the outgrowth of a single epidermal See also:cell of the testa or See also:outer coat of the See also:seed . - See also:Botany and Cultivation.—The genus Gossypium includes herbs and shrubs, which have been cultivated from See also:time immemorial, and are now found widely distributed throughout the tropical and subtropical regions of both hemispheres . See also:South See also:America, the See also:West Indies, tropical See also:Africa and See also:Southern See also:Asia are the homes of the various members, but the plants have been introduced with success into other lands, as is well indicated by the fact that although no species of Gossypiumn is native to the See also:United States of America, that See also:country now produces over two-thirds of the world's See also:supply of See also:cotton . Under normal conditions in warm climates many of the species are perennials, but, in the United States for example, See also:climatic conditions necessitate the plants being renewed annually, and even in the tropics it is often found advisable to treat them as annuals to ensure the See also:production of cotton of the best quality, to facilitate cultural operations, and to keep See also:insect and fungoid pests in check . Microscopic examination of a specimen of mature cotton shows that the hairs are flattened and See also:twisted, resembling somewhat in See also:general See also:appearance an empty and twisted See also:fire See also:hose . This characteristic is of See also:great economic importance, the natural twist facilitating the operation of See also:spinning the fibres into See also:thread or See also:yarn . It also distinguishes the true cotton from the See also:silk cottons or flosses, the fibres of which have no twist, and do not readily spin into thread, and for this See also:reason, amongst others, are very considerably less important as textile fibres . The See also:chief of these silk cottons is kapok, consisting of the hairs See also:borne on the interior of the pods (but not attached to the seeds) of Eriodendron anfracluosum, the silk cotton See also:tree, a member of the Bombacaceae, an order" very closely allied to the Malvaceae . See also:Classification.—Considerable difficulty is encountered in attempting to draw up a botanical classification of the species of Gossypium . Several are only known in cultivation, and we have but little knowledge of the See also:wild See also:parent forms from which they have descended . During the periods the cottons have been cultivated, selection, conscious or unconscious, has been carried on, resulting in the raising, from the same stock probably, in different places, of well-marked forms, which, in the See also:absence of the See also:history of their origin, might be regarded as different species . Then again, during at least the last four centuries, cotton plants have been distributed from one country to another, only to render still more difficult any See also:attempt to establish de- finitely the origin of the varieties now grown . Under these circum- stances it is not sur- prising to find that those who have paid See also:attention to the botany of the cottons differ greatly in the number of species they recog- nize . See also:Linnaeus de- scribed five or six species, de C an d of l e thirteen . Of the two See also:Italian botanists who in comparatively See also:recent years have mono-graphed the See also:group, Parlatore (Le Specie dei cotoni, r866) recognizes seven species, whilst Todaro (Relazione See also:sulla culta dei cotoni, 1877–1878) describes over fifty species: many of these, however, are of but little economic importance, and, in spite of the difficulties mentioned above, it is possible for See also:practical purposes to See also:divide the commercially important plants into five species, placing these in two See also:groups according to the See also:character of the hairs borne on the seeds . See also:Sir G . See also:Watt's exhaustive See also:work on Wild and Cultivated Cotton Plants of the World (1907) is the latest authority on the subject; and his views on some debated points have been incorporated in the following See also:account . A seed of " See also:Sea See also:Island cotton " is covered with See also:long hairs only, which are readily pulled off, leaving the comparatively small See also:black seed quite clean or with only a slight fuzz at the end, whereas a seed of " Upland " or See also:ordinary See also:American cotton bears both long and See also:short hairs; the former are fairly easily detached (less easily, however, than in Sea Island cotton), whilst the latter adhere very firmly, so that when the long hairs are pulled off the seed remains completely covered with a short fuzz . This is also the See also:case with the ordinary See also:Indian and See also:African cottons . There remains one other important group, the so-called " See also:kidney " cottons in which there are only long hairs, and the seed easily comes away clean as with " Sea Island," but, instead of each seed being See also:separate, the whole group in each of the three compartments of the See also:capsule is firmly united together in a more or less kidney-shaped See also:mass . Starting with this as the basis of classifica- i . Seeds covered with long hairs only, See also:flowers yellow, turning to red . A .
