Predicting biochar production and carbon sequestration for soil productivity in eastern Uganda

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cg.authorship.typesCGIAR and developing country instituteen
cg.contributor.affiliationMakerere Universityen
cg.contributor.affiliationInternational Institute of Tropical Agricultureen
cg.coverage.countryUganda
cg.coverage.iso3166-alpha2UG
cg.coverage.regionAfrica
cg.coverage.regionEastern Africa
cg.placeKampala, Ugandaen
cg.subject.iitaAGRONOMYen
cg.subject.iitaFARMING SYSTEMSen
cg.subject.iitaFOOD SECURITYen
cg.subject.iitaGRAIN LEGUMESen
cg.subject.iitaPLANT BREEDINGen
cg.subject.iitaPLANT PRODUCTIONen
cg.subject.iitaSMALLHOLDER FARMERSen
cg.subject.iitaSOIL FERTILITYen
cg.subject.impactAreaNutrition, health and food security
cg.subject.sdgSDG 2 - Zero hungeren
dc.contributor.authorNakubulwa, D.en
dc.date.accessioned2022-06-20T13:15:58Zen
dc.date.available2022-06-20T13:15:58Zen
dc.identifier.urihttps://hdl.handle.net/10568/119872
dc.titlePredicting biochar production and carbon sequestration for soil productivity in eastern Ugandaen
dcterms.abstractBiochar, a product of biomass gasification is used to sequester carbon in soils for long periods of time and intensification of agricultural productivity. Crop residues are an important source of biomass for biochar production but availability in smallholder farming systems across Sub Saharan Africa (SSA) is unknown due to the cost and labor involved in obtaining related empirical data. The study presented here was carried out in Pallisa district, Uganda and (1) mapped crop residue yields and current usages, (2) developed allometric equations to quantify crop residues and (3) assessed the amounts of biochar carbon that can potentially be sequestered. The study focused on residues from major staple crops being; maize, millet, rice, sorghum and groundnut considering 12 mono-cropped farmer fields per crop, over two growing seasons. It was estimated that the availability of raw residues measured on average; 3.71, 4.99, 5.5, 5.87 and 12.96 tons ha-1 for groundnut, maize, sorghum, rice and finger millet respectively. Allometric models based on plant height and density without interaction were found to provide reliable estimates of the total yield of individual crop residues. Hence, these tools can help save time and cost to map the sources of crop residues at large scale. The amounts of carbon that would be sequestered through crop residue derived biochar were determined using a soil carbon balance model that accounts for the loss over time. Results show that residues from millet production had the highest potential for sequestering carbon, measuring on average 3.35 tons C ha-1 yr-1, whereas that of residues from maize, sorghum and rice amounted to 1.12 tons C ha-1 yr-1. This supports the viability for producing biochar from crop residues and sequestering carbon in these smallholder farmer systems.en
dcterms.accessRightsLimited Access
dcterms.audienceScientistsen
dcterms.bibliographicCitationNakubulwa, D. (2019). Predicting biochar production and carbon sequestration for soil productivity in eastern Uganda. Kampala, Uganda: Makerere University (67 p.).en
dcterms.descriptionIITA supervisor: Roobroeck, D.en
dcterms.extent67 p.en
dcterms.issued2019-12
dcterms.languageen
dcterms.licenseCopyrighted; all rights reserved
dcterms.publisherMakerere Universityen
dcterms.subjectgrain legumesen
dcterms.subjectagricultural productivityen
dcterms.subjectintensificationen
dcterms.subjectsoil fertilityen
dcterms.subjectfarming systemsen
dcterms.subjectsmallholdersen
dcterms.subjectsubsaharan africaen
dcterms.subjectugandaen
dcterms.typeThesis

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