Designing low-input upland rice-based cropping systems with conservation agriculture for climate change adaptation: A six-year experiment in M’bé, Bouaké, Côte d’Ivoire

2022 ◽  
Vol 277 ◽  
pp. 108418
Author(s):  
Olivier Husson ◽  
Bernard F. Tano ◽  
Kazuki Saito
Nematology ◽  
2002 ◽  
Vol 4 (6) ◽  
pp. 661-669 ◽  
Author(s):  
Richard Plowright ◽  
Daniel Coyne

AbstractIn temperate climates, densities of plant-parasitic nematodes at or shortly before sowing are a useful predictor of their damage potential. Re-examination of data from nematode communities on upland rice in Côte d'Ivoire showed that interpretation of nematode pest potentials and the damage caused by either individual species, or by the community as a whole, is less simple. The numerical proportion of individual nematode species within a plant-parasitic nematode community, comprising Heterodera sacchari, Pratylenchus zeae , Meloidogyne incognita, Helicotylenchus dihystera, Mesocriconema tescorum and Xiphinema spp., changed with duration of the cropping cycle. The relative importance to the crop of the different species changed with time, and with development of the community structure over the course of the season. Analysis suggested that for H.sacchari, the mid-season population densities were most highly correlated with crop damage (yield loss) and therefore its damage potential for that particular season. The pest potential of other known rice pest species, such as M. incognita and P.zeae, was likely indicated earlier in the season, but the population increase of other nematode species in the community, particularly H. sacchari, compounded the interpretation of the data for other species. The use of single linear regression to assess the importance of individual nematode species conflicted with results of analyses using multiple stepwise regression, while use of cluster analysis permitted the identification of species groups at early and late stages in the cropping season.


Author(s):  
Brou Kouassi Guy ◽  
Oro Zokou Franck ◽  
Doga Dabé ◽  
Leki Konan Bertrand ◽  
Kouassi Koffi II Nazaire ◽  
...  

In Côte d'Ivoire, cashew cultivation faces several health obstacles. Among these problems, bacteriosis causes extensive damage to twigs, leaves and fruits, lowers the quality of crops and causes yield losses. The spread of this disease would be under the determination of the morphological characters of the cashew tree. The objective of this study is to search for agro-morphological determinants that influence the spread of bacteriosis in agroforestry systems in Côte d'Ivoire. To achieve this objective, 30 cashew trees spread across 26 agroforestry cashew orchards in the Korhogo, Sinématiali and Boundiali departments were chosen and geolocated. The study factor is the clone, consisting of 30 cashew genotypes, with 13 modalities. The collected data was subjected to descriptive analysis, correlation test, ACP and ascending hierarchical classification (CAH). The results obtained showed that the size and leaf areas and size of cashew trees are determinants that promote the spread of bacteriosis in these 30 cashew genotypes. Following this result, the ascending hierarchical classification (CAH) made it possible to screen the genotypes into three groups. These results should contribute to the agroecological management of bacteriosis, to enhance and intensify agroforestry cropping systems in Côte d'Ivoire.


2018 ◽  
Vol 14 (2) ◽  
pp. 134
Author(s):  
Kouassi Kan Martin ◽  
Kouassi Kouakou Lazare ◽  
Yao Koffi Blaise ◽  
Meledje N'diaye Hermann ◽  
Biemi Jean ◽  
...  

Climate change is a reality which affects many climatic variables, including precipitation. The objective of this article is to study the extreme rain variability from a historical database (1941 - 2000). For this purpose, eleven (11) rainfall indices were calculated at the Adiaké, Bianouan, Ayamé, and Agnibilekro rainfall stations in Côte d'Ivoire. Due to lack of data on daily rainfall on the Ghanaian section of watershed, nine (9) monthly precipitations indices were estimated from monthly rainfall at the Enshi and Buakuc stations. The trend analysis of the precipitations indices show that a generalized downward was most significant in Adiaké compared to other stations. Furthermore, indices extreme thresholding (P99, P99p, P99,5 and P99,5p) have experienced a stable trend and a stationary evolution. All steps were detected in the non-stationary indices mostly observed after 1980 (late break) and before 1960 (precocious break).


