Niger
by DIETER GEESING and HASSANE DJIBO |
| 5. THE
PASTURE RESOURCE Permanent pastures occupy approximately 60,000,000 ha in Niger and acquire their greatest extent in the Sahelian zone, the present Nigerien pastoral zone. The area of pastures is limited in the north by the semi-arid zone (100-mm isohyet) and to the south by the northern limit of agriculture, marked by the 350-mm isohyet. The location of the isohyets varies considerably from year to year. The ecological conditions make crop-raising a risky speculation, but are disposed towards livestock keeping, in spite of the variability of rainfall. Water is a key factor for survival and development, ensuring the growth of natural pastures and the maintenance of the domestic herds: more than 3,000 water points were listed within the pastoral territory (1970). Thus, in Niger, pastoral management is basically a question of management of water, i.e. how to balance the size of the herd with the watering capacity of the water points and the family labour available to satisfy the watering of the animals in the minimum time and the best possible conditions. The variability of rainfall involves unpredictability of fodder production, as much in space as for the food value of the pastures. Other factors also have to be taken into account, such as the influence of the selective grazing, natural and man-made fires and the way of exploitation of the pastures. The action of man can play a paramount role in the composition and structure of the vegetation by opening more or less the herbaceous soil protection, thus supporting or, on the contrary, limiting the growth of certain woody plants. Owing to the variability of rainfall, annuals are often more competitive, especially on sandy soils. While the availability of water plays a paramount role in the productivity of the pastures in the northern part of the Sahelian zone, it appears that soil fertility acts as a limiting factor in the southern part where there is a better water supply. Fodder availability varies according to area and in general increases from north to south. Forage in the Saharo-Sindian zone is often provided by perennials and supplemented by the irregular appearance of annuals induced by random precipitation. Only the transhumance of large herds of small ruminants and camels allows the rational exploitation of this sporadic vegetation (' acheb' of Touareg). Some Poaceae play a paramount role in livestock feed, like Panicum turgidum, Lasiurus scindicus, Chrysopogon plumulosus, Centropodia forskalii, Stipagrostis vulnerans and Stipagrostis acutiflora. Other annuals seem to be very significant: Schouwia thebaica (Brassicaceae), Citrullus colocynthis (Curcubitaceae) or Astragalus vogelii (Leguminoseae). Unlike the Ahaggar area of Algeria where the pastures contain numerous plants rich in salt, the Aïr has none. Touaregs lead their herds to the south-west of the massif where groups of stockmen meet at the time of the 'salt cure' (salt licks for the herds) in Ighazer, north of InGall. The salt grounds of this area are covered with a very dense herbaceous layer in the rainy season: Ipomoea verticillata (Convolvulaceae), a dominant species in the herbaceous carpet, is regarded as best fodder for the goats, sheep and dromedaries. The pastoral part of the Sahelian zone extends from West to East over 1,400 km
through Niger and reaches a width of 250 km. According to the rainfall and geomorphology,
the pastoral zone can be divided into three subzones: north, south and centre. On clayey soils an important plant formation is provided by Sorghum arundinaceum and Sporobolus helvolus which, in Ighazar (north of InGall), form immense pastures on salty land in the rainy season. The significant evaporation related to the endorheic water (internal drainage) has led to the accumulation of salts (sodium chloride and sulphate) in the surface layers of the soil. The very rich pasture on these grounds, is the cause of the gathering of many herds: it represents a true social rite at that time of the year, where the difficulties of the dry season disappear with the arrival of the rains. (There is a famous annual gathering of Touaregs and other Saharan nomads for a festival/reunion/market event at InGall, an oasis village two hours by road from Agadez. It is