Seeds separate
.
Country of origin,Tropical America—(r) G.barbadense,L
.
1 B
.
Seeds of each loculus united
.
1 Country of origin, S
.
America—(2) G.brasiliense, Macf
.
ii
.
Seeds covered with long and short hairs
.
A
.
Flowers yellow or See also: Flowers white . Country of origin, See also:Mexico—(3) G. hirsutum, L . b . Leaves 3 to 5, seldom 7 lobed . Small . Flowers yellow . Country of origin, See also:India—(4) G. herbaceum, L . B . Flowers See also:purple or red . Leaves 3 to 7 lobed . See also:Place of origin, Old World—(5) G. arboreum, L . r . G. barbadense, Linn . This plant, known only in cultivation, is usually regarded as native to the West Indies . Watt regards it as closely allied to G. vitifolium, and considers the See also:modern stock a hybrid, and probably not indigenous to the West Indies . He classifies the modern high-class Sea Island cottons as G. barbadense, See also:var. maritima . Whatever may be its true botanical name it is the plant known in See also:commerce as " Sea Island " cotton, owing to its introduction and successful cultivation in the Sea Islands and the coastal districts of South Carolina, See also:Georgia and See also:Florida . It yields the most valuable of all cottons, the hairs being long, See also:fine and silky, and ranging in length from s to 22 in . By careful selection (the methods of which are described below) in the United States, the quality of the product was much improved, and on the recent revival of the cotton See also:industry in the West Indies American " Sea Island " seed was introduced back again to the See also:original See also:home of the species . See also:Egyptian cotton is usually regarded as being derived from the same species . Watt considers many of the Egyptian cottons to be races or hybrids of G. peruvianum, Cay . Egyptian cotton in length of See also:staple is intermediate between See also:average Sea Island and average Upland . It has, however, certain characteristics which cause it to be in demand even in the United States, where during recent years Egyptian cotton has comprised about 8o% of all the " See also:foreign " cottons imported . These See also:special qualities are its fineness, strength, See also:elasticity and great natural twist, which combined enable it to make very fine, strong yarns, suited to the manufacture of the better qualities of See also:hosiery, for mixing with silk and See also:wool, for making See also:lace, &c .
It also mercerizes very well
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The See also:principal varieties of Egyptian cotton are: Mitafifi, the best-known and most extensively grown, See also:hardy and but little affected by climatic variation
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It is usually regarded as the See also:standard Egyptian cotton; the See also:lint is yellowish See also:
(G. peruvianum, Engler), or kidney cotton
.
Amongst the varieties of cotton which are derived from this species appear to be See also:Pernambuco, Maranham, See also:Ceara, See also:Aracaty and Maceio cottons The fibre is generally white, somewhat harsh and wiry, and especially adapted for mixing with wool
.
The staple varies in length from 1 to about Ii in
.
3
.
G. hirsutum, Linn
.
Although G. barbadense yields the most valuable cotton, G. hirsutum is the most important cotton-yielding plant, being the source of American cotton, i.e
.
