Tamado Tana

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• Doctor of Philosophy
• Professor at University of Eswatini

Sorghum is a key cereal in Rwanda, ranking second after maize. However, climate change, pests, and diseases contribute to low yields. To improve its yield, a study was conducted in the central plateau zone of Rwanda to evaluate the genetic diversity of 36 sorghum genotypes based on qualitative traits for the identification of drought-tolerant genot...

Analyzing past and future temperatures in countries like Ethiopia is crucial for multiple reasons, such as the country's Gross domestic product reliance on rainfed agriculture, its vulnerability to climate change, and its diverse ecosystems. Our recent publication explains it.

Rain-based agriculture is highly vulnerable to climate variability and change. Farmers’ decisions about how to adapt to climate change are influenced by socioeconomic setups and local institutions. The objectives of this study were to evaluate farmers' perceptions of climate change, identify the local adaptation techniques they used, and pinpoint t...

In sub-Saharan Africa, the parasitic Alectra vogelii is seriously threatening Bambara groundnuts, farmers to suffer yield losses of up to 100 %. The objective of this study was to determine the effects of phosphorus (P) application and Alectra vogelii inoculation on Bambara groundnut genotypes for growth and reproductive phrase. The experiment was...

Sorghum has the largest share of cultivated land for cereal crops in Rwanda, but the productivity is low due to many constraints, including drought stress and the unavailability of adaptable cultivars with high yields. However, direct selection of genotypes for yield might not be successful since yield is a complex trait controlled by many genes an...

Bambara groundnuts (Vigna subterranea (L.) Verdc) provide essential proteins for African farmers, but the yield is largely affected by Alectra vogelii infestation, particularly on nutrient-depleted soils. Laboratory and field investigations were conducted to assess the influence of phosphorus rates and Bambara groundnut genotypes on Alectra vogelii...

Climate change poses challenges to maize production and productivity in eastern Ethiopia. Impact assessment using climate predictions is the prime step to design adaptation strategies. Crop Environment Resource Synthesis (CERES)-Maize model in DSSAT (Decision Support System for Agrotechnology Transfer) was calibrated using GenCalc software. The mod...

Soil nutrient depletion is a major problem constraining maize production in Ethiopia. Therefore, research was conducted to assess the fertility status of the soils in Ambo and Toke-Kutaye districts in central highland of Ethiopia during the 2022 cropping season. One hundred and ten surface (0–30 cm depth) and sub-surface (30–60 cm depth) soil sampl...

Climate change is causing significant damage to crop production in the central plateau zone of Rwanda, particularly affecting sorghum, food, and the incomes of smallholder farmers. Understanding farmers’ perceptions and the factors impacting their responses is crucial for improving sorghum production policies and programs. Therefore, a study was co...

Efficient propagation of enset (Ensete ventricosum, Musaceae), an Ethiopian drought tolerant, multipurpose, indigenous starch crop Laila M Karlsson, Abitew Lagibo Dalbato, Tamado Tana, Mikias Yeshitila Haile, Abraham Bosha, Bizuayehu Tesfaye, Wassu Mohammed ABSTRACT In Ethiopia, enset has been utilised as food, fodder, fibre, and traditional med...

Water and nutrients are the most constraining factors in sorghum production in semiarids of eastern Ethiopia. Combining soil moisture conservation and nutrient management practices may reduce these limitations. The study was carried out to explore the effects of combining soil moisture preservation and integrated nutrient management practices on so...

Soil acidity and scarcity of faba bean varieties adapted to lower pH soils are major factors that limit faba bean production in Ethiopia. Therefore, an experiment was conducted to find the lime rate and faba bean can improve the yield of the crop. Four rates of lime (0, 2, 4, and 6 t ha–1) and five-faba bean varieties (local, Dosha, Gebelecho, Tums...

Soil fertility problem is a major constraint to faba bean production in Wolaita Zone in Ethiopia. Hence, a field experiment was conducted in Kokate Marachare sub-district during 2019 and 2020 cropping seasons to determine the optimum N, P, and K fertilizers for enhanced uptake and use efficiency of faba bean. Three rates of N (0, 23, and 46 kg N ha...

Low soil moisture content and soil fertility are the major problems constraining productivity of potato (Solanum tuberosum L.) in the eastern highlands of Ethiopia. Therefore, a field experiment was conducted to investigate the effect of drip irrigation regimes and fertilizer rates on tuber yield, as well as nitrogen, phosphorus, and water use effi...

