b) Light sandy soils: prevalent in coastal areas and support grazing during rainy season. However, these soils dry quickly and are ill-suited to support forage.
c) Soils of granite/gneiss origin: poor quality soils for agriculture/livestock and common primarily in Mwanza and Tabora (mid-western Tanzania).
d) Red soils: very common throughout much of the central plateau red soils support grazing during the brief rainy seasons, with valuable herbage sustaining into the drier seasons.
Source: Ezilon.com
e) Ironstone soils: Found in western Tanzania (primarily Kagera, Kigoma and Sumbawanga) these poor and acidic soils can become productive with appropriate inputs, such as use of manure/fertilizers and mulching.
f) Mbuga black vertisols: Widespread soils that are essential as a source of grazing during dry seasons.
Climate. Tanzania’s terrestrial ecosystems represent a diverse range in elevation, precipitation, and soils. While average annual rainfall for most of the country is below 1,000 mm, precipitation across the country ranges from 200 mm/year to 2,000 mm/year. In southern and western Tanzania rainfall is predominantly unimodal, while in northern, eastern, and northern-coastal areas rainfall is largely bimodal. Arid grasslands and savannahs extending south from the border with Kenya receive between 400 to 600 mm of rainfall annually on average. In semi-arid areas, located in central and southeastern parts of Tanzania, rainfall averages 500 to 800 mm per year.
Agro-ecological zones. Tanzania has five primary agro-ecological zones: afro-alpine, humid to dry sub-humid, dry sub-humid to semi-arid, semi-arid, and arid.
a) Afro-alpine: afro-alpine ecotype comprises 1 percent of Tanzania’s total area. Afro-alpine ecotype presents above the forest line as moorland, grassland, or barren land. This ecotype offers limited potential or economic value outside of water catchment and tourism.
b) Humid to dry sub-humid: this ecotype comprises 9 percent of Tanzania’s total area. Humid to dry sub-humid ecotype includes forest-derived grasslands and bush with capacity to support forestry or heavy agriculture (e.g., pyrethrum or coffee).
c) Dry sub-humid to semi-arid: 30 percent of Tanzania’s total area is dry sub-humid to semi-arid. This ecotype has no forest potential, instead offering a variable cover of moist woodland, bush or savannah. Trees found in this ecotype are predominantly Brachystegia or Combretum. This zone has high agricultural potential, and large areas support significant grazing.
d) Semi-arid: 30 percent of Tanzania’s total area is semi-arid: The semi-arid ecotype offers limited crop potential limited to sisal or quick maturing cereals. Limitations to potential productive grazing in this ecotype include bush encroachment, leached soils, insufficient water resource and tsetse fly infestation.
e) Arid: 30 percent of Tanzania’s total area is arid ecotype: Arid lands are poorly suited to agriculture, except when fertile soils are present and run-on rainfall available. Pasture most commonly occupied by Commiphora, Acacia as well as perennial grasses (e.g. Cenchrus ciliaris and Chloris spp.)
Grassland savanna, woodland savanna, and bushland plant communities are all present in the arid and semi-arid northern and northwestern zones of Tanzania. The ecotype depends upon the soil type, rain-shadow effects, and other environmental factors. Woodland savannahs typically represent one of Africa’s most iconic ecosystems serving as World Heritage Sites and Biosphere Reserves such as Serengeti National Park and the Ngorongoro Conservation Area. These ecosystems are host to vast migrations of ungulates tracking the cyclical wet and dry seasons. and. The grass-dominated woodlands span approximately 25 million ha of northern and central Tanzania. As human population has increased, threats to the woodland savannas, such as agricultural expansion, poaching, and loss of tree cover have expanded. The grasslands support the annual migrations of blue wildebeest, plains zebra and Thomson’s gazelle, which travel between the Serengeti grasslands and the woodlands, and consist of almost two million animals. Volcanic and alluvial soils support these grassland ecosystems in the Serengeti and Ngorongoro crater areas. The Miombo woodlands cover approximately 40 percent of the land area in Tanzania. In western Tanzania, the Central Zambezian miombo woodlands are predominant; while inland from the coastal zone (in southern Tanzania) the Eastern miombo woodlands are found. The vegetation found in these woodlands is commonly dominated by trees of the legume subfamily though many other tree species are found as well. In dry woodlands, tree cover is about 20 percent while it reaches nearly 100 percent in wet miombo woodland. Dry season deciduous forests have adapted to the strong seasonal rainfall that occurs in the region. Miombo tree species are dependent upon root symbioses with mycorrhizal fungi as a means to extract nutrients such as phosphorus, as well as sufficient water, in highly-weathered, infertile soils.