said to be one of the oldest and largest of such gatherings in the Sahara). This 'salt cure' (cure salée) is in fact a convalescence of the livestock after the long difficult months: a significant nutritious contribution of rock salt, a purgative action and intestinal worm cure for the animals. The central Sahelian zone is between the 100-mm isohyet in the north and the 200 - 350-mm isohyet in the south. Annuals prevail in this subzone, not only due to a low rainfall but also because of fire and grazing. The open woody layer consists mainly of various Acacia and the species mentioned in the preceding zone. On sandy soils, the herbaceous layer is now more or less continuous and the commonest plants are Panicum turgidum, a perennial, and annuals such as Aristida mutabilis, Cenchrus biflorus, Eragrostis tremula, Brachiaria xantholeuca and Schoenefeldia gracilis. Other families are represented with annual plants such as Indigofera spp., Blepharis linariifolia, Gisekia pharnacioides, Borreria spp., Mollugo spp. and others. The productivity of these pastures reaches 1-1.5 ton of dry matter / ha. On soils with higher clay and silt content, mostly in depressions, the distribution of species is more heterogeneous and the herbaceous layer consists mainly of Schoenefeldia gracilis, Aristida funiculata and Cymbopogon schoenanthus. The latter formations are very seasonal, they appear with a relatively high productivity at the beginning of the rainy season but they dry very fast at its end. The southern Sahelian subzone extends its border to the south until the northern limit of agriculture which corresponds to the 350-mm isohyet. It includes fallow land of former arable lands whose extension towards the north had once taken place in years of sufficient rainfall. Sandy soils on dunes or plateaux carry savanna formations of Mimosaceae and Combretaceae which show the traces of the degradations of the former extension of the agricultural land. Still, the grass layer contains a strong share of therophytes (annual plants that persevere in unfavourable climatic conditions as seeds) like Schoenefeldia gracilis, Aristida mutabilis and Cenchrus biflorus. The productivity of these pastures can exceed - depending on their floristic composition - two tons of dry matter per hectare. On soils with a higher clay and silt content, the grass cover does not differ very much from the one of the preceding central subzone. On hydromorphic soils - bordering Lake Chad - species such as Panicum repens, Panicum porphyrrhizos, Sporobolus spicatus and Sporobolus helvolus are dominant and on more sandy sites, Schoenefeldia gracilis and Echinochloa colona. They are excellent pastures that can be exploited during the whole year. The whole sedentary part of the Sahelian zone is occupied by agriculture, on the clayey as well as on the more sandy soils. Grazing is thus possible only from November after harvest or on fallow land: in both cases, it mainly benefits domestic herds. The floristic composition of the fallow lands varies with their age and their productivity but does not exceed one ton of dry matter / ha. First, fallows are invaded by annual Poaceae, but later productivity improves with an increasing number of perennials: Eragrostis tremula, Aristida mutabilis, Aristida funiculata are thus replaced by Andropogon gayanus, Aristida sieberiana, Cymbopogon schoenathus and Hyperthelia dissoluta. On ferralitic sandy soils of the savannas of the Sudanian zone, dominant plants of the grass layer are Panicum nigerense and Loudetia hordeiformis, on the slopes of the Dallol ('valley') Maouri Aristida mutabilis, Aristida sieberiana and on some isolated dunes Andropogon gayanus. These are found in company with Eragrostis tremula, Diheteropogon grandiflorus, Aristida stipoides, Cenchrus biflorus, Digitaria gayana and other grasses. On the more clayey soils of the wooded savannah along the Niger river, species such as Hyparrhenia involucrata, Hyparrhenia cyanescens, Brachiaria xantholeuca, Andropogon gayanus are found; on hydromorphic soils Hyperthelia dissoluta, Andropogon pseudapricus are frequent. On the plateaux, where we find the 'tiger bush' formation, the grass layer consists mainly of annuals such as Elionurus elegans, Andropogon pseudapricus, Andropogon fastigiatus, Pennisetum pedicellatum, Eragrostis tremula, Eragrostis pilosa, Dactyloctenium aegyptium, Aristida adscensionis, Schoenefeldia gracilis, Tripogon minimus, Brachiaria xantholeuca together with a few perennials that sometimes dominate: i.e. Loudetia simplex or Loxodera lermannii. The Niger riverbed and temporary ponds are locally important pastures. 