Introduction
The zones of Ari, Konso, South Omo, and Basketo in Southern Ethiopia represent a diverse agricultural landscape characterized by contrasting agroecological conditions, ranging from the semiarid lowlands of Konso to the relatively moisturereliable midaltitude areas of Ari and Basketo [1-3]. In these areas, agriculture is predominantly rainfed and small-holder-based, forming the backbone of rural livelihoods. Despite its importance, agricultural production in these zones continues to face persistent challenges, including climate variability, declining soil fertility, limited access to improved technologies, and increasing biotic pressures [4-6].
Among these constraints, biotic stresses such as crop diseases, insect pests, and parasitic weeds play a major role in reducing agricultural productivity and threatening food security. A comprehensive review by [7]. highlights that these biotic constraints are among the most critical limiting factors in Southern Ethiopia, particularly in Ari, South Omo, and Konso zones, where farmers frequently experience yield losses due to disease outbreaks, pest infestations, and aggressive weed species such as Striga. Similar concerns have also been widely reported in earlier agronomic studies across the region [8-10].
These challenges are further intensified by weak pest management systems and limited access to effective control technologies at the farm level.
In Konso zone, farmers have developed remarkable indigenous soil and water conservation practices, particularly stone terrace systems that have gained international recog-nition for their sustainability [4,11]. However, despite these efforts, agricultural production remains highly vulnerable to recurrent drought and severe biotic pressures, including Striga infestation, which can lead to complete crop failure in sorghumbased systems (Tesso & Ejeta, 2011; Ejeta, 2007). Post-harvest losses are also significant, with traditional storage systems often failing to protect grains from insect damage [6].
South Omo zone is dominated by agropastoral systems where crop production is closely integrated with livestock keeping. Although this system provides livelihood resilience, it is frequently affected by recurrent drought, rangeland degradation, and limited agricultural infrastructure [12-13]. Research efforts in this zone have mainly focused on technology demonstrations and the introduction of improved crop and forage varieties [14-15] However, detailed agronomic information such as soil fertility status, fertilizer response, and crop productivity under local conditions remains limited [16, 5].
The Ari zone represents a more diverse agroecological setting, where enset, maize, and sorghum are the dominant crops [1,7]. Although some studies have explored crop diversification and production constraints, systematic agronomic experimentation is still limited. Biotic stresses, including maize leaf blight and Fusariumrelated diseases, have been reported as major yield-reducing factors in the zone [7]. These challenges further emphasize the need for location specific agronomic research to improve productivity and resilience.
Compared to the other zones, Basketo remains significantly under researched. Existing literature is very limited and mainly focuses on woody species diversity and a few recent studies on fertilizer response in selected crops [3,17]. There is a clear absence of systematic agronomic data, including cropping systems, soil fertility status, and pest management practices. This lack of evidence makes it difficult to design appropriate agricultural development interventions for the zone.
In general, the agricultural systems of these four zones are under increasing pressure from both abiotic and biotic factors. As emphasized by [7], biotic constraints such as pests, diseases, and weeds remain major bottlenecks to sustainable crop production and food security in Southern Ethiopia. At the same time, broader policy and development strategies in Ethiopia stress the importance of generating location-specific and evidence based agricultural recommendations rather than generalized approaches [18, 16]. Climate change, particularly in semiarid areas like Konso and South Omo, further increases vulnerability and necessitates adaptive agronomic solutions [19, 13]. Therefore, this review aims to: synthesize existing agronomic research conducted in Ari, Konso, South Omo, and Basketo zones;
identify major findings related to crop production, soil fertility, pest and disease management, and technology adoption; highlight key research gaps and limitations; suggest future research priorities to support sustainable agricultural development in these understudied regions
Methodology
This study used a narrative review approach to bring together and summarize agronomic research activities carried out in Ari, Konso, South Omo, and Basketo zones of Southern Ethiopia. The purpose was to understand what has been studied so far, identify key findings, and highlight existing gaps in research.
