Combining organic and mineral fertilizers as a climate-smart integrated soil fertility management practice in sub-Saharan Africa: a meta-analysis

Low productivity and climate change require climate-smart agriculture (CSA) for sub- Saharan Africa (SSA), through (i) sustainably increasing crop productivity, (ii) enhancing the resilience of agricultural systems, and (iii) offsetting greenhouse gas emissions. We conducted a meta-analysis on experimental data to evaluate the contributions of combining organic and mineral nitrogen (N) applications to the three pillars of CSA for maize (Zea mays). Linear mixed effect modeling was carried out for; (i) grain productivity and agronomic efficiency of N (AE) inputs, (ii) inter-seasonal yield variability, and (iii) changes in soil organic carbon (SOC) content, while accounting for the quality of organic amendments and total N rates. Results showed that combined application of mineral and organic fertilizers leads to greater responses in productivity and AE as compared to sole applications when more than 100 kg N ha-1 is used with high-quality organic matter. For yield variability and SOC, no significant interactions were found when combining mineral and organic fertilizers. The variability of maize yields in soils amended with high-quality organic matter, except manure, was equal or smaller than for sole mineral fertilizer. Increases of SOC were only significant for organic inputs, and more pronounced for high-quality resources. For example, at a total N rate of 150 kg N ha-1 season-1, combining mineral fertilizer with the highest quality organic resources (50:50) increased AE by 20% and reduced SOC losses by 18% over 7 growing seasons as compared to sole mineral fertilizer. We conclude that combining organic and mineral N fertilizers can have significant positive effects on productivity and AE, but only improves the other two CSA pillars yield variability and SOC depending on organic resource input and quality. The findings of our meta- analysis help to tailor a climate smart integrated soil fertility management in SSA.

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Additional Info

Field Value
Creator Gram, Gil
Creator Affiliation International Institute of Tropical Agriculture (IITA)
Creator ID Type ORCID
Creator ID 0000-0002-9401-2621
Subject Vocab (AGROVOC/GACS/CAB) Soil,Maize,Millet,Sorghum,Nitrogen,Potassium,Phosphorus,Carbon,Fertilizer,Soil fertility,Yield,Cropping systems,Intercropping,monocropping,Climate,Lignin,Phenol,Crop rotation
Subject(s) Organic material
Publisher International Institute of Tropical Agriculture (IITA)
Contributor Person Roobroeck, Dries;Pypers, Pieter; Six, Johan;Merckx, Roel; Vanlauwe, Bernard
Contributor Role Project Leader
Contributor Project Lead Organisation Center International Institute of Tropical Agriculture (IITA)
Contributor Project Lead Center International Institute of Tropical Agriculture (IITA)
Contributor CRP CGIAR Research Program on Water, Land and Ecosystems (WLE)
Contributor Partner Not applicable
Contributor Donor Swiss Federal Institute of Technology Zurich (ETH Zurich)
Contributor Project Combining organic and mineral fertilizers as a climate-smart integrated soil fertility management practice in sub-Saharan Africa: a meta-analysis
Project ID
Contributor Affiliation International Institute of Tropical Agriculture (IITA)
Open-Access status Open Access
Production Date 2018-10-01
Embargo End Date
Content Type Dataset
File Format csv
Identifier Type DOI
Identifier https://doi.org/10.25502/r259-vt34/d
Identifier Citation
Source Combining organic and mineral fertilizers as a climate-smart integrated soil fertility management practice in sub-Saharan Africa: a meta-analysis
Language English
Relation Not applicable
Agroecological Zone Semiarid warm tropics
Coverage Region Sub-Saharan Africa
Coverage country Benin,Burkina Faso,Ethiopia,Ghana,Ivory Coast,Kenya,Malawi,Mozambique,Niger,Nigeria,Tanzania,Togo,Uganda,Zambia,Zimbabwe
Coverage Admin Unit Not applicable
Coverage Y (Latitude) 9.30769, 12.23833, 9.14500, 7.94653, 7.53999, -0.02356, -13.25431, -18.66569, 17.60779, 9.08200, -6.36903, 8.61954, 1.37333, -13.13390, -19.01544
Coverage X (Longitude) 2.31583, -1.56159, 40.48967, -1.02319, -5.54708, 37.90619, 34.30153, 35.52956, 8.08167, 8.67528, 34.88882, 0.82478, 32.29028, 27.84933, 29.15486
Coverage Start Date 1971-03-24
Coverage End Date 2018-10-07
Contact Gram, Gil; Visiting Scientist, International Institute of Tropical Agriculture (IITA)
Contact Email None
Restriction CC-BY 4.0
Email Permission None
Rights CC-BY 4.0