Farming Systems.48 Tanzanian agriculture can be classified into ten farming systems, which have developed in response to the country’s agro-ecological zones:
Banana/Coffee/Horticulture system: located in Kagera, Kilimanjaro, Arusha, Kigoma and Mbeya regions; tree crops, intensive land use, volcanic soils with high fertility.
Maize/Legume system: Located in Rukwa, Ruvuma, Arusha, Kagera, Shinyanga, Iringa, Mbeya, Kigoma, Tabora, Tanga, Morogoro, Kahama, Biharamulo; shifting cultivation, maize and legumes, beans and groundnuts intercropped, coffee.
Cashew/Coconut/Cassava system: Located in coast region, eastern Lindi and Mtwara
Rice/Sugarcane system, and in alluvial river valleys; rice and sugarcane.
Sorghum/Bulrush Millet/Livestock system: Located in Sukumaland, Shinyanga and rural Mwanza; sorghum, millet, maize and cotton, oilseeds, rice.
Tea/Maize/Pyrethrum system: Located in Njombe and Mufindi districts in Iringa region; tea, maize, Irish potatoes, beans, wheat, pyrethrum, wattle trees, sunflower.
Cotton/Maize system: Located in Mwanza, Shinyanga, Kagera, Mara, Singida, Tabora and Kigoma, Morogoro, Coast, Mbeya, Tanga, Kilimanjaro, and Arusha. Atoxigenic strain technology was successfully applied in the US for this type of farming system. Horticulture-based system: Located in Lushoto district, Tanga region, Morogoro region, and Iringa rural in Iringa region; vegetables (cabbages, tomatoes, sweet pepper, cauliflower lettuce and indigenous vegetables), fruits, (pears, apples, plums, passion fruit, avocado), maize, coffee, Irish potatoes, tea, beans.
Wet Rice irrigated system: Located in river valleys and alluvial plains, Kilombero, Wami Valleys, Kilosa, Lower Kilimanjaro, Ulanga, Kyela, Usangu and Rufijin.
Pastoralist and Agro-pastoralist system: Located in semi-arid areas, Dodoma, Singida, parts of Mara and Arusha, Chunya districts, Mbeya and Igunga district in Tabora; characterized by livestock and simple cropping systems
Water Resources. While Tanzania does not have any major rivers it does serve as the origin for the Nile, Congo, and Zambezi rivers, which flow to the Mediterranean Sea, the Atlantic Ocean and the Indian Ocean respectively. These watersheds are separated by the Central Plateau, an area that sits between the eastern and western branches of the Rift Valley. The main rivers of Tanzania - the Ruvuma, Rufiji, Wami and Pangani – all run to the Indian Ocean. Minor rivers predominantly flow into depressions formed throughout the Rift Valley. Total renewable water resources are estimated at 93 cubic kilometers per year (km3/year), from which 84 km3/yr are internally produced, and 9 km3/yr come from the Ruvuma River, which flows between Tanzania and Mozambique. Renewable ground water resources are estimated at 30 km3/year. Tanzania also has three lakes that form the borders to neighboring countries: Lake Victoria, Lake Tanganyika, and Lake Malawi, which cover 5.7 percent of the total land area of Tanzania.
Institutional Framework
Figure 1: Institutional Framework, Tanzania
The Agricultural Sector Lead Ministries include Ministry of Agriculture, Food Security and Cooperatives (MAFC), Ministry of Livestock Development and Fisheries (MLDF), Ministry of Industries, Trade and Marketing (MITM), Ministry of Water and Irrigation (MoWI) and the Prime Minister's Office, Regional Administration and Local Government (PMO-RALG).49
Agricultural Research Institutions. The Commission for Science and Technology (COSTECH) coordinates all science and technology policy and research agencies in Tanzania, including the agricultural sector. COSTECH is a parastatal organization that is a chief advisor to the Government on all matters pertaining to science and technology and their application to the socio-economic development of the country.50
The Division of Research and Development (DRD) of MAFC is the leading National Agricultural Research System (NARS) institution in Tanzania with the mandate to oversee all matters related to agricultural research. It comprises a network of sixteen agricultural research centers located in seven agro-ecological zones.