A root holo-parasite, crenate broomrape (Orobanche crenata Forskal) becomes a major threat for faba bean (Vicia faba L.) production in northern highlands of Ethiopia. Information on distribution and problem of crenate broomrape can help to design suitable management options to reduce its negative impact in already infested areas and further spread...

Chemical ripening is a promising technology at Metahara and Kessem sugarcane plantations where conditions are not optimal for natural ripening in the early and late period of sugarcane processing. However, the harvest age at which sucrose yield could be maximized with application of ripeners has not been established. Thus, field experiments were co...

Poor quality of irrigation water and soil are among the major factors determining maize productivity in Ethiopia. This study assessed and evaluated the quality of irrigation water and soil under maize production in Soke and Woybo irrigation schemes in Boloso Sore district, Ethiopia. Four water samples per site per season were collected from the fir...

Efficient maize-faba bean intercropping system for optimum grain yield and productivity is needed in order to use the limited land and to enhance food security of the smallholder farmers. A field experiment was conducted at Haramaya, eastern Ethiopia during the 2018 and 2019 main cropping seasons to determine the effect of variety and spatial arran...

Groundnut root rot is a complex disease affecting the crop production worldwide. The objectives of this study were to: (1) Assess the occurrence and distribution of groundnut root rot complex in four main groundnut-growing areas of eastern Ethiopia; (2) Identify the major pathogens associated with groundnut root rot complex; and (3) Determine the r...

Sustainable development needs climate-smart food production systems. This study examined maize responses to irrigation levels of 70, 85, and 100% crop evapotranspiration (ETc) and blended fertilizer rates of 0, 50, 100, and 150 kg ha-1, in factorial combinations. Blended fertilizer contains nitrogen, phosphorus, sulfur, and boron (NPSB). A field ex...

Maize (Zea mays)-faba bean (Vicia faba) intercropping is a recent practice in eastern Ethiopia and there is limited information on optimum planting density and suitable varieties of faba bean for productive intercropping with maize. Therefore, a field experiment was conducted in eastern Ethiopia during the 2018 and 2019 main cropping seasons to det...

Information on the diversity of landraces is necessary to improve crops through selection or hybridization. This study was conducted to show the diversity of fenugreek landraces and associated traits. A total of 160 accessions including one local and four improved standard checks were evaluated in an augmented block design at the Haramaya Universit...

In Ethiopia, rice productivity varies over locations. However, there is limited understanding about rice yield drivers for design appropriate policies and strategies to enhance rice productivity. This study focuses on assessing the patterns of rice yield and its drivers. Data were collected from 220 households and field measurements were made accor...

Ethiopia is considered as the secondary centre of faba bean diversity. However, the extent of its diversity at present time is not well known in the eastern Hararghe Zone. Therefore, survey study was conducted from December 2018 to March 2019 to identify patterns of on-farm diversity of faba bean farmers’ varieties and their use; and to assess prod...

Groundnut (Arachis hypogaea L.) is a high economic value oil crop commonly grown in low-land semi-arid areas of Ethiopia. The crop production is constrained by low soil fertility; however, the nutrient management practice has been given low attention. This study was therefore conducted during the main cropping season of 2015/2016 at Babile and Fedi...

Common bacterial blight (CBB) caused by Xanthomonas axonopodis pv. phaseoli is the most important biotic production constraints to common bean in eastern Ethiopia. Climate change could have an impact on the disease epidemiology of CBB by influencing both common bean growth and the pathogen reproduction. The effects of climate change needs to be mit...

Climate change is a global phenomenon but disproportionately affects smallholder farmers, prompting them to use various coping and adaptation strategies to counter the problem. This study aimed to examine the trends of climate parameters, assess farmers’ perception of climate change, and identify the strategies of adaptation measures in central Eth...

The relatively high temperature at Kessem sugarcane plantation in Ethiopia was hypothesized to justify the implementation of chemical ripeners as a strategic intervention to combat poor cane quality. Accordingly, a field experiment was carried out to assess the responsiveness of four sugarcane varieties (B52-298, NCo334, C86-12, and SP70-1284) to f...