'Bourgoutières' are pastures that are temporarily flooded by the Niger river. In Niger, the most important 'bourgoutières' are close to the Malian border. These formations are subjected to two annual floods: a first one ('white water') between mid-September and mid-October, and a second one ('black water') between mid-February and mid-March. Different types of bourgoutières can be distinguished: The borgoutières with Brachiaria mutica, the bourgoutières with Echinochloa stagnina (the 'bourgou'), and the bourgoutières with Oryza longistaminata and Echinocloa stagnina. As the 'white water' withdraws (mid-October), the animals enter the bourgoutières with Brachiaria mutica and leave them only in December. The dry stalks are then burned to make them resprout. The livestock then returns to these sites as soon as the 'black water' withdraws in March. The bourgoutière with Echinochloa stagnina is grazed later, in April, and the herds remain there until the arrival of the white water. The productivity of the bourgoutières is in general high: for the formations with Echinochloa stagnina, it varies from 6 to 17 tons of dry matter / ha (in Mali, it can reach 30-40 tons). Unfortunately, under the effect of water deficit due to climatic changes, overgrazing, the exploitation of grass tufts (the grass is used for fattening domestic animals which are then sold on the markets), extensive rice growing and cultivation of the river banks, one observes a clear regression of the bourgoutières and an evolution of their floristic composition which has led to a drastic reduction in the fodder resources. The fallow lands of the Sudanian area are, as per the fallow land of the Sahelian area, complementary fodder resources. At the beginning, the fallow land is dominated by Eragrostis tremula, associated with Ctenium elegans, Loudetia hordeiformis and Schizachyrium exile. They are later partly replaced by species such as Pennisetum pedicellatum and Diheteropogon hagerupii. The productivity of these fallows can be up to 4 tonnes of dry matter / ha. Table 2. Productivity and Carrying Capacity of Different Pastoral Zones
Fodder. For farmers, weeds cause more harm than good if not controlled, and weed control causes a labour peak in crop production. Howver, livestock plays a key role in the traditional household economy and various weeds are traded as feed, food or construction material. Especially in mixed-farming systems, in the rainy season, feed demands of animals can be satisfied by fresh grasses and herbaceous plants. At the onset of the dry season, animals prefer millet leaves and weeds to millet stalks. During the dry season, feed is mostly limited to the scarce biomass from natural pastures and the decomposition of stover. At rural markets, fodder weeds such as Alysicarpus ovalifolius, Zornia glochidiata (both Leguminoseae), Commelina forskalaei (Commelinaceae) or Eragrostis tremula (Poacea) are sold. Laboratory analyses of these weeds revealed a crude protein content twice that of low quality roughages such as millet stover. Livestock keepers show a preference for different weeds, such as Eragrostis tremula, Commelina forskalaei, Cenchrus biflorus (Poaceae) and Merremia tridentata (Convulvaceae), a perennial creeper. The grass Eragrostis tremula can be cut several times during the rainy period and is eaten by all animals. It can be ensiled (another use is broom production). Commelina forskalaei is a good fodder and suited for the preparation of silage. Under wet weeding conditions it regenerates fast. Both Eragrostis tremula and Commelina forskalaei emerge after the first weeding. Cenchrus biflorus is difficult to weed and rather persistent under humid conditions. It is grazed by most animals in its juvenile state and standing hay after the fall of the prickly spikelets. The fermentation process during ensiling softens the bristles which can subsequently be eaten by animals without harm. It is a reliable feed, since it persists until