The research centers include Ilonga, KATRIN, Dakawa/Cholima, Kibaha, Mlingano and Mikocheni (Eastern Zone); Maktupora and Hombolo (Central Zone); Ukiriguru and Maruku (Lake Zone); Selian and HORTI-Tengeru (Northern Zone); Naliendele (Southern Zone); Uyole and Kifyulilo (Southern Highlands Zone) and Tumbi (Western Zone).
The main functions of the DRD are (i) to conduct and co-ordinate agricultural research programs in Tanzania in accordance with the national agricultural policy and research priorities; (ii) to recommend the use of research findings; (iii) in collaboration with extension services, to make sure that the research recommendations reach the farming community, especially smallholder farmers; and (iv) to collaborate with other related national, regional and international research institutions.51
Department of Research, Training, and Extension (DRTE) under the Ministry of Livestock Development and Fisheries (MLDF) is another government sponsored research agency. Together with DRF of MAFC they account well over half of the country’s agricultural research expenditures and staffing.52
Three additional government agencies conduct agricultural research in Tanzania: the Tanzania Fisheries Research Institute (TAFIRI), the Tanzania Forestry Research Institute (TAFORI) and the Tropical Pesticide Research Institute (TPRI).
Universities. Growth in the higher education sector has strengthened the roles of the Sokoine University of Agriculture (SUA) and the University of Dar Es Salaam (UDSM) in conducting public agricultural R&D.53 The Nelson Mandela African Institute of Science and Technology in Arusha is being developed into a research-intensive institution for postgraduate and post-doctoral studies and research in Science, Engineering and Technology. Tropical Pesticide Research Institute (TPRI) conducts pests and pesticide research and provides training and services in human, animal, plant and ecosystem hygiene, and health and safety. The semi-autonomous institute operates through MAFC. TPRI’s research, training, and services are multi- disciplinary. TPRI was established by Act of Parliament No. 18 of 1979 with a mandate to undertake, promote, evaluate and disseminate findings on the management of pests, pesticides and biological diversity. TPRI is located in Arusha.
TPRI has basic infrastructure for undertaking specialized pest, pesticides and biological research, training and services. Infrastructure for analysis of pesticide residues for environmental, toxicological, agro-product safety and for quality control includes High Performance Liquid Chromatography (HPLC), Gas Chromatography (GC), Atomic Absorption Spectrometer (AAS) and UV-Visible spectrometer. Facilities for research on pest behavior, biology and ecology include laboratories, pest colonies, animals, experimental rooms, controlled chambers, semi-field trial facilities and field experimental huts.54
TPRI has the responsibility for pesticides management and control including registration quality and potency verification and surveillance. To that effect, TPRI has an established pesticides control and registration systems that are governed by the Plant Protection Regulations (1998).
Organizations or individuals seeking to import or introduce pesticides to the Tanzanian market must formally apply to the Registrar of Pesticides. As a follow up to the application, appropriate documents including dossier and draft of the label (in both English and Kiswahili) must be submitted to the Registrar of Pesticides.
When approval is granted to proceed to the next stage, three samples of product are submitted. Two of the samples are submitted for field trials and one sample is submitted for laboratory qualitative and quantitative verification. Duration of verification trials depends upon the number of agricultural seasons needed for the field trials and may take up to three years. The results of field trials and laboratory reports are submitted to the Registrar of Pesticides. The Registrar submits the report to the pesticides registration technical committee, Pesticide Approval and Registration Technical Sub-committee (PARTS).
PARTS is a sub-committee to the National Plant Protection Advisory Committee (NPPAC) established under Section 31 of the Act. The NPPAC consists of representatives from relevant Departments of Government responsible for agriculture, health, environment, natural resources, justice and finance. The committee can include representatives from institutions of higher learning and international and national organizations and private sector.