Irrigation enhances resilience to the negative impacts of climate change through sustainable food production and environmental health. However, water is a scarce resource that needs efficient utilization. This study explored (1) farmers’ perceptions about the roles of irrigation in climate change adaptation and (2) determinants of the choices to se...

A field experiment was conducted to determine the effects of intra-row spacing and nitrogen fertilizer rates on yield, yield components and bulb quality of leek at Areka Agricultural Research Centre, Woliata Zone. Treatments comprised of five nitrogen levels (0, 69, 92,115 and 138 kg ha-1) and three intra row spacing levels (5 cm, 10 cm and 15 cm)w...

Crenate broomrape, Orobanche crenata Forskal belongs to the family Orobanchaceae. It is a root holoparasitic weed devoid of chlorophyll and entirely dependent on host plants for its growth requirement. This parasite considerably infects plant species of the families Leguminosae, Apiaceae, and Asteraceae in highly infested drier and warmer areas of...

Poor soil fertility is among the major factors that limit faba bean production in Wolaita Zone in southern Ethiopia. Therefore, a field experiment was conducted in the Kokate Marachare subdistrict of Sodo Zuria District of the zone during the 2019 and 2020 cropping seasons to determine the response of faba bean to different rates of nitrogen (N), p...

Climatic calamities are posing serious challenges to smallholder maize (Zea mays L.) farmers in Ethiopia. Adapting to climate change is mostly location-specific, and its effectiveness depends on local institutions and socioeconomic settings. This study was conducted to elucidate maize farmers’ perceptions of climate change; to investigate its impac...

Interaction effect of variety by cropping system is expected to be arising from morphological features of component crops thus Selection of compatible varieties of component crops can increase productivity of intercropping systems. Hence, a field experiment was carried out at two locations to identify the best compatible varieties of maize and mung...

Smallholder farmers in East and West Hararghe zones, Ethiopia frequently face problems of climate extremes. Knowledge of past and projected climate change and variability at local and regional scales can help develop adaptation measures. A study was therefore conducted to investigate the spatio-temporal dynamics of rainfall and temperature in the p...

Ethiopia is considered as the secondary centre of faba bean diversity. However, the extent of its diversity at present time is not well known in the eastern Hararghe Zone. Therefore, survey study was conducted from December 2018 to March 2019 to identify patterns of on-farm diversity of faba bean farmers’ varieties and their use; and to assess prod...

In Ethiopia, acidity-related soil fertility problems are the main production constraints, reducing productivity of major crops grown in the country. The experiment was carried out to determine influence of Blended NPS fertilizer, Seed Inoculation with Rhizobium Bacteria and Vermicompost (VC) application on soybean nodulation and yield of soybean. F...

Faba bean is an important food security crop in Southern Ethiopia. Understanding the soil fertility management practices of faba bean farmers could aid in finding a method to replenish soil fertility. However, information on the type and extent of soil fertility management practiced by smallholder faba bean farmers is scarce. Therefore, a study was...

Climate change and variability is affecting maize (Zea mays L.) production in eastern Ethiopia but how farmers perceive the challenge and respond to it is not well documented. A study was conducted to analyze smallholder maize farmers’ perception of climate change/variability and identify their adaptation approaches and barriers for adaptation in t...

Meteorological stations, mainly located in developing countries, have gigantic missing values in the climate dataset (rainfall and temperature). Ignoring the missing values from analyses has been used as a technique to manage it. However, it leads to partial and biased results in data analyses. Instead, filling the data gaps using the reference dat...

Okra is a nutritious summer vegetable crop in Eswatini. However, it has slow and uneven germination. Seed pre-sowing treatment through osmo-priming can enhance the germination, growth and yield of okra. Thus, laboratory and field experiments were conducted at Luyengo, Middleveld of Eswatini in 2019/2020 cropping season to determine the effect of os...

Low soil fertility and climate change-induced low soil moisture are major problems constraining potato (Solanum tuberosum L.) production in the eastern highlands of Ethiopia. Climate events are projected to become more pervasive. Therefore, research was conducted with the objective of analyzing smallholder potato farmers' adaptation strategies to c...

Wonji-Shoa and Metahara sugarcane plantations experience reduced sucrose content (%) during the starting period of sugarcane crushing due to the combined influence of high (>27°C) temperature and the presence of high residual soil moisture. Studies elsewhere showed the potential of chemical ripeners in boosting the sucrose content (%), where natura...