the next rainy period. Women gather Cenchrus biflorus seeds to prepare a porridge after cracking the seeds. Merremia tridentata is appreciated by all animals and remains on the grassland for about four months after the rainy period. It is well suited for preparing hay and silage. Further livestock diet improvement is attributed to Mitracarpus scaber (Rubiaceae) and Ceratotheca sesamoides (Pedaliaceae). They are not suitable for haymaking but for silage. The leaves of Ceratotheca sesamoides are used as a vegetable. Mitracarpus scaber remains green for about three months after the rainy season. In the Sahelian zone, most grasses are well consumed by animals; some are preferred to others. Generally, those that grow on humid ground have larger leaves and are more tender (e.g. Echinocloa colona, Panicum laetum). Some grasses are more or less 'ligneous' and are disdained, especially when dry (e.g. Aristida hordeacea, Elionurus elegans). In the north of the Sahelian zone, grasses such as Panicum turgidum, Stipagrostis vulnerans or Lasiurus scindicus are relished by all animals and sometimes taken as hay to feed the animals of the moving caravans. The degree of acceptance of weeds by animals depends on many factors such as season and
food scarcity. Under conditions of severe food shortage, even toxic plants are eaten,
especially by goats. While the biomass increases with the age of the plants, the fodder
value decreases sharply after stem elongation. During the dry season, the fodder value of
straw is low and has to be compensated by the consumption of leaves and fruits of trees. Table 3. Consumption of Fodder Trees
x = eaten , r = limited palatability, ? = no information, n = no consumption Table 4. The Nutrional Value of Fodder
CP = crude protein (gr / kg dry matter), OM = organic matter (gr / kg dry matter), C = cellulose (gr / kg dry matter), DM = dry matter (in % of fodder), DP = digestible protein (gr / kg dry matter), FU = feed unit (net energy for the milk productionfrom 1 kg of barley = 1700 kcal; generally 790 gr of digestible organic matter) Pastoral Water Resources. In the agropastoral zone of Niger, the water supply for livestock is provided by water points around villages where transhumant herds stay in the dry season. In the actual pastoral zone, which is north of the agropastoral zone, the most important source of water is from natural surface ponds. Since the 1950s , the network of traditional wells and artesian springs - estimated to be approximately 1,500 in the pastoral area - has been supplemented by cemented wells (approximately 350) and deep boreholes, in some cases even equipped with pumps. Thus, the theoretical needs of the livestock (180,000 m3 / day for 4,500,000 tropical livestock units (TLU)) are met. The actual problem is, however, the uneven distribution of the water points related to the forage potential of an area. In addition, the legal status of the water points is often unclear and they are frequently appropriated, or users do not meet the costs of maintenance. Droughts and Livestock Production. During the long period of drought (1969-1974), herds underwent very significant losses (50 percent of the cattle, 36 percent of the sheep, 27 percent of the goats). These losses, in cattle particularly, were more severe in the pastoral than in the agricultural zone, which increased the relative share of the herds of the south compared to those of north. During this period of droughts, Peulh nomads abandoned their usual course of migration, whereas Touareg clung to their spot thanks to their more diversified herds. The latter kept camels and goats, but lost almost all their cattle and sheep. In 1977, almost all the stockbreeders had regained their usual route. For the Peulh Woodabe it was an enormous detour, whereas only a few Touareg families had moved towards the cities or the food distribution centres. In 1981, the herds were reconstituted to 80 percent for the cattle and 110 percent for the small ruminants. The long period of droughts followed some better, but still rain-deficient, years that ended with the catastrophic season of 1984. This season of catastrophic rains showed at the end of its summer that the fodder resources would be unable to ensure the survival of the herds. The stockbreeders who had not forgotten