The agricultural and forest products of British West Africa

by Gerald C. Dudgeon

FIELD CROPS.—The soil is of a lighter and more sandy nature than that generally found in the forest region, but it is well adapted for the cultivation of many different kinds of crops, notably Guinea corn, millet, groundnuts, and cotton, while it is less satisfactory for yams. The latter are consequently of smaller size.

Cotton.—The cotton grown by the Dagombas is whiter than those found in the south, and the plants are of small stature; the species has a wide-opening pale flower, and has been grown at Labolabo from seed procured in the Northern Territories. The cotton fields are planted with regular lines of plants, and the ground appears to be exclusively used for the crop during the season. The seed is sown upon ridges which have been constructed from the high conical mounds, upon which the combined crop of millet (Pennisetum spp.) or Guinea corn and yams were grown in the previous year. Cultivation is performed by means of a short-handled hoe, and the ridges are kept clear of weeds and grass until the crop is ready. The seed-cotton is sold in the markets, and is in good demand for the manufacture of native cloths. No insect pests have been observed attacking the plants, and it is probable that if an outside demand were established for the produce a large quantity could be grown. It might be necessary to introduce a better variety than that at present cultivated, as this yields a rather coarse and short staple. If cotton from this part of the country is to become an article of export, the difficulties at present experienced in transport will first have to be overcome; indeed, this applies to all the produce capable of being grown in the country. The navigation of the Volta river and the two main branches seems to suggest a means which might be employed, for, although there are several rapids in the course from Daboya and Bole to Labolabo, only one is impassable for canoes, even in the dry season. This rapid is at Krachi where a short line has been laid for transporting loaded canoes. The cost of the hire of canoes for making the journey would probably be prohibitive, but if the British Cotton Growing Association undertook the carriage by their own canoes of the salt and stores required by the merchants who have commenced business in Yeji and Tamale, the freight on these in the journey upwards would probably be found to cover the cost of bringing cotton down-stream, and the export trade in it could be developed in this manner. The British Cotton Growing Association made an effort to act upon the suggestion made here, but discontinued their operations in July 1916, when they handed over their buildings, at Tamale, to the Government, as it was shown that under the existing conditions and with but one European representative to further its interests, cotton-growing in the Northern Territories could not hope to become a remunerative export business (Colonial Reports, Northern Territories, G.C. 1916, No. 956). The irregularity of the rainfall is a matter which must be borne in mind in any future attempts to develop the industry here, but the possibilities of providing artificial irrigation should not be overlooked, as large tracts of flat land exist near the White Volta river capable of becoming fertile under proper irrigation and drainage.

Other Field Crops.—Yams are grown as a primary crop on mounds, and three different kinds are common, probably referable to D. alata, D. sativa, and D. colocasiæfolia, the last being what is termed the water yam and the first the winged yam. Guinea corn is the most important food grain grown, but millet is sometimes planted. A red species of sorghum (S. guineensis, var. robustum) is cultivated on a small scale for use in staining leather, but is not used for food. Rice (Oryza sativa) is grown in the vicinity of the large rivers, but is said to suffer damage from elephants and hippopotami. The variety seems to be similar to the red rice grown in the Gambia and Sierra Leone. Very little maize is planted, but some is grown near Salaga. Cassava is only seen in the south near the forest boundary, and groundnuts are not plentiful, owing, perhaps, to the fact that cooking oil is obtainable from shea butter trees, which are common in a wild state. Pigeon peas are often planted round the borders of fields, and are left to yield more than one crop. This pea is identical with one of the common “Dhalls” of India (Cajanus indicus); the origin of the introduction is obscure. Small beans are grown as well as Indigofera spp. Sweet potatoes, okra, capsicum-peppers, sorrel-hibiscus (H. Sabdariffa), and the Fra-Fra potato (Plectranthus, sp., “Tumuku” of the Haussas) are also grown.