Weeds reduce the yield and quality of faba bean if they are left unmanaged. Therefore, a field experiment was conducted using the faba bean variety Gachena (EH91001-13-2) as a test crop under rain fed conditions at Haramaya, eastern Ethiopia, during 2017 main cropping season with the objective to determine the critical period of weed competition in...

Soil acidity and poor soil fertility are the major soil chemical constraints which limit crop productivity in western Ethiopia. In leguminous crops, low productivity is not only a result of declining soil fertility but also reduced N2 fixation due to biological and environmental factors. Thus, this study was carried out to determine the influence o...

Potato (Solanum tuberosum L.) is a major cash crop in the eastern highlands of Ethiopia owing to the cooler and moist climate in the region. Climate variability threatens potato production since variations in rainfall patterns and temperature lead to severe moisture as well as other abiotic and biotic stresses for the crop. Therefore, we conduc...

Groundnut is an important food and cash crop for smallholder farmers in Eswatini. However, its yield is very low partly due to poor soil fertility particularly calcium and phosphorus deficiencies associated with soil acidity. Thus, a field experiment was conducted to determine the effects of different inorganic fertiliser types on growth and yield...

A terminal dry spell is one of the main limiting factors for rice productions. Therefore, this study was conducted to assess the effect of supplemental irrigation for managing the impact of terminal dry spells on the productivity of different rice varieties grown under rainfed conditions in the Fogera Plain. The experiment was designed in a split-p...

Common bean ( Phaseolus vulgaris L . ) is an important source of food and income. However, its on-farm diversity and conservation by smallholder farmers is not known in the east Hararghe Zone of eastern Ethiopia. Thus, field survey was conducted from November 2018 to February 2019 to assess the on-farm diversity, cropping system and the role of gen...

Shortage of improved varieties and soil nutrient depletion are the major production constraints of fenugreek in mid-altitude of Bale Zone in Ethiopia. Therefore, an on-farm experiment was conducted at Ginir, southeastern Ethiopia, to assess the effect of NPS fertilizer rates on growth and, yield components and seed yield of fenugreek varieties. Fac...

Understanding the soil fertility management practices is indispensable to improve faba bean productivity. However, little effort has been made to assess the soil fertility management practices of faba bean producing farmers of Wolaita Zone, southern Ethiopia. The study was conducted in Damot Gale and Sodo Zuria districts in Wolaita Zone to assess f...

Background: The shortage of quality seed is the major limiting factor of onion production in the study area. Inappropriate use of NP fertilizers and plant spacing is the major source of the problem. Objective: The experiment was conducted to determine optimum plant spacing and NP fertilizer for high yield and quality seed production of onion. Metho...

The study proved the agronomic and economic feasibility of double intercropping of common bean with maize under small holder farming system of eastern Ethiopia

Mung bean has become an important cash and food crop in dry land areas of Ethiopia. However, there is no sufficient research information on the nitrogen (N) and phosphorus (P) fertilizers rates for the crop in the study area. Thus, field experiment was conducted to determine the effects of N and P fertilizer rates on growth, yield components and yi...

NPSB) ማዳበሪያ መጠን በተመረጡ የዱረም ስንዴ ዝርያዎች ምርት እና ጥራት ላይ ያለውን ውጤት ለማወቅ የመስክ ሙከራ ተደርጓል፡፡ አራት የNPSB ድብልቅ የማዳበሪያ መጠኖች (0፣ 61፣122፣ 183 ኪ.ግ. በሄክታር) እና አራት የተሻሻሉ ዱረም ስንዴ ዝርያዎች (አለምጤና፣ ማንጉዶ፣ ኡዴ እና ኡቱባ) በጥምረት ሙከራ ተደርጓል፡፡ በሁሉም መደቦች ላይ 46 ኪ.ግ. የናይትሮጂን ማዳበሪያ በሄክታር ተጨምሯል፡፡ ከተሞከሩ ዝርያዎች መካከል ማንጉዶ ከፍተኛውን የእህል ምርት (2682 ኪ.ግ./ሄ)፣ የአንድ ሺህ ዘር ክብደት (44.7 ግራም)፣ የፕሮቲን ይዘት (11...