Upland, Georgia, New See also: See also:Levant cotton is derived from this species . The See also:majority of the races of cotton cultivated in India are often referred to this species, which is closely allied to G. hirsutum and has been regarded as identical with it . Amongst the cottons of this source are See also:Hinganghat, See also:Tinnevelly, See also:Dharwar, See also:Broach, See also:Amraoti (Oomras or Oomrawattee), See also:Kumta, Westerns, Dholera, Verawal, Bengals, See also:Sind and See also:Bhaunagar . Watt dissents from this view and classes these Indian cottons as G. obtusifolium and G . See also:Nanking with their varieties . The Indian cottons are usually of short staple (about t in.), but are probably capable of improvement . 5 . G. arboreum, Linn . This species is often considered as indigenous to India, but Dr Engler has pointed out that it is found wild in Upper See also:Guinea, See also:Abyssinia, See also:Senegal, etc . It is the " tree cotton " of India and Africa, being typically a large See also:shrub or small tree . The fibre is fine and silky, of about an See also:inch in length . In India it is known as Nurma or Deo cotton, and is usually stated to be employed for making thread for the turbans of the priests . Commercially it is of comparatively minor importance . The following table, summarized from the Handbook to the Imperial See also:Institute Cotton See also:Exhibition, 1905, giving the length of staple and value on one date (See also:January 16, 1905), will serve to indicate the See also:comparative values of some of the principal commercial cottons . The actual value, of course, fluctuates greatly . Length of Staple . Value Inches . Per lb . Sea Island Cotton— s. d . Carolina Sea Island . 1.8 I 3 Florida 1.8 i o Georgia „ I.7 See also:I14 See also:Barbados ,, 2.0 I 3 Egyptian Cottons I.5 94 Yannovitch . Abassi I.5 81- See also:Good Brown Egyptian (Mitafifi) 1.2 American Cotton I.3 41 Good middling See also:Memphis . Good middling Texas 1.o 4k Good middling Upland . 1.o 4 Indian Cottons o•8 Fine Tinnevelly Fine Bhaunagar 1•o 3i 3 Fine Amraoti . 1•o 3 Fine Broach 0.9 3;I Fine See also:Bengal 0.9 311- Fine ginned Sind o•8 316 Good ginned Kumta 1•o 31 The See also:close relationship between the length of the staple and the See also:market See also:price will be at once apparent . Cultivation.—Cotton is very widely cultivated throughout the world, being grown on a greater or less See also:scale as a commercial See also:crop in almost every country included in the broad See also:belt between latitudes 430 N. and 330 S., or approximately within the isothermal lines of 6o° F . The cotton plant requires certain conditions for its successful cultivation; but, given these, it is very little affected by seasonal vicissitudes . Thus, for example, in the United States the worst See also:season rarely diminishes the crop by more than about a See also:quarter or one-third; such a thing as a " See also:half-crop " is unknown . Various climatic factors may cause temporary checks, but the growing and maturing See also:period is sufficiently long to allow the plants to overcome these disturbances . Cotton requires for its development from six to seven months of favourable See also:weather . It thrives in a warm See also:atmosphere, even in a very hot one, provided that it is moist and that the transpiration is not in excess of the supply of See also:water . An See also:idea of the requirements of the plant will perhaps be afforded by summarizing the conditions which have been found to give the best results in the United States . During See also:April (when the seed is usually sown) and May frequent See also:light showers, which keep the ground sufficiently moist to assist germination and the growth of the See also:young plants, are desired . Three to four inches of See also:rain per See also:month is the average . The active growing period is from See also:early See also:June to about the See also:middle of See also:August . During June and the first fortnight in See also:July plenty ofsunshine is necessary, accompanied by sufficient rain to promote healthy, but not excessive, growth; the normal rainfall in the cotton belt for this period is about 4 in. per month . During the second portion of July and the first of August a slightly higher rainfall is beneficial, and even heavy rains do little harm, provided the subsequent months are dry and warm . The first flowers usually appear in June, and the bolls ripen from early in August . Picking takes place normally during See also:September and See also:October, and during these months dry weather is essential . Flowering and fruiting go on continually, although in diminishing degree, until the See also:advent of See also:frost, which kills the flowers and young bolls and so puts an end to the production of cotton for the season . In the tropics the essential requirements are very similar, but there the dry season checks production in much the same way as do the frosts in temperate climates . In either case an adequate but not excessive rainfall, increasing from the time of See also:sowing to the period of active growth, and then decreasing as the bolls ripen, with a dry picking season, combined with sunny days and warm nights, provide the ideal conditions for successful cotton cultivation . In regions where climatic conditions are favourable, cotton grows more or less successfully on almost all kinds of See also:soil; it can be grown on light sandy soils, loams, heavy See also:clays and sandy " bottom " lands with varying success . Sandy uplands produce a short stalk which bears fairly well . See also:Clay and " bottom " lands produce a large, leafy plant, yielding less lint in proportion . The most suitable soils are See also:medium grades of See also:loam . The soil should be able to maintain very See also:uniform conditions of moisture . Sudden See also:variations in the amount of water supplied are injurious: a sandy soil cannot retain water; on the other See also:hand a clay soil often maintains too great a supply, and See also:rank growth with excess of foliage ensues .