Biological control agents addressed by Part III of the regulation are reviewed by the Biological Control Agents Subcommittee (BCAS). BCAS consists of the Inspector in-charge that acts as a Secretary to the sub-committee, the Registrar, the representative from the Ministry responsible for environmental management, representative from the Department responsible for plant health of the Sokoine University of Agriculture (SUA), and a representative of the post-entry Quarantine Station if the bio-control agent was imported into the country.55
Ministry of Environment. Several structures have been set up within the Ministry of Environment (MoE) to administer the Environmental Management Act, No 20 of 2004; include:
The National Environment Management Council (NEMC)
The National Environmental Advisory Committee (NEAC)
The Directorate of Environment (DoE); and
NEMC undertakes the enforcement, compliance, review and monitoring of Environmental Impact Assessments (EIA), including facilitation of public participation processes in environmental decision-making.56 NEMC was initially established in 1983 by the National Environment Management Council Act, No 19 of 1983. Its composition, powers and functions have been rearticulated by Part III(d) of the Environmental Management Act of 2004.
The NEAC is an advisory body to the Minister on all matters relating to the protection and management of the environment and environmental degradation. The Director of Environment (DoE) within the Ministry has coordination, promotion and advisory functions.
Ministry of Health and Social Welfare formulates health and social welfare policies and is monitoring and evaluating their implementation. It provides guidance and advice on occupational health and train experts on Occupational Safety and Health (OSH).
Tanzania Food and Nutrition Centre is a semi-autonomous government institution under the Ministry of Health and Social Welfare, established by Tanzania Food and Nutrition Act Number 24 of 1973 and amended by Act 3 of 1995.57 The Centre provides technical advice on formulation of complementary foods that use raw materials prone to contamination by aflatoxins.58
Ministry of Labour and Employment plays oversight role, monitoring and evaluation roles of OHS issues, the provision of resources for OSH to operate optimally.59
Tanzania Bureau of Standards (TBS) was established under the Ministry of Industry and Trade by an Act of Parliament, the Standards Act No.3 of 1975 as the National Standards Institute and became operational in April 1976. The functions of TBS include:
Formulate and promulgate Tanzania standards in all sectors of the country’s economy.
Undertake the testing of product samples drawn by providing facilities for the examination and testing.
Implement the promulgated standards through a third party.
Certification Schemes, i.e. approve, register, and control the use of “brands” or markers to indicate standard or quality.
To undertake calibration of industrial and commercial measuring equipment and instruments in the areas of mass, length, volume, energy, temperature
Tanzania Standards and Codes of Practice developed by TBS are the primary standards for the control of aflatoxins in foods and feed. Due to lack of reliable data on levels of aflatoxins in foods consumed locally, TBS adopts/adapts existing and relevant Codex60 Codes of Practice and standards for Prevention and Elimination of aflatoxins. All Tanzania new and revised food standards have the maximum limits for aflatoxins as:
Aflatoxin B1: 5 ppb
Baby foods: Total Aflatoxins: 5 ppb; Aflatoxin B1: 1 ppb 61
Notably, the standard for aflatoxins in the European Union is 4 ppb and in the U.S. it is 20 ppb.
Government Chemist Laboratory Agency (GCLA). The Government Chemist Laboratory is the “Legal Referral Laboratory.” It is a semi-autonomous Executive Agency with a commercial orientation. As an Executive Agency, the laboratory aims to meet the requirements of its customers and the public in general. It was established in 1895 under the Ministry of Health.62
The Tanzania Food and Drug Authority (TFDA) regulates the promotion of food, drugs, cosmetics, and medical devices. It carries out laboratory analysis to ascertain the quality, safety and effectiveness of food, drugs, herbal drugs, cosmetics and medical devices manufactured or imported into Tanzania. The results obtained are useful for decision-making. Tanzania Food, Drugs and cosmetics, Act No 1 of 2003, Section 14, assigns legal power to the TFDA laboratory. TFDA continually monitors safety of food, drugs, herbal drugs, cosmetics and medical devices available on the Tanzanian market and controls their import and export in order to ensure their safety, quality and effectiveness. The Directorate of Inspection and Surveillance is responsible with ensuring that all trade in food, drugs, herbal drugs, cosmetics and medical devices occur after obtaining relevant licenses and permits. The TFDA evaluates and registers drugs, pre-packaged food, cosmetics, herbal drugs, medical devices and food supplements prior to approval for distribution and marketing. The public education section is responsible for marketing TFDA and its activities through educating and informing stakeholders on all issues related to institution’s functions such as control of the quality, safety and rational use of drugs, food, herbal drugs, cosmetics and medical devices. TFDA has five regional offices.63
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