Climate constitutes a complex set of interrelated elements and its variability induces climate shocks; thus, leading to crop failures. The objective of this study was to analyze rainfall variability and extremes and investigate the effects on wheat and barley productivity at selected sites in Central Ethiopia. Standardized rainfall anomaly index, r...

A field experiment was conducted to assess the effect of rates and time of nitrogen fertilizer application on yield and yield components of sorghum in northern Ethiopia. The treatments consisted of four rates of nitrogen (23, 46, 69 and 92 kg N ha-1) and three time of N application (1/2 dose at sowing and 1/2 dose at mid-vegetative, 1/2 dose at mid...

In Ethiopia, enset (Ensete ventricosum, Musaceae) has been utilized as multipurpose crop since ancient time, being a measure for smallholder farmers to mitigate prolonged droughts and thus climate change effects. However, there is little research on enset agriculture to provide appropriate advice to farmers. Enset management relies on farmers’ indi...

Maize is staple food and the most cultivated crop in Eswatini. However, its yield is very low partly due to use of non-optimum plant density for different maturity group maize varieties. Thus, an experiment was conducted at Luyengo, Middleveld of Eswatini during the 2018/2019 cropping season. The experiment consisted of factorial combinations of tw...

Faba bean (Vicia faba L.) has a significant potential for nutrient source, income generation and soil fertility management in smallholder farming systems of northern highlands of Ethiopia. However, its cultivation is strongly hampered by the occurrence of the obligate root holo-parasite, crenate broomrape (Orobanche crenata Forskal). To gather base...

Smallholders throughout sub-Saharan Africa produce legume crops as sources of food, fodder, and cash income, as well as to improve soil fertility. Ethiopian farmers have developed diverse legume varieties that enable adaptation to changing agroecological and sociocultural conditions. However, over the past several decades, as farm sizes declined an...

A field experiment was conducted in 2012 cropping season to determine the optimum rates of nitrogen and phosphorus fertilizers for maximum yield of common bean and to select the best combination of varieties and fertilizer levels for optimum yield on nitisols at Mechara research station. The treatment consists of four common bean varieties (Awash M...

Ensete ventricosum (enset) has been cultivated in Ethiopia since ancient times. It is a multipurpose, drought tolerant and food security crop. When burying enset corms for vegetative propagation, manure is usually placed on the soil surface. However, there is no research-based evidence to justify this practice. We hypothesised that enset sucker pro...

Sorghum (Sorghum bicolor L. Moench) is one of the leading drought-tolerant crops often used to mitigate droughts for meeting household food security in Ethiopia. However, poor stand establishment is one of the major factors that constrain productivity of the crop. Poor stand establishment of sorghum is affected be certain conditions after sowing, w...

Maize (Zea mays) is a major staple crop in NorthWestern Ethiopia. Narrow leaf lupine (Lupinus angustifolius) grain is a commercial concentrates for livestock feed. Maize-lupine intercropping is a sustainable and emerging crop production approach for the resource poor smallholder farmers of NorthWestern Ethiopia; however, there is no recommended fer...

The mixed crop–livestock systems are acknowledged as sustainable due to its complementarity and synergy, contribution to welfare, food security, income, and poverty alleviation. The lack of efforts in the long-term impact for increased and more efficient food production, however, threatens the livelihoods and food security of smallholder producers....

This book has been a collective effort by 26 members of the International Parthenium Weed Network, which is an International network of expert volunteers devoted to creating awareness about the parthenium weed ( Parthenium hysterophorus ) threat, and to sharing information on how to reduce its adverse impacts upon agro-ecosystems, the environment a...

Background Bread wheat is an important staple and cash crop grown by smallholder farmers in the central highlands of Ethiopia. However, the productivity of the crop is constrained by low soil fertility and poor nitrogen fertilizer management in the area. For example, there is limited information on optimum rates and timing of nitrogen fertilizer ap...

Article Info Cabbage (Brassica oleracea L.) is the second most important vegetable crop in Ethiopia in area coverage as well as level of production next to red pepper. However, yield of the crop is often constrained by low and imbalanced nutrient supply. This study was conducted at the Bore Agricultural Research Center (BoARC) during the period fro...

Abstract Background Nitrogen is one of the most important nutrients limiting yield of bread wheat in Ethiopian highlands. Application of a large amount of N fertilizer has been a method of increasing yield in the study area which is costly and can cause environmental pollution. Therefore, a field experiment was conducted for two consecutive years (...