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Dissertation
Comparative study of biochar amendment effects on nutrient cycling in contrasting pedological context of Koumbia, Burkina Faso
Authors: --- --- --- --- --- et al.
Year: 2019 Publisher: Liège Université de Liège (ULiège)

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Abstract

L’intérêt pour le biochar dans la communauté scientifique est croissant, à la fois pour son
potentiel d’atténuation du changement climatique et pour ses propriétés agronomiques. Cependant,
peu d’études se sont concentrées sur ses impacts sur les cycles des nutriments en fonction de la
pédodiversité.
Dans cette études, trois types de sols contrastés (FLIPP : Plinthosol épipétrique, FLC : Lixisol
ferrique, HPGS : Gleysol eutrique) de la région de Koumbia au Burkina Faso ont été utilisés afin de
mener une expérience en pot visant à déterminer les effets d’un amendement en biochar activé à
l’urine (2,5 t ha-1) sur les cycles des nutriments N, P et K et leurs impacts sur la production de biomasse
d’une culture de maïs (Zea mays L.). Trois différentes modalités d’amendement en biochar (biochar de
tiges de coton : C, de balles de riz : R, et témoin : T) et deux taux de fertilisation en NPK (100 et 150
kg ha-1) ont été considérées. Les quantités de nutriments apportées par le biochar, contenues dans le
sol, perdues par lixiviation et absorbées par les plantes ont été déterminées afin d’évaluer l’impact des
différents traitements sur les cycles des éléments N, P et K au sein d’un agroécosystème tropical.
Les résultats ont montré des réponses variables à l’amendement en biochar selon les types de
sols. Le biochar a eu un impact plus faible sur les sols FLIPP, mais a tout de même augmenté la biomasse
aérienne jusqu’à 43% avec le traitement R-150. Le traitement C-150 a amélioré la production de
biomasse de 85% dans les sols FLC, et R-150 de 65% pour les sols HPGS, par rapport aux pots de
référence amendés selon les pratiques agricoles conventionnelles (T-150). Ces résultats sont expliqués
par un changement de dynamiques des nutriments engendré par l’amendement en biochar, ce qui
montre qu’un apport raisonné en biochar peut avoir un impact important sur le rendement et sur
l’efficacité de l’utilisation des nutriments. Interest in biochar in the scientific community is rising, both for its potential to mitigate climate
change and for its agronomic properties. However, few studies focused on its impacts on nutrient
cycling as a function of pedodiversity.
In this study, three contrasted soil types (FLIP: epipetric Plinthosol, FLC: ferric Lixisol, HPGS:
eutric Gleysol) from the region of Koumbia in Burkina Faso were selected to conduct a pot experiment
to determine the effects of a of urine-enhanced biochar amendment (2.5 t ha-1) on N, P and K nutrient
dynamics and their impact on biomass production in a maize crop (Zea mays L.). Three different
biochar amendment modalities (cotton stalks biochar: C, rice husks: R, and control: T) and two NPK
fertilization rates (100 and 150 kg ha-1) were considered. The amounts of nutrients supplied by biochar,
contained in soils, lost by leaching and uptaken by plants were assessed in order to determine the
impacts of the different treatments on the N, P and K cycles in a tropical agroecosystem.
Results showed variable responses to the biochar amendment depending on the soil type.
Biochar had the smallest effect on FLIPP soils, but still increased above-ground biomass up to 43% with
treatment R-150. Treatment C-150 improved biomass production by 85% in FLC soil, and R-150 by 63%
in HPGS soils, all compared to the reference pots with conventional farming practices (T-150). These
findings were explained by the changing nutrient dynamics caused by biochar amendment, which
shows that a moderate supply of biochar can lead to a substantial impact on yield and to an improved
nutrient use efficiency


Periodical
Revista brasileira de ciência do solo.
Author:
ISSN: 01000683 18069657 Year: 1977 Publisher: Campinas, Sociedade Brasileira de Ciência do Solo.

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Keywords

Soil science --- Soils --- Pédologie --- Sols --- Periodicals --- Périodiques --- Agriculture Sciences --- Agricultural Engineering --- Crops, Crop Production and Protection --- General and Others --- Soil Chemistry, Microbiology, Fertility & Fertilizers --- Engineering --- Agriculture Sciences. --- Agricultural Engineering. --- Engineering. --- agricultural sciences --- Earth (Soils) --- Mold, Vegetable --- Mould, Vegetable --- Soil --- Vegetable mold --- Agricultural resources --- Plant growing media --- Regolith --- Land capability for agriculture --- agrology --- edaphology --- pedology --- Natural Resources, Earth and Environmental Sciences --- pedodiversity --- soil --- soil analysis --- soil biology --- soil chemistry --- soil classification --- soil ecology --- soil erosion models --- soil management --- soil mechanics --- soil morphology --- soil physics --- soil processes and phenomena --- soil productivity status --- soil quality --- soil resources --- soil surveys --- geology --- hydrology --- pedological techniques --- soil-plant-atmosphere interactions --- Soil science. --- Soils. --- Brazil. --- Pedology (Soil science) --- Agriculture --- Earth sciences --- al-Barāzīl --- Barāzīl --- Brasil --- Brasile --- Brasilia --- Brasili --- Brasilien --- Brazili --- Brazili Federativlă Respubliki --- Brazilia --- Brazilii͡ --- Brazilii͡a Federativ Respublikaḣy --- Braziliya --- Braziliya Federativ Respublikası --- Brazilská federativní republika --- Brazylia --- Brésil --- Burajiru --- Federale Republiek van Brasili --- Federative Republic of Brazil --- Federativna republika Brazil --- Federativna republika Brazilii͡ --- Federat͡siėm Respublikė Brazil --- Fedėratyŭnai͡a Rėspublika Brazilii͡ --- Gweriniaeth Ffederal Brasil --- Pa-hsi --- Pa-se --- Pa-se Liân-pang Kiōng-hô-kok --- Pederatibong Republika sa Brasil --- Pindorama --- República Federal del Brasil --- Republica Federale di u Brasile --- Republica Federativa del Brazil --- República Federativa do Brasil --- Rèpublica fèdèrativa du Brèsil --- Republik Kevreel Brazil --- République fédérative du Brésil --- Tantasqa Republika Wrasil --- Tetã Pindorama --- Wrasil

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