the difficulties of the years 1972-1973, and encouraged by the administration, left the pastoral zone, in their great majority in October. This time, Touareg were also concerned. A few families remained with some dairy cattle. The stockbreeders and their herds moved 150 to 250 km southwards. The loss of animals was very high and the crisis caused major changes in the pastoral society: Droughts and Pasture Resources. Years of deficient rainfall, which has marked the whole Sahelian zone since 1968, have resulted in a reduction of the biomass and a modification of the floristic composition. In certain areas of Niger, the productivity of the pastures with Aristida mutabilis and Schoenefeldia gracilis fell 50 - 70 percent between 1968 and 1985. In Tedjira (north-east of Zinder), for example, before the droughts, the herbaceous layer was dominated by the perennial Cymbopogon giganteus which was very well consumed by livestock. The productivity of these pastures often exceeded 2.5 tons of dry matter / ha. Now, this plant has more or less disappeared and has been replaced by Aristida funiculata, a small annual with a productivity never reaching 300 to 400 kg dry matter / ha. The current aspect of the grasslands (steppes) of the pastoral zone does not resemble the aspect of the time before the long periods of drought. Generally, the number of species has declined and the floristic composition of the herbaceous layer has been modified, very often to the detriment of perennial grasses: Aristida sieberiana, Cymbopogon giganteus, Cymbopogon schoenanthus, Andropogon gayanus, Cyperus conglomerates regressed considerably, even almost disappeared. Other annual species such as Aristida mutabilis, Aristida funiculata or Schoenefeldia gracilis have been replaced by therophytes with a shorter life cycle and thus more resistant to irregular rainfall, such as Cenchrus biflorus. Some plants, however, became more competitive as others vanished, for example Tragus racemosus or Tribulus terrestris which are easily disseminated by animals due to bur-like seed-cases. These species are however, relished by animals, and thus their increasing appearance does not necessarily lower the fodder productivity. In the 'tiger bush' formations of the plateaus in the south-west of Niger, the dryness led to the disappearance of Andropogon gayanus and the development of certain species far less productive (i.e. Michrochloa indica, Tripogon minimus). Overgrazing sometimes left large areas bare and prevented annuals from recovering. For many kilometres around water points, overgrazing, trampling and excrement have caused the disappearance of totally natural vegetation. Man-made fire and extensive lopping of trees are other sources that exacerbated the decline in the fodder value of Nigerien pastures. |
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| 6. OPPORTUNITIES FOR IMPROVEMENT OF FODDER RESOURCES
Pastoral areas in Niger are shaped by an unstable balance between livestock and vegetation, and the animals are the first to suffer when this equilibrium is broken. Indigenous plants are adapted to survive periods of drought. On the other hand, livestock have a beneficial impact on many aspects of the Sahelian ecology, and may actually help improve pastureland and increase the diversity of flora by dropping different kinds of seed in their dung as they move from one area to the next. Range improvement and development in Niger is subject to various constraints. Irregular rainfall, for example, is a predominant reason for the failure of reseeding programmes. Experiences from other Sahelian countries (i.e. Mali) show that only a few perennial and annual legumes may survive the first dry season. Among the species are Alysicarpus ovalifolius, A. vaginatus, Macroptilium atropurpureum, Stylosanthes fruticosa, S. hamata and S. viscose. The establishment of woody browse species below the 400-mm isohyt is subject to similar constraints, although some encouraging results are reported with Bauhinia rufescens, Combretaceae, Piliostigma reticulatum, Ziziphus mauritiana, Prosopis ssp. and Acacia tortilis. The deferment of grazing for at least three years is essential for a successful establishment of newly sowed species and for the recovery of strongly grazed pastures. Since fencing is economically