Agro-nanotechnology—the application of nanotechnology in agriculture—holds immense promise for addressing main challengesin African agriculture and promoting sustainable development. This review provides a comprehensive analysis of how agro-nanotechnology is being utilized across Africa, emphasizing its potential to revolutionize various aspects of agricultural practiceson the continent. Firstly, the utilization of nanomaterials such as nanoparticles, nanofertilizers, and nanopesticides offersopportunities for enhancing nutrient management, improving soil health, and increasing crop productivity in diverseagroecosystems across Africa. Nanofertilizers, with their controlled release mechanisms, facilitate efficient nutrient uptake byplants, thereby reducing nutrient losses and enhancing fertilizer use efficiency, which is crucial for resource-constrainedsmallholder farmers. Nanopesticides suggest improved efficacy in pest and disease control, reducing environmental harmcompared to traditional pesticides. Their targeted delivery also minimizes off-target effects, which is crucial for Africa’s foodsecurity. Nanosensors also enable real-time monitoring of soil and crop health, enhancing precision agriculture. Nanotechnologyin postharvest management reduces food losses and improves safety. However, its adoption requires careful consideration ofsocioeconomic and regulatory factors to ensure equitable access and environmental safety. Collaborative efforts involvingpolicymakers, researchers, farmers, and other stakeholders are crucial for harnessing the benefits of agro-nanotechnology whileaddressing potential risks and concerns. In conclusion, the integration of agro-nanotechnology into African agriculture presents atransformative opportunity to enhance productivity, resilience, and sustainability, contributing to the continent’s efforts towardachieving food security, economic development, and environmental conservation.Keywords: agro-nanotechnology; nanofertilizers; nanopesticides; nanosensors; precision agriculture

Intercropping is an essential farming system that combines multiple crop speciessimultaneously. in ethiopia, pepper and Black cumin are interplanted with various crops,influenced by diverse environmental and agronomic factors. this review examines the impactof intercropping pepper and Black cumin on the performance of component crops andsystem productivity in ethiopia. Farmers in tropical regions practice intercropping widely toreduce dependence on monoculture, manage risks from pests, diseases, and climate variability,and enhance resilience. By integrating pepper and Black cumin with other crops, small‑scalefarmers in developing countries like ethiopia diversify crop production and improve yields.Most smallholder farmers in ethiopia cultivate plots smaller than one hectare. the landequivalent ratio is a key measure for evaluating intercropping efficiency. However, indicessuch as relative Yield total, Staple land equivalency ratio, Area time equivalency ratio, andArea Harvest equivalency ratio are also applied globally. these indices help assess the benefitsof intercropping in terms of land use and time management. to maximize productivity,farmers must carefully select crops that balance resource competition, resist pests anddiseases, and ensure yields with superior quality. promoting sustainable intercropping practicescan boost agricultural output and contribute to food security in ethiopia and similar regions.
KEYWORDS: indices; multiple cropping; sole cropping; spatial arrangement

Abstract: Peanut production plays a crucial role in global food security, particularly in developingcountries, where it provides essential nutrition and income. This paper examines the optimizationof peanut production through genetic advancements, climate adaptation strategies, and sustainablepractices. The primary objective is to increase yields by addressing challenges related to climatechange, pests, and resource constraints. Globally, peanut production is hindered by rising temper-atures, irregular rainfall, and declining soil quality, impacting both yield and quality. Developingcountries, especially in Africa and Asia, face additional challenges, such as limited access to advancedagricultural technologies, inadequate infrastructure, and insufficient support for smallholder farmers.The vital issues include genetic vulnerabilities to pests, climate stress, and inefficient water use.Recent genetic research has provided insights into breeding more resilient, drought-resistant varieties,offering hope for improving yields, despite environmental challenges. The adoption of climateadaptation strategies, precision farming, and integrated pest management is essential for boostingproductivity. These, along with optimized irrigation and nutrient management, have significantlyimpacted peanut production in resource-limited settings. Additionally, drought-resistant varietieshave proven crucial, enabling farmers to increase resilience and yields in areas facing climate stress.In conclusion, optimizing peanut production requires continued investment in genetic advancements,infrastructure, and sustainable practices. Future efforts should focus on improving climate adaptationand sustainable farming techniques for long-term success.Keywords: climate adaptation; drought-resistant varieties; genetic advancements; integrated pestmanagement; precision farming; sustainable practices