The best soil for cotton is thus a deep, well-drained loam, able to afford a uniform supply of moisture during the growing period
.
See also:Wind is another important See also:factor, as cotton does not do well in localities subject to very high winds; and in exposed situations, otherwise favourable, wind belts have at times to be provided
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Cultivation in the United States.—The United States being the most important cotton-producing country, the methods of cultivation practised there are first described, notes on methods adopted in other countries being added only when these differ considerably from American practice
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The culture of cotton must be a clean one
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It is not necessarily deep culture, and during the growing season the cultivation is preferably very shallow
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The result is a great destruction of the humus of the soil, and great leaching and washing, especially in the light loams of the See also: More intelligent planters drain their bottom-lands with underground or open drains . In the case of small plantations the difficulties of adjusting a right-of-way for outlet ditches have interfered seriously with this See also:plan . Many planters question the See also:wisdom of deepbreaking and subsoiling . There can be no question that a deep soil is better for the cotton-plant; but the expense of obtaining it, the See also:risk of injuring the soil through leaching, and the danger of bringing poor soil to the See also:surface, have led many planters to oppose this plan . Sandy soils are made thereby too dry and leachy, and it is a questionable proceeding to turn the heavy clays upon the See also:top . Planters are, as a result, divided in See also:opinion as to the wisdom of subsoiling . Nothing definite can be said with regard to a rotation of crops upon the cotton See also:plantation . Planters appreciate generally the value of broad-leaved and narrow-leaved plants and See also:root crops, but there is an absence of exact knowledge, with the result that their practices are very varied . It is believed that the rotation must differ with every variety of soil, with the result that each planter has his own method, and little can be said in general . A more careful study of the See also:physical as well as the chemical properties of a soil must precede intelligent experimentation in rotation . This knowledge is still lacking with regard to most of the cotton soils . The only uniform practice is to let the fields " See also:rest " when they have become exhausted . Nature then restores them very rapidly . The exhaustion of the soil under cotton culture is chiefly due to the loss of humus, and nature soon puts this back in the excellent See also:climate of the cotton-growing belt . Fields considered utterly used up, and allowed to " rest " for years, when cultivated again have produced .better crops than those which had. been under a more or less thoughtful rotation . In spite of the clean culture, good crops of cotton have been grown on some soils in the south for more than See also:forty successive years . The fibre takes almost nothing from the See also:land, and where the seeds are restored to the soil in some See also:form, even without other fertilizers, the exhaustion of the soil is very slow . If the burning-up of humus and the leaching of the soil could be prevented, there is no reason why a cotton soil should not produce good crops continuously for an indefinite time . Bedding up land previous to planting is almost universal . The See also:bed forms a warm seed-bed in the cool weather of early See also:spring, and holds the manure which is drilled in usually to better See also:advantage . The plants are generally See also:left 2 or 3 in. above the middle of the See also:row, which in four-See also:foot rows gives a slope of i in. to the foot, causing the plough to lean from the plants in cultivating, and thus to cut fewer roots . The plants are usually cut out with a See also:hoe from 8 to 14 in. apart . It seems to make little difference exactly what distance they are, so long as they are not wider apart on average land than r ft . On See also:rich bottom-land they should be more distant .
The seed is dropped from a planter, five or six seeds in a single See also:line, at See also:regular intervals ro to r 2 in. apart
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A narrow deep furrow is usually run immediately in advance of the planter, to break up the soil under the seed
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The only time the hoe is used is to thin out the cotton in the row; all the rest of the cultivation is by various forms of ploughs and so-called cultivators
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The question of deep and shallow culture has been much discussed among planters without any conclusion applicable to all soils being reached
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All grass and weeds must be kept down, and the crust must be broken after every rain, but these seem to be the only principles upon which all agree
.
The most effective See also:tool against the weeds is a broad See also:sharp " sweep," as it is called, which takes everything it meets, while going shallower than most ploughs
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Harrows and cultivators are used where there are few weeds, and the mulching See also:process is the one desired
.
