Browsing Norwegian Geotechnical Institute (NGI) Digital Archive by Author "Obia, Alfred"
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Biochar dispersion in a tropical soil and its effects on native soil organic carbon
Obia, Alfred; Lyu, Jing; Mulder, Jan; Martinsen, Vegard; Cornelissen, Gerard; Smebye, Andreas; Zimmerman, Andrew R. (Peer reviewed; Journal article, 2024) -
Effect of biochar on crust formation, penetration resistance and hydraulic properties of two coarse-textured tropical soils
Obia, Alfred; Børresen, Trond; Martinsen, Vegard; Cornelissen, Gerard; Mulder, Jan (Peer reviewed; Journal article, 2017)Biochar (BC) has been reported to improve a number of soil structural and hydraulic properties but detailed studies are scant on how BC affects crust formation, penetration resistance, water repellency and saturated hydraulic ... -
Effect of Soil pH Increase by Biochar on NO, N2O and N2 Production during Denitrification in Acid Soils
Obia, Alfred; Cornelissen, Gerard; Mulder, Jan; Dörsch, Peter (Journal article, 2015) -
Effect of Soil pH Increase by Biochar on NO, N2O and N2 Production during Denitrification in Acid Soils
Obia, Alfred; Cornelissen, Gerard; Mulder, Jan; Dörsch, Peter (Journal article, 2015) -
Significant build-up of soil organic carbon under climate-smart conservation farming in Sub-Saharan Acrisols
Martinsen, Vegard; Munera-Echeverri, Jose L; Obia, Alfred; Cornelissen, Gerard; Mulder, Jan (Journal article; Peer reviewed, 2019)Conservation farming (CF) involving minimumtillage, mulching and crop rotation may offer climate change adaptation and mitigation benefits. However, reported effects of CF, as applied by smallholders, on storage of soil ... -
The potential of biochar in improving drainage, aeration and maize yields in heavy clay soils
Obia, Alfred; Mulder, Jan; Hale, Sarah; Nurida, Neneng; Cornelissen, Gerard (Peer reviewed; Journal article, 2018)Heavy clay soils are globally widespread but their poor drainage and poor aeration limit their use for agriculture. This study was designed to test the effect of the amendment of biochar (BC) from woody shrubs on ... -
Vertical and lateral transport of biochar in light-textured tropical soils
Obia, Alfred; Børresen, Trond; Martinsen, Vegard; Cornelissen, Gerard; Mulder, Jan (Peer reviewed; Journal article, 2016)Field experiments were conducted in Arenosols (loamy fine sand) and Acrisols (sandy loam) in Zambia to quantify vertical and lateral transport of biochar (BC) using the BC and soil 13C isotope signatures and total organic ...