Multi-influencing-factors’ evaluation for organic-based soil fertility technologies out-scaling in Upper Tana Catchment in Kenya

Nganga, Beatrice; Nge’tich, K. O.; Macharia, Martin; Kiboi, N. Milka; Adamtey, Noah; Ngetich, Felix K.

doi:10.1016/j.sciaf.2019.e00231

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…However, the addition of organic resources may contribute to increased soil N 2 O emissions [66]. Some of the organic inputs used in SSA include animal manure, Tithonia diversifolia, numerous leguminous plants, crop residues, and some herb trees such as Lantana Camara [25,67,68]. A couple of studies have quantified organic resources' effects on N 2 O emissions in SSA across cropping systems.…”

Section: N 2 O Emissions From Organic and Inorganicmentioning

confidence: 99%

“…For instance, soil type-soil fertility management targeting is an appropriate mechanism in evaluating N 2 O emissions mitigation. Organic manure, which is readily available in most SSA households (e.g., Macharia et al[67] and Nganga et al[68]) may provide an essential entry point in mitigating N 2 O emissions in SSA. Manure enriches soils with mineralizable C and N, thus improving soil fertility, general soil health, and crop yields but may come at the cost of more N 2 O emissions…”

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confidence: 99%

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Nitrous Oxide Emissions from Smallholders’ Cropping Systems in Sub-Saharan Africa

Lemarpe

Musafiri

Macharia

et al. 2021

Advances in Agriculture

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Increased concentration of atmospheric nitrous oxide (N2O), a potent greenhouse gas (GHG), is of great concern due to its impact on ozone layer depletion leading to climate change. Ozone layer depletion allows penetration of ultraviolet radiations, which are hazardous to human health. Climate change culminates in reduced food productivity. Limited empirical studies have been conducted in Sub-Saharan Africa (SSA) to quantify and understand the dynamics of soil N2O fluxes from smallholder cropping systems. The available literature on soil N2O fluxes in SSA is limited; hence, there is a pressing need to consolidate it to ease mitigation targeting and policy formulation initiatives. We reviewed the state of N2O emissions from selected cropping systems, drivers that significantly influence N2O emissions, and probable soil N2O emissions mitigation options from 30 studies in SSA cropping systems have been elucidated here. The review outcome indicates that coffee, tea, maize, and vegetables emit N2O ranging from 1 to 1.9, 0.4 to 3.9, 0.1 to 4.26, and 48 to 113.4 kg N2O-N ha-1 yr−1, respectively. The yield-scaled and N2O emissions factors ranged between 0.08 and 67 g N2O-N kg−1 and 0.01 and 4.1%, respectively, across cropping systems. Soil characteristics, farm management practices, and climatic and environmental conditions were significant drivers influencing N2O emissions across SSA cropping systems. We found that site-specific soil N2O emissions mitigation measures are required due to high variations in N2O drivers across SSA. We conclude that appropriate fertilizer and organic input management combined with improved soil management practices are potential approaches in N2O emissions mitigation in SSA. We recommend that (i) while formulating soil N2O emissions mitigation approaches, in SSA, policymakers should consider site-specific targeting approaches, and (ii) more empirical studies need to be conducted in diverse agroecological zones of SSA to qualify various mitigation options on N2O emissions, yield-scaled N2O emissions, and N2O emission factors which are essential in improving national and regional GHG inventories.

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Section: N 2 O Emissions From Organic and Inorganicmentioning

confidence: 99%

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confidence: 99%

Nitrous Oxide Emissions from Smallholders’ Cropping Systems in Sub-Saharan Africa

Lemarpe

Musafiri

Macharia

et al. 2021

Advances in Agriculture

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“…The multi-influencing factor (MIF) technique fully incorporates the interaction between variables when determining parameter weights (Taheri et al, 2020). The applicability of this method for assessing agricultural suitability has been successfully examined and published by Nganga et al (2020); Mandal et al (2021); Roy et al (2023). Hence, in this study, we employed the MIF technique to establish weights for various influencing variables or thematic layers, while employing fuzzy set theory to fuzzify the indicators.…”

Section: Introductionmentioning

confidence: 99%

Integrating multi-influencing factor techniques and fuzzy methods to identify recommendation domains for out-scaling conservation agriculture in China

Zhao

Dai

Liu

et al. 2023

Front. Sustain. Food Syst.