The date of cotton-planting varies from See also: It may not begin until September ro in Piedmont, North Carolina . It is a peculiarity of the cotton-plant to lose a great many of its blooms and bolls . When the weather is not favourable at the fruiting See also:stage, the otherwise hardy cotton plant displays its great weakness in this way . It sheds its " forms " (as the buds are called), blooms, and even half-grown bolls in great See also:numbers . It has frequently been noted that even well-fertilized plants upon good soil will mature only 15 or 20% of the bolls produced . No means are known so far for preventing this great See also:waste . Experts are at an entire loss to form a correct idea of the cause, or to apply any effective remedy . Cotton-picking is at once the most difficult and most expensive operation in cotton production . It is paid for at the See also:rate of from 45 to 50 cents per cwt. of seed cotton . The work is light, andis effectually performed by See also:women and even See also:children, as well as men; but it is tedious and requires care . The picking season will average See also:ioo days . It is difficult to get the hands to work until the cotton is fully opened, and it is hard to induce them to pick over roo lb a See also:day, though some See also:expert hands are found in every cotton plantation who can pick twice as much . The loss resulting from careless work is very serious . The cotton falls out easily or is dropped . The careless gathering of dead leaves and twigs, and the soiling of the cotton by See also:earth or by the natural colouring See also:matter from the bolls, injure the quality . It has been commonly thought that the production of cotton in the south is limited by the amount that can be picked, but this limit is evidently very remote . The See also:negro See also:population of the towns and villages of the cotton country is usually available for a consider-able See also:share in cotton-picking . There is in the cotton states a rural population of over 7,000,000, more or less occupied in cotton-growing, and capable, at the See also:low average of roo lb a day, of picking daily nearly 500,000 See also:bales . It is evident, therefore, that if this number could work through the whole season of ioo days, they could pick three or four times as much cotton as the largest crop ever made . Great efforts have been made to devise cotton-picking See also:machines, but, as yet, See also:complete success has not been attained . Lowne's See also:machine is useful in specially wide-planted fields and when the ground is sufficiently hard . Cotton Ginning.—The crop having been picked, it has to be prepared for purpose of manufacture . This comprises separating the fibre or lint from the seeds, the operation being known as "ginning." When this has been accomplished the See also:weight of the crop is reduced to about one-third, each roo lb of seed cotton as picked yielding after ginning some 33 lb of lint and 66 lb of cotton seed . The actual amounts differ with different varieties, conditions of cultivation, methods of ginning, &c.; a recent estimate in the United States gives 35% of lint for Upland cotton and 25% for Sea Island cotton as more accurate . The separation of lint from seed is accomplished in various ways . The most See also:primitive is hand-picking, the fibre being laboriously pulled from off each seed, as still practised in parts of Africa . In modern commercial cotton production ginning machines are always used . Very See also:simple machines are used in some parts of Africa . The simplest cotton See also:gin in extensive use is the " churka," used from early times, and still largely employed in India and See also:China . It consists essentially of two rollers either both of See also:wood, or one of wood and one of See also:iron, geared to revolve in contact in opposite directions; the seed cotton is fed to the rollers, the lint is See also:drawn through, and the seed being unable to pass between the rollers is rejected . With this primitive machine, worked by hand, about 5 lb of lint is the daily output . In the Macarthy See also:roller gin, the lint, drawn by a roller covered with See also:leather (preferably See also:walrus hide), is drawn between a See also:metal See also:plate called the " See also:doctor " (fixed tangentially to the roller and very close to it) and a blade called the "beater" or See also:knife, which rapidly moves up and down immediately behind, and parallel to, the fixed plate . The lint is held by the roughness of the roller, and the blade of the knife or beater readily detaches the seed from the lint; the seed falls through a grid, while the lint passes over the roller to the other See also:side of the machine . A hand Macarthy roller gin worked by two men will clean about 4 to 6 lb of lint per See also:hour . A similar, but larger machine, requiring about 11 See also:horse-See also:power to run it, will turn out 50 to 6o lb of Egyptian or 6o to 8o lb of Sea Island cleaned cotton per hour . By simple modifications the Macarthy gin can