Fibre.—Plants belonging to two species of Hibiscus are used for the extraction of fibre for the preparation of cordage, the cleaned fibre being similar to jute. These plants grow, with perfectly straight stems, to eight or ten feet in height, bearing short thin branches with axillary flowers.

Tobacco.—The tobacco grown is used for smoking or the manufacture of snuff in many parts of the Northern Territories, and is prepared in a special manner. For smoking tobacco the green leaves are pressed into small gourds until a quantity of juice exudes, the mass being rolled in this until it assumes an oval form, in which it is sold in the markets before drying. For snuff it is ground up between heated stones until the requisite fineness has been obtained, and is then mixed with a small quantity of the powdered seeds of Monodora myristica. The tobacco fields are usually confined to small patches near houses, and wood ashes as well as sweepings are applied as a top dressing. This appears to be the only crop to which manure or fertiliser is given. The leaves always seem to be stripped off the stems at one operation, whereby old and immature leaves are mixed with mature.

GUMS.—Two species of Acacia (A. arabica and A. Sieberiana) are found, especially in the uninhabited tracts in the centre of the country, and the last named appears to yield a large flow of gum, which, however, is not collected. Examination of this at the Imperial Institute has shown it to be about equal in quality to inferior Sudan grades; A. arabica does not seem to yield gum with such frequency in this locality as elsewhere. Burkea africana and Pseudocedrela Kotschyi produce a quality of gum comparable with “Talh” from the Sudan. (Cf. Selected Reports from the Imperial Institute, Pt. II., Gums and Resins, pp. 153, 165-7.)

WOOD OIL.—By cutting deeply into the base of a tree known as “Neou” (Dagomba), and “Kawa” (Haussa), a rather copious flow of resinous liquid is induced, which, when solidified, is a resin somewhat similar, but inferior, to copal. The tree from which this is procured is botanically known as Daniellia thurifera, Oliv., and the so-called “oil” obtained was at one time shipped from Northern Nigeria under the name of African Balsam of Copaiba. It is used in the Northern Territories for lighting purposes, as well as medicinally. The tree yields a handsomely grained timber. (Cf. Bull. Imp. Inst., 1915.)

SHEA BUTTER.—A tree known botanically as Butyrospermum Parkii bears a fruit, from the kernel of which this valuable vegetable fat is procured. The fat forms the cooking oil of the ultra-forest country, taking the place of palm oil in this respect. The mode of preparation in the Northern Territories is, doubtless, similar to that employed in Northern Nigeria. The prepared butter is one of the products carried by the Haussa traders, who visit Ashanti for the purpose of purchasing kola, and is much appreciated in Kumassi, where it obtains a high price. A small quantity is carried down the Volta river by the canoes which bring salt from Adda to Yeji and Daboya. An analysis made at the Imperial Institute of Shea butter from the Northern Territories showed that the material is in no way inferior to the better-known “Shea butter” of Northern Nigeria. Cf. Bulletin of the Imperial Institute, vol. vi. (1908), p. 370.

RUBBER.—Recently some species of Landolphia were found growing in the district of Wa and elsewhere, and, upon examination, one of these proved to be L. owariensis, P. Beauv. This was at first thought to occur plentifully, and to assume the underground habits of L. Thollonii, one of the most important sources of root or rhizome rubber in the Congo. Specimens, which were found growing near the south bank of the Black Volta river, in grass land, exhibited a trailing form of growth owing to the absence of supporting trees, but, although the plants were probably dwarfed by the annual grass fires, no development of root growth was observed in excess of that ordinarily produced within the forests. The plant is now reported to occur rather rarely in the Northern Territories; another nearly allied, though useless, species having been mistaken for it.

DYES.—For dyeing the yarn made from the native cotton, indigo is made from a species of Indigofera, or from the young leaves of Lonchocarpus cyanescens, but the process of preparation employed in this country has not been carefully observed. It is, however, probably similar to that in common use in Sierra Leone, Northern Nigeria, and the Gambia.