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Climate-smart agriculture (CSA) is a global development strategy aimed to address the interlinked challenges of food security and climate change. Expanding the implementation of conservation agriculture (CA), a vital component of CSA, is essential for enhancing agricultural and food security resilience while sustainably managing arable land. However, the extensive heterogeneity of biophysical and socioeconomic conditions presents significant complexities in promoting CA adoption. Addressing these challenges, this study carried out a comprehensive theoretical investigation of biophysical and socioeconomic factors influencing CA adoption and performance, integrating stakeholder feedback to create a systematic and robust evaluation index system for assessing CA suitability. By integrating multi-influencing factor techniques and fuzzy logic methods, we spatially identified suitable areas for CA implementation in China, providing valuable insights for land use policy. The reliability of the models was verified through a sensitivity analysis using the map removal sensitivity analysis method and the extended Fourier amplitude sensitivity test. The results indicated that 29.78% of the cultivated land was unsuitable or marginally suitable for CA, while 29.30 and 40.92% were determined to be moderately suitable and suitable zones, respectively. Suitable cultivated land was primarily distributed in the northern arid and semi-arid regions, the Loess Plateau, the Huang-Huai-Hai Plain, and the Northeast China Plain. Conversely, unsuitable, and marginally suitable cultivated land was predominantly located in the Qinghai Tibet Plateau, Middle-lower Yangtze Plain, Sichuan Basin and surrounding areas, the Yunnan-Guizhou Plateau, and Southern China. The topographical index, annual mean precipitation, humidity index, and population density were identified as the most significant factors influencing CA suitability. The CA suitability maps generated in this study will guide the development and extension agents targeting CA to suitable locations with a high potential impact, thereby maximizing the likelihood of adoption and minimizing the risk of failure.

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“…Smallholder farmers produce and manage organic resources such as crop residues (Valbuena et al, 2012;Turmel et al, 2015), animal manure (Rufino et al, 2007) and farmyard manure/compost on farm. They may also collect off-farm organic resources, such as forest litter or plant residues from field margins, to apply in their soils as a key source of nutrients for their crops (Nekesa et al, 2007;Nganga et al, 2020). Different types of organic inputs play distinct roles in the improvement of soil health by increasing SOM and in providing nutrients to support crop productivity (Rusinamhodzi et al, 2016;Wood et al, 2018;Vanlauwe et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Organic Nutrient Source Allocation and Use in Smallholder Farming Communities: What Are We Missing?

Nyamasoka-Magonziwa

Vanek

Carolan

et al. 2021

Front. Sustain. Food Syst.

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Organic nutrient sources (ONS) are managed as a key resource by smallholder farmers to maintain the productivity of soils. Recycling of ONS by applying them to soils is a globally dominant strategy of ecological nutrient management. Understanding how ONS produced on-farm are allocated and what drives farmer decision making around their use is critical for sustainable nutrient management in smallholder agroecosystems. Using focus group discussions and a survey of 184 farming households, we studied socio-economic, socio-cultural, and environmental drivers of ONS allocation and use at the farm scale in three contrasting agroecological zones of western Kenya. Farm typologies of ONS management were also developed using cluster analysis based on resource endowment and the connectedness of farmers, management norms, and interaction with extension. Our findings suggest that the more resource endowed a farmer is, the more ONS are allocated to the main plot within the farm. We also observed that farmers preferred allocating more resources to plots that were considered more fertile. Land tenure had an important influence, in that main plots not owned by farmers were more likely to retain ONS such as crop residues. Management of residues is dependent on farmer gender, for instance, female farmers tended to burn legume residues in particular, which is notable since these higher quality residues are often considered key to sustainable soil nutrient management. Farm typologies featured different allocation patterns of ONS and were associated with resource endowment and farmer networks, including external ties to extension agents and internal ties to other farmers. Finally, there was a strong overarching influence of agroecological zone that often escapes characterization on the allocation of ONS. As research and development organizations continue to engage with smallholder farmers to reduce the burden of global food insecurity, the insights gained by this research will allow better anticipation of drivers and obstacles to improved nutrient management in these farming landscapes and communities.

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Multi-influencing-factors’ evaluation for organic-based soil fertility technologies out-scaling in Upper Tana Catchment in Kenya

Cited by 8 publications

References 32 publications

Nitrous Oxide Emissions from Smallholders’ Cropping Systems in Sub-Saharan Africa

Nitrous Oxide Emissions from Smallholders’ Cropping Systems in Sub-Saharan Africa

Integrating multi-influencing factor techniques and fuzzy methods to identify recommendation domains for out-scaling conservation agriculture in China

Organic Nutrient Source Allocation and Use in Smallholder Farming Communities: What Are We Missing?

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