Relevant literature was gathered from different sources, including journal articles, MSc theses, institutional reports, and online databases such as Google Scholar and university repositories. The search focused on key terms such as agronomic research, crop production, soil fertility, pest and disease management, farming systems, and the names of the study zones.
After collecting the literature, studies were carefully screened based on their relevance to crop production systems, soil management, pest and disease constraints, climate adaptation, and technology use. Repeated and unrelated studies were removed. The remaining studies were then organized into main themes and summarized in a clear and descriptive way.
Results
Agronomic Research
The review indicates that agronomic research in Ari, Konso, South Omo, and Basketo zones has mainly focused on improving crop production, enhancing soil fertility, managing pests and diseases, and introducing improved agricultural technologies (Table 1). These research efforts are generally aimed at increasing agricultural productivity and supporting the dominant smallholder farming systems in the study areas.
However, the extent and intensity of agronomic research are not uniform across the four zones. Ari and South Omo zones have received relatively greater research attention, particularly in crop production practices and technology demonstration activities. In contrast, Konso and especially Basketo zones are less studied, with limited experimental research and weak documentation of agronomic practices.
This imbalance in research coverage has resulted in a lack of consistent, location-specific agronomic information across the zones. While some studies provide useful findings on crop performance and soil management, many of the results remain general and are not fully tailored to the diverse agroecological conditions of each area. Consequently, many farmers still rely largely on traditional practices and have limited access to improved and well adapted technologies. Overall, the findings show that although agronomic research has contributed to improving understanding of farming systems in Southern Ethiopia, significant disparities remain among the zones. This highlights the need for more balanced, context-specific, and participatory research to support sustainable and equitable agricultural development
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Zone
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Main Research Focus
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Major Crops
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Key Challenges
|
|
Ari
|
Crop production, disease control
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Maize, sorghum, Enset
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Leaf blight, Fusarium diseases
|
|
Konso
|
Soil conservation, Striga management
|
Sorghum, maize
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Drought, Striga infestation
|
|
South Omo
|
Technology promotion, mixed farming
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Maize, sorghum, forage crops
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Drought, soil fertility decline
|
|
Basketo
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Very limited research, fertilizer use
|
Potato, minor crops
|
Lack of data and studies
|
Table 1: Main Agronomic Research Focus in the Study Zones
Crop Production Situation
Across all four zones, the review shows that the use of improved crop varieties combined with better agronomic practices has a strong potential to increase crop yields. In Ari and South Omo zones, for example, studies reported noticeable improvements in maize and sorghum productivity when farmers used improved seeds together with appropriate soil fertility management practices [7, 5].
In Konso zone, traditional farming systems particularly the well known stone terrace structures continue to play a vital role in sustaining crop production under harsh environmental conditions [4]. Despite this resilience, overall agricultural productivity remains low due to erratic rainfall patterns, declining soil fertility, and limited access to improved agricultural inputs and technologies [19].
Soil Fertility Challenges
Soil fertility decline is one of the most serious and wide spread constraints affecting crop production in all four zones. Farmers often apply limited amounts of fertilizer, and in many cases, the existing fertilizer recommendations do not match local soil conditions.
[16] emphasized that fertilizer recommendations in Ethiopia are generally broad and fail to capture important site specific differences. This challenge is particularly evident in South Omo and Basketo zones, where soil fertility data and detailed soil characterization studies are very limited. As a result, many farmers continue to experience low yields even when improved crop varieties are used.
Pests, Diseases, and Weeds
The review clearly indicates that pests, diseases, and weeds are major biotic constraints affecting agricultural production in the study areas. According to [7], these challenges significantly contribute to low crop productivity in Ari, Konso, and South Omo zones.
One of the most severe problems is Striga (witchweed), which heavily affects sorghum and maize production, particularly in Konso and South Omo zones [8-9]. In Ari zone, farmers frequently face crop diseases such as maize leaf blight and Fusarium infections, both of which have substantial negative impacts on yield levels [7].
Technology Use and Farming Systems The adoption of improved agricultural technologies remains generally low across most of the study zones. This situation is mainly attributed to weak extension services, limited financial capacity of farmers, and low awareness of improved farming practices.
