Rubber: Natural Rent, Capitalization Rent? West-Central Côte d’Ivoire and Southern Thailand

The Lobo watershed located in the west-central part