Precision agriculture technologies (PATs) transform crop production by enabling more sustainable and efcient agriculturalpractices. Tese technologies utilize data-driven approaches to optimize the management of crops, soil, and resources, thusenhancing both productivity and environmental sustainability. Tis article reviewed the application of PATs for sustainable cropproduction and environmental sustainability around the globe. Key components of PAT include remote sensing, GPS-guidedequipment, variable rate technology (VRT), and Internet of Tings (IoT) devices. Remote sensing and drones deliver high-resolution imagery and data, enabling precise monitoring of crop health, soil conditions, and pest activity. GPS-guided machineryensures accurate planting, fertilizing, and harvesting, which reduces waste and enhances efciency. VRToptimizes resource use byallowing farmers to apply inputs such as water, fertilizers, and pesticides at varying rates across a feld based on real-time data andspecifc crop requirements. Tis reduces over-application and minimizes environmental impact, such as nutrient runof andgreenhouse gas emissions. IoT devices and sensors provide continuous monitoring of environmental conditions and crop status,enabling timely and informed decision-making. Te application of PAT contributes signifcantly to environmental sustainabilityby promoting practices that conserve water, reduce chemical usage, and enhance soil health. By enhancing the precision ofagricultural operations, these technologies reduce the environmental impact of farming, while simultaneously boosting cropyields and proftability. As the global demand for food increases, precision agriculture ofers a promising pathway to achievingsustainable crop production and ensuring long-term environmental health.Keywords: environmental sustainability; precision agriculture technologies; precision farming; sustainable crop production

Heavy metals pose a significant threat to public health and economic stability in Ethiopia,contaminating various environmental media, including water, soil, and air. This paper aimed toprovide an overview of the public health and economic burden of heavy metals in Ethiopia.Exposure to heavy metals such as lead, mercury, cadmium, and arsenic has been linked tonumerous adverse health effects, including neurological disorders, renal failure, cardiovasculardiseases, and cancer. In Ethiopia, populations are particularly vulnerable to heavy metal exposuredue to various factors, such as artisanal mining, industrial activities, agricultural practices, andinadequate waste management systems. The economic burden of heavy metal contaminationmanifests through increased healthcare costs, loss of productivity, and environmental remedia-tion expenses. Furthermore, the impact extends to sectors such as agriculture and tourism,affecting national development goals and exacerbating poverty levels. Efforts to mitigate thepublic health and economic burdens of heavy metals in Ethiopia require multidisciplinary ap-proaches, including policy interventions, regulatory enforcement, public awareness campaigns,and investment in sustainable development practices. Strengthening monitoring systems,implementing pollution control measures, and promoting research on alternative technologies forwaste management are essential steps toward addressing this pressing issue. In conclusion,addressing the public health and economic challenges posed by heavy metal contamination inEthiopia necessitates concerted efforts from the government, industry, academia, and civil societyto safeguard human health, preserve the environment, and promote sustainable development.
Keywords: Economic burden, Heavy metals, Lead, Public health, Strategies

Abstract
Carrot is a significant root crop in Ethiopia but its production faces challenges such as nutrient loss and unfavorable growth conditions, which hinder its productivity. The objective of this review was to evaluate the impact of nitrogen fertilizer rates on carrot yield in Ethiopia. A systematic review using databases like PubMed and Scopus focused on peer-reviewed, English-language studies with quantitative data on nitrogen fertilizer and carrot yield in Ethiopia, excluding non-peer-reviewed articles and those lacking quantitative data or in other languages. Globally, carrot yields are 30–100 tons per hectare, but only 5.5 tons in Ethiopia. Carrots are rich in vitamins A, C, and B, proteins, minerals, and fiber, with vitamin C boosting immunity and aiding in wound healing and allergy management. Meanwhile, vitamin A plays a crucial role in vision, bone growth, immune function, and reproduction. It is a rich source of carotenoids and anthocyanins. The application of nitrogen fertilizer significantly improved carrot yield (root length, fresh weight, and dry weight). In Ethiopia, the use of nitrogen fertilizer affects the marketability and total yield of carrots, with small-scale farmers employing diverse rates for cultivation. Current recommendations suggest 69 kg/ha of phosphorus (P2O5) and 46 kg/ha of nitrogen, but farmers often do not follow these guidelines. In conclusion, optimizing nitrogen fertilizer usage is crucial for enhancing carrot yields among small farmers, underscoring the need for government support to tailor recommendations to local soil conditions and boost productivity.

Keywords: carrot yield; carrot production; nitrogen fertilizer; nutrient management

Sweet potato (Ipomoea batatas L.) holds significant promise in addressing economic challenges and malnutrition issues. However, various factorsin Ethiopia impede its production and consumption. This review investigates sweet potato potential as a versatile solution for nutritionalchallenges in Ethiopia. Although the global yield of sweet potato reaches 14 tons/ha, in Ethiopia, it stands at approximately 8.1 tons/ha. In Africa,sweet potato is known as the 'poor person’s crop' and is primarily grown on a small scale by women for subsistence. Sweet potatoes are rich inessential nutrients such as vitamins C and E, B vitamins, iron, zinc, potassium, and fiber. Additionally, in Ethiopia, sweet potato leaves are utilizedas food, animal feed, and traditional medicine. Notably, they contain high levels of lutein (ranging from 38-51 mg/100 g), surpassing those foundin kale (38 mg/100 g) and spinach (12 mg/100 g). Leaves encompass protein (25%−37%), carbohydrate (42%−61%), crude fat (2%−5%), fiber(23%−38%), ascorbic acid (60−200 mg/100 g), and carotene (60−120 mg/100g). Malnutrition is continued as a major hurdle for millions ofEthiopians. Currently, stunting, wasting, and vitamin A deficiency (VAD) stand as the primary factors contributing to premature mortality inEthiopia. Despite the country's considerable potential for sweet potato cultivation and utilization, both yields and consumption remainremarkably low. Lack of clean planting materials, pests and diseases, knowledge gap, and poor market system are the key challenges of sweetpotato production in Ethiopia. Hence, to ease the malnutrition problems in Ethiopia, sweet potato production and utilization should be adept in abroader range.