not feasible (although efficient, if not subject to theft), a legally supported rotating grazing management must be applied. Scarification of the soil surface for the re-establishment of some grasses (i.e. Schoenefeldia gracilis) has been successfully practiced in a few projects, but it is generally cost-prohibitive. The same economic constraints apply to firebreaks. Due to population growth and the sedentarization of former nomadic groups, agricultural land is encroaching upon pasturelands. This contributes to an overgrazing of the pastures and often results in land tenure disputes. In addition, according to legislation, pastoral areas are freely accessible and open to common use by pastoralists. Hence, a new concept of landownership and range management might be a considerable contribution to the improvement of Nigerien pastures. A new legislature has, however, to be based on a thorough study of the social links and the nomadic strategies of the pastoralists. A long-term security is in fact dependent on reciprocal arrangements and the capacity to move around, thus, ruling out the option of reserving fodder for one group while others go hungry in cases of serious shortage of fodder which are sometimes only limited to certain areas. Range development is also water development. The number and location of new wells have to be the result of a careful study of the carrying capacity of the surrounding pastures and the transhumant traditions. However, public wells, as a common good, are often overused since they do not belong to anybody and therefore, the transfer of the ownership and the maintenance of the wells to the traditional users has to be part of a comprehensive pasture management plan. In the Sudano-Sahelian ecoclimatic zone, overgrazing is due to the limited range of transhumance since livestock keeping is part of a sedentary agropastoral activity. However, due to higher rainfall, development strategies are more effective. Many trials showed a successful introduction of fodder plants such as Andropogon gayanus, Pennisetum pedicellatum, Cenchrus ciliaris, Alysicarpus glumaceus, Stylosanthes hamata, Macroptilium atropurpureum, M. lathyroides, Lablab purpureus and Vigna unguiculata (cowpea). The development scope of the introduction of these fodder plants is a nitrogen enrichment of the soil, the integration of crop and livestock husbandry and the countering of soil erosion. Further recommended action for this zone is the increase of agroforestry (i.e. Faidherbia albida) and intensive animal production (fattening). |
| 7. RESEARCH AND DEVELOPMENT ORGANIZATIONS AND PERSONNEL
Ministry of Animal Resources - Division of Financial and Administrative Affairs: Mme Mariama ISSOUFOU Tel.: (00227) 733132 - Division of Animal Health Dr. Seyni BOUBACAR (see below) and Dr. Abdou NABABA Tel.: (00227) 733184 - Division of Veterinary Laboratories Dr. Mayana SALISSOU Tel.: (00227) 732009 Education and Research. The Institut Pratique de Développement Rural (I.P.D.R.) at Kollo has two courses of vocational training, both basically intended for state employees. A two-year training for livestock technicians, and training for livestock production assistants. The latter course lasts four years for students that are recruited directly from school with a junior high school degree, or two years for livestock production technicians with three years of working experience, after an entrance test. At the Abdou Moumouni Dioffo University of Niamey, faculty of agronomy, students obtain the diploma of a technical engineer in agriculture. Students are high school graduates, and, after an entrance test, livestock production assistants. Many Nigerien students are also trained in neighbouring countries (Burkina Faso, Morocco, Nigeria, Senegal or Mali), in France or in the USA. Research is mainly conducted under the institutional frame of the National Institute of Agricultural Research of Niger (INRAN) and the above-mentioned university. The main areas of research in livestock science are fodder improvement, livestock nutrition and improved cattle breeds. Much of the research is financed by the Agency for Higher Education and Research of the French-speaking Communities (AUPELF-UREF), the Interstate University of Veterinary Medicine and Science at Dakar (EISMV) together