Author(s):  
N'da Samuel ◽  
Yao Marcel Konan ◽  
Trokourey Albert

This work aims to assess the simultaneous effects of the climate change and the hydromorphological modification of Vridi channel on its hydrochemistry. To best estimate, this fact, the seasonal dynamic of the particle size distribution, pH, redox potential, salinity, conductivity, moisture and organic matter contents of Vridi channel sediments have been followed and compared during two different annual periods, where the climate and the hydromorphology of this estuary have been different. The first annual period, covering the period from April 2014 to March 2015, has been characterized by a climatic regime close to the climatic normal of the study area and, this channel had its former hydromorphology. The second period annual, covering the period from October 2018 to September 2019, has been marked by a disruption of the climatic regime throughout Côte d'Ivoire, and this channel presented its modified hydromorphology. A monthly sampling has been done in this channel during each annual period. All These physical and chemical parameters have been determined by the corresponding AFNOR standards. Results have shown that these superficial sediments, with a predominantly sandy texture over the period from April 2014 to March 2015, have presented a texture predominantly of silt and clays over the period from October 2018 to September 2019. The climate change and the recent hydromorphological modification of this ecosystem had simultaneous very few effects on their pH and redox potential over the study period. On the other hand, they have caused an important increase in their salinity, moisture and organic matter contents and, a decrease in their electrical conductivity over the period from October 2018 to September 2019 relative to those determined in these substrates over the period of April 2014 to March 2015. This fact has certainly affected its biodiversity, especially that of its benthic fauna.


2016 ◽  
Vol 2016 (1) ◽  
Author(s):  
Kouassi Richard M'Bra* ◽  
Brama Koné ◽  
Ibrahima Sy ◽  
Jacques André N’Dione ◽  
Nagnin Soro ◽  
...  

Hydrology ◽  
2017 ◽  
Vol 4 (1) ◽  
pp. 18 ◽  
Author(s):  
Gneneyougo Soro ◽  
Affoué Yao ◽  
Yao Kouame ◽  
Tié Bi

Author(s):  
Benedictus Freeman ◽  
A. Townsend Peterson

Primary biodiversity data, data documenting presences of particular species at particular sites at a point in time, available in standard digital formats, provide the basis for many quantitative studies that can inform effective and reliable national, regional, and global biodiversity conservation decisions. However, these datasets are often unavailable, incomplete, or unevenly distributed across regions and landscapes. We assessed the survey completeness and gaps in current knowledge of birds of West Africa, using digital, accessible primary biodiversity data, obtained from the Global Biodiversity Information Facility and eBird. Additionally, using ecological niche modeling approaches, we modeled the current and potential future geographic distributions of a diverse suite of range-restricted and ecologically important bird species, and used the resulting models to identify priority areas for conservation and future surveys (Fig. 1). The survey completeness and gap analyses revealed marked spatial, seasonal, and temporal (historical) gaps and biases in the coverage of bird records across the region (Fig. 1). Well-surveyed sites were clustered around points of access such as major cities, roads, and national reserves or parks, mainly in Ghana, The Gambia, Senegal, Côte d’Ivoire, and Cameroon (Fig. 1). For our distributional analysis, we found broad present-day potential distributions with respect to climate. Future potential distributions, taking into account climate change processes, tended to be still-broader and more inclusive than present-day distributions, so climate-change-driven range losses and gains were minimal. Our models identified Liberia, southeastern Sierra Leone, southwestern Côte d’Ivoire, and southwestern Ghana to have high climate suitability in the present and in the future for most species. These results illustrate the spatial and temporal biases and gaps in West African bird data, and emphasize the need to promote high-quality biodiversity data mobilization and publication in West Africa and by extension the developing world. To address these biases at the regional level, research institutions and individuals need to engage in more systematic planning and biodiversity research, taking into account the potential for spatial, temporal, and seasonal biases.


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