Abstract: Forests play a crucial role in mitigating theimpacts of climate change by sequestering carbon in theirbiomass and soil. However, Ethiopia faces the threat of soilcarbon emissions due to deforestation and continuous cul-tivation. This study reviewed the analogies in phytobio-mass and soil carbon evaluation methods in Ethiopia.Index-base and year-wise analysis methods were used forthe compilation of the study. Developing nations, such asEthiopia, duly enhance resilient measures to assess forestcarbon stocks for effective climate change mitigation, parti-cularly with reference to emissions from deforestation anddegradation. Even though more than 90% of Ethiopia’senergy comes from forest biomass, deforestation signifi-cantly affects the carbon stored in aboveground biomass,which is the largest reservoir. Estimating forest biomassand carbon emissions entails uncertainties, with errorranges around ±50% for aboveground pools and ±90% forsoil carbon pools. Various tier methodologies are employedby experts to estimate forest biomass and carbon stock emis-sions, with Tier 2 factors serving as default emissions butcountry-specific factors offering improved accuracy overTier 1. Tier 3 methodologies require highly specific inven-tory data on carbon stocks in different pools and commonmeasurements of key carbon stocks. Forest conservationenhances biodiversity, ecosystem resilience, and essentialecosystem services, fostering soil health, regulating watercycles, and supporting diverse plant and animal species.In conclusion, directing efforts towards forest conservationnot only helps maintain biodiversity and ecosystem servicesbut also significantly contributes to mitigating climate change
by enhancing carbon storage capacities and reducing green-house gas emissions.Keywords: allometric equations, carbon stock, carbon accounting, climate change, tie

Cabbage (Brassica oleracea var. capitata L.) holds signifcant agricultural and nutritional importance in Ethiopia; yet, its pro-duction faces challenges, including suboptimal nitrogen fertilizer management. Te aim of this review was to review the possibleefect of nitrogen fertilizer levels on the production of cabbage in Ethiopia. Nitrogen fertilization signifcantly infuences cabbageyield and quality. Moderate to high levels of nitrogen application enhance plant growth, leaf area, head weight, and yield.However, excessive nitrogen levels can lead to adverse efects such as delayed maturity, increased susceptibility to pests anddiseases, and reduced postharvest quality. In Ethiopia, small-scale farmers use diferent nitrogen levels for cabbage cultivation. InEthiopia, NPSB or NPSBZN fertilizers are widely employed for the growing of various crops such as cabbage. 242 kg of NPS and79 kg of urea are the blanket recommendation for the current production of cabbage in Ethiopia. Te existing rate is not conducivefor farmers. Terefore, small-scale farmers ought to utilize an optimal and cost-efective nitrogen rate to boost the cabbage yield.Furthermore, the efectiveness of nitrogen fertilization is infuenced by various factors including the soil type, climate, cabbagevariety, and agronomic practices. Integrated nutrient management approaches, combining nitrogen fertilizers with organicamendments or other nutrients, have shown promise in optimizing cabbage production while minimizing environmentalimpacts. Te government ought to heed suggestions concerning soil characteristics such as the soil type, fertility, and additionalfactors such as the soil pH level and soil moisture contents.

Onion (Allium cepa L.) is the most important commercial vegetable crop widely grown throughout the world. It is also animportant bulb crop in Ethiopia. However, its production and productivity are restricted by diferent factors, including biotic andabiotic stresses. Tis review investigates the potential impacts of spacing and varieties on onion yield and yield components inEthiopia. Countries around the world are producing onion for its nutritional value, medicinal properties, minerals, proteins, andcarbohydrates. In terms of production, onion ranks second only after tomatoes. Te average onion yield in Ethiopia is estimated tobe 8.8 tons/ha, while in the world, it is approximately 19.7 tons/ha. Inappropriate spacing and inadequate onion varieties are someof the limitations widely described for yield variation in Ethiopia. Tus, to control the size, shape, and yield of onion bulbs, spacingdetermination and variety improvement are some of the techniques currently employed in Ethiopia. Adama red, Bombay red, andred creole are some of the known varieties in the country, and the intrarow spacings for Adama red and Bombay red are reported tobe 4 cm and 6 cm, respectively. Diferent spacing between onion plants afects how much they produce and other factors such assize and quality, depending on the variety. It is important to assess whether changing spacing makes sense from both a farmingand economic standpoint, alongside considering other agricultural methods.