be used for all kinds of cotton . Various attempts have been made to substitute a See also:comb for the knife or beater, and one of the latest productions is the " Universal fibre gin," in which a See also:series of See also:blunt combs working horizontally replace the solid beater and so-called knife of the Macarthy gin . Opposed to the various types of roller gins is the " saw gin," invented by See also:Eli See also:Whitney, an American, in 1792 . This machine, under various modifications, is employed for ginning the greater portion of the cotton grown in the Southern States of America . It consists essentially of a series of circular notched disks, the so-called saws, revolving between the interstices of an iron bed upon which the cotton is placed: the See also:teeth of the " saws " catch the lint and pull it off from the seeds, then a revolving See also:brush removes the detached lint from the saws, and creates sufficient See also:draught to carry the lint out of the machine to some distance . Saw gins do considerable damage to the fibre, but for short-stapled cotton they are largely used, owing to their great capacity . The average yield of lint per " saw " in the United States, when working under perfect conditions, is about 6 lb per hour . Some of the American ginners are very large indeed, a number (Bulletin of the See also:Bureau of the See also:Census on Cotton Production) being reported as containing on the average 1156 saws with an average production of 4r20 bales of cotton . Saw gins are not adapted to long-stapled cottons, such as Sea Island and Egyptian, which are generally ginned by machines of the Macarthy type . The machine which will gin the largest quantity in the shortest time is naturally preferred, unless such injury is occasioned as materially to diminish the market value of the cotton . This has sometimes been to the extent of rd. or zd. per lb and even more as regards Sea Island and other long-stapled cottons . The production, therefore, of the most perfect and efficient cotton-cleaning machinery is of importance alike to the planter and manufacturer . Baling.—The cotton leaves the ginning machine in a very loose See also:condition, and has to be compressed into bales for convenience of transport . Large baling presses are worked by See also:hydraulic power; the operation needs no special description . Bales from different countries vary greatly in See also:size, weight and appearance . The American See also:bale has been described in a standard American See also:book on cotton as " the clumsiest, dirtiest, most expensive and most wasteful package, in which cotton or any other commodity of like value is anywhere put up." Suggestions for its improvement, which if carried out would (it is estimated) result in a monetary saving of £r,000,000 annually, were made by the See also:Lancashire Private Cotton Investigation See also:Commission which visited the Southern States of America in 1906 . The approximate weights of some of the principal bales on the See also:English market are as follows: United States - . goo lb Indian . 400 lb Egyptian . 700 lb Peruvian . 200 lb Brazilian . . 200 to 300 lb With baling the work of the producer is concluded . Cultivation in Egypt.—Climatic conditions in Egypt differ radically from those in the United States, the rainfall being so small as to be quite insufficient for the needs of the plant, very little rain indeed falling in the See also:Nile See also:Delta during the whole growing season of the crop: yet Egypt is in order the third cotton-producing country of the world, elaborate See also:irrigation See also:works supplying the crop with the requisite water . The See also:area devoted to cotton in Egypt is about 1,800,000 acres, and nine-tenths of it is in the Nile Delta . The delta soil is typically a heavy, black, alluvial clay, very fertile, but difficult to work; admixture of See also:sand is beneficial, and the localities where this occurs yield the best cotton . Formerly in Egypt the cotton was treated as a perennial, but this practice has been generally abandoned, and fresh plants are raised from seed each See also:year, as in America; one great advantage is that more than one crop can thus be obtained each year . The following rotation is frequently adopted . It should be noted that in Egypt the year is divided into three seasons—winter, summer and " Nili." The two first explain themselves; Nili is the season in which the Nile overflows its See also:banks . Winter . Summer . Nili . First year . . See also:Clover Cotton See also:Corn or See also:fallow Second year Beans or See also:wheat .. For cotton cultivation the land is ploughed, carefully levelled, and then thrown up into ridges about 3 ft. apart . Channels formed at right angles to the cultivation ridges provide for the See also:access of water to the crop . The seeds,. previously soaked, are sown, usually in March, on the sides of the ridges, and the land watered . After the seedlings appear, thinning is completed in usually three successive hoeings, the plants being watered after t |