with the French International Agricultural Research Cooperation Centre (CIRAD). Non Governmental Organisations and Contacts Organisation Nigérienne pour le Développement de l'Elevage (ONDEL), B.P. 1050, Niamey Promotion du Développement Rural (PDR), B.P. 11995, Niamey Association Nigérienne pour la Promotion Socio-Economique et Culturelle, B.P. 662 Niamey, Niger Association Nigérienne pour la Rédynamisation de l'Elevage au Niger (AREN), B.P. 12669, Niamey Association pour le Développement Agro-Pastoral (ADAP), B.P. 11412, Niamey Eleveur sans Frontières (ESF), B.P. 651, Niamey Amadou BOUREIMA, Environment Researcher at the department of geography, Abdou Moumouni Dioffo University of Niamey, Clepgeo@intnet.ne Dr. BAZO, Expert in animal production, faculty of agronomy, Abdou Moumouni Dioffo University of Niamey. Tel: (00227) 732290 Dr. Boulkassim SALIFOU, coordinator of the Panafrican Program for the Control of Animal Diseases, (PACE), Ministry of Animal Resources, B.P. 12198, Niamey. Tel: (00227) 738386, Fax: (00227) 738453 Boureima AMADOU, Statistical Service of the Ministry of Animal Resources, B.P. 12091, Niamey. Tel: (00227) 737296 Dendant ISSA, expert for agro-silvo-pastoralism, Ministry of Animal Resources, B.P. 12091 and 12241, Niamey Dr. DOUMA, National Institute of Agricultural Research of Niger (INRAN), B.P. 429, Niamey. Tel: (00227) 722070/722714 François ACHARD, Research Institute for Development (IRD, former, Orstom), B.P. 11416 Niamey. Tel: (00227) 753115 Dr. Idé TAHIROU, coordinator of the Natural Resources Management Project, B.P. 12946, Niamey. Tel: (00227) 752717 Sanoussi FODE CAMARA, expert in pastoralism at the Natural Forests Management Project (PAFN), B.P. 12677, Niamey Dr. Seyni BOUBACAR, Department of Animal Health, Ministry of Animal Resources, B.P. 12241, Niamey. Tel: (00227) 733184 LABOCEL, B.P. 485, Niamey. Tel: (00227)732009 Department of Veterinary Laboratories, Ministry of Animal Resources, B.P. 12241. Tel: (00227) 732009 and 741805 Department of Veterinary Clinics, Ministry of Animal Resources. Tel: (00227) 733581 |
| 8. REFERENCES
Bernus, E. , Hamidous, S.A. (Ed) .1980. Atlas du Niger. Editions Jeune Afrique. CIRAD/CTA. 1986. Atlas de l'Elevage et potentialités pastorales sahéliennes: Niger de Fabrègues, Bernard Peyre. 2001. Les Grandes Etapes de l'Elevage en Zone Pastorale au Niger et leurs Consequences Majeures. In: Tielkes, Schlecht, Hiernaux (Eds) Elevage et gestion de Parcours au Sahel, Implications pour le Développement. Verlag U.E. Grauer Djibo, Montagne, Geesing, Peltier, Touré. 1997. L'aménagement villageois sylvo-pastoral de la formation de brousse tachetée de Tientiergou. In: Fonctionnement et gestion des écosystèmes forestiers contractés sahéliens. John Libbey Eurotext Hohenheim. 2000. Atlas of natural and agronomic resources of Niger and Benin. University of Hohenheim. Le Houérou, H.N. 1989. The Grazing Land Ecosystems of the African Sahel. Springer-Verlag MAE. 2001. Ministère de l'Agriculture et de l'Elevage de la République du Niger. Services d'Analyse de la Politique Agricole et de la Coordination Statistique MAE. 1997. Revue du secteur rural du Niger - Cellule PASA-DEP. Ministère de l'Agriculture et de l'Elevage de la République du Niger. Payne, W.J.A., Hodges, J. 1997. Tropical Cattle. Blackwell Science Ltd Poilecot, Pierre. 1999. Les Poaceae du Niger. UICN/CIRAD. Boissiera 56 Rehm, Sigmund (Ed). 1989. Spezieller Pflanzenbau in den Tropen. Eugen Ulmer Verlag. Thébaud, Brigitte. 1988. Elevage et Développement au Niger. Bureau International du Travail. Geneva von Maydell, Hans-Jürgen. 1992. Arbres et arbustes du Sahel.GTZ, Verlag Margraf
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| 9. CONTACTS This profile was prepared in November/December
2001 by Dieter Geesing and Hassane Djibo; Dieter Geesing will also undertake periodic
updating. Contact details are: Dieter Geesing Lecturer and Researcher Department of Plant Science (Chair of Plant Nutrition) Technical University of Munich Am Hochanger 2 85350 Freising Germany Tel ++0049 8161 71 5264 Fax ++0049 8161 71 4500 E-mail < geesing@wzw.tum.de and dgeesing@yahoo.com Hassane Djibo Fax (00227) 72 37 55 [The profile was lightly edited by J.M. Suttie and S.G. Reynolds in December, 2001] |
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