eprintid: 11421
rev_number: 10
eprint_status: archive
userid: 3170
dir: disk0/00/01/14/21
datestamp: 2020-03-30 11:38:13
lastmod: 2020-03-30 11:38:13
status_changed: 2020-03-30 11:38:13
type: conference_item
metadata_visibility: show
creators_name: Worou, O N
creators_name: Kone, A W
creators_name: Tondoh, J E
creators_name: Guei, A M
creators_name: Edoukou, F E
icrisatcreators_name: Worou, O N
affiliation: ICRISAT (Bamako)
affiliation: UFR des Sciences de la Nature, Université Nangui Abrogoua, Abidjan, Côte d’Ivoire
affiliation: UFR d’Agroforesterie, Université Jean Lorougnon Guédé, Daloa, Côte d’Ivoire
affiliation: Centre de Recherche en Ecologie, Abidjan, Côte d’Ivoire
country: Mali
country: cote d'Ivoire
title: Modeling the contribution of ecological agriculture for climate change mitigation in cote d'Ivoire
ispublished: pub
subjects: CPM
subjects: s2.8
divisions: CRPS1
full_text_status: public
pres_type: poster
keywords: Conservation agriculture, Sensitivity analysis, Climate, DSSAT, West Africa
abstract: The use of crop models is motivated by the prediction of crop production under climate
change and for the evaluation of climate risk adaptation strategies. Therefore, in the present
study the performance of DSSAT 4.6 was evaluated in a cropping system involving integrated
soil fertility management options that are being promoted as ways of adapting agricultural
systems to improve both crop yield and carbon sequestration on highly degraded soils
encountered throughout middle Côte d’Ivoire. Experimental data encompassed two seasons
in the Guinea savanna zone. Residues from the preceding vegetation were left to dry on plots
like mulch on an experimental design that comprised the following treatments: (i) herbaceous
savanna-maize, (ii)10 year-old of the shrub Chromolaena odorata fallow-maize (iii) 1 or 2
year-old Lalab pupureus stand-rotation, (iv) the legume L. pupureus -maize rotation; (v) continuous
maize crop fertilized with urea; (vi) continuous maize crop fertilized with triple superphosphate;
(vii) continuous maize crop, fertilized with both urea and triple superphosphate
(TSP); (viii) continuous maize cultivation. The model’s sensitivity analysis was run to figure
out how uncertainty of stable organic carbon (SOM3) can generate variation in the prediction
of soil organic carbon (SOC) dynamics during the monitoring period of two years, within
the first soil layer and to estimate the most suitable value. The observed variations were of
0.05 % in total SOC within the short-term and acceptable dynamics of changes were obtained
for 0.80% of SOM3. The DSSAT model was calibrated using data from the 2007-2008
season and validated against independent data sets of yield of 2008-2009 to 2011-2012
cropping seasons. After the default values for SOM3 used in the model was substituted by the
estimated one from sensitivity analysis, the model predicted average maize yields of 1 454
kg ha-1 across the sites versus an observed average value of 1 736 kg ha-1, R2 of 0.72
and RMSE of 597 kg ha-1. The impact of fallow residues and cropping sequence on maize
yield was simulated and compared to conventional fertilizer and control data using historical
climate scenarios over 12 years. Improving soil fertility through conservation agriculture cannot
maintain grain yield in the same way as conventional urea inputs, although there is better
yield stability against high climate variability according to our results.
date: 2019
date_type: published
pagerange: 846-846
event_title: 4th World Congress on Agroforestry
event_location: Montpellier, France
event_dates: 20-22 May 2019
event_type: conference
refereed: TRUE
official_url: https://www.alphavisa.com/agroforestry/2019/documents/Agroforestry2019-Book-of-Abstract-v1.pdf
citation:   Worou, O N and Kone, A W and Tondoh, J E and Guei, A M and Edoukou, F E  (2019) Modeling the contribution of ecological agriculture for climate change mitigation in cote d'Ivoire.  In: 4th World Congress on Agroforestry, 20-22 May 2019, Montpellier, France.     
document_url: http://oar.icrisat.org/11421/1/Agroforestry2019-Book-of-Abstract-v1.pdf