Among the four zones, South Omo has relatively better exposure to demonstration based technology dissemination activities. In contrast, Basketo zone remains largely underresearched and has received very limited attention from formal agricultural research and extension systems [15, 3]. Despite these limitations, indigenous knowledge systems continue to play an important role, particularly in Konso zone, where farmers have long practiced effective soil and water conservation techniques. These traditional practices demonstrate that local knowledge is valuable and can complement modern agronomic innovations when properly integrated [4].
Key Research Gaps
Table 2 highlights several critical gaps in agronomic research across Ari, Konso, South Omo, and Basketo zones. These include a persistent lack of location specific agronomic recommendations tailored to the diverse agroecological conditions of the areas. In addition, field based experimental studies are very limited, particularly in the Basketo zone, where research evidence is almost nonexistent. Another major gap is the weak integration of farmers’ indigenous knowledge with formal scientific research, which limits the relevance and applicability of findings at the local level. Furthermore, there is insufficient attention given to climateresilient farming systems, despite increasing climate variability in the region. Overall, agronomic research efforts remain unevenly distributed, with some zones receiving considerably more attention than others, leading to imbalanced knowledge generation across the study areas
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Area
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Main Gap
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Effect
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Soil fertility
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No site-specific data
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Low fertilizer efficiency
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Crop production
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Few field experiments
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Slow productivity improvement
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|
Pest management
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Weak control strategies
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High crop losses
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Basketo zone
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Almost no research
|
Poor agricultural planning
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|
Climate adaptation
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Limited studies
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High vulnerability
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Table 2: Major Research Gaps Identified
Discussion
Overall, this review shows that agronomic research in Ari, Konso, South Omo, and Basketo is still developing and un-evenly distributed. While some progress has been made in crop production and soil management, many challenges remain unsolved.
One of the most important findings is the strong impact of pests, diseases, and weeds on crop production. As highlighted by [7], these biotic stresses are a major barrier to achieving food security in Southern Ethiopia. Similar concerns have been reported by earlier studies, especially regarding Striga infestation in cereal crops [8, 9].
Soil fertility decline is another major issue limiting productivity. The findings agree with [16], who emphasized that fertilizer use must be better adapted to local conditions. Without this, farmers will continue to experience low yields even when improved technologies are introduced.
The review also shows that local farming knowledge, especially in Konso, remains very important. This suggests that future agricultural development should not ignore traditional practices but rather combine them with modern scientific approaches.
In general, the study highlights the need for stronger, more practical, and location specific research. Improving collaboration between researchers, extension workers, and farmers will be key to making agricultural technologies more effective and widely used.
Recommendations
Based on the findings of this review, several key recommendations are proposed to improve agronomic research and agricultural development in Ari, Konso, South Omo, and Basketo zones of Southern Ethiopia.
First, future agronomic research should prioritize the development of location specific recommendations that reflect the unique agroecological conditions of each zone. This is essential to improve the effectiveness and adoption of agricultural technologies by farmers.
Second, there is a strong need to strengthen fieldbased experimental research, particularly in understudied areas such as Basketo zone. Generating primary agronomic data in these areas will help fill existing knowledge gaps and support evidencebased decisionmaking.
Third, researchers and development actors should work to integrate farmers’ indigenous knowledge with modern scientific approaches. Local farming experience, especially in soil and water conservation, can play a valuable role in improving the relevance and sustainability of agronomic innovations. Fourth, greater emphasis should be placed on climate resilient agriculture, including drought tolerant crop varieties, moisture conservation techniques, and sustainable soil management practices to address increasing climate variability in the region.
Finally, stronger collaboration between research institutions, extension services, and local farmers is necessary to improve technology dissemination, enhance adoption rates, and ensure that research outputs translate into practical benefits for farming communities
Acknowledgement
The author would like to sincerely acknowledge all researchers and institutions whose works were reviewed and contributed to this study. Special appreciation is extended to scholars whose agronomic research in Ari, Konso, South Omo, and Basketo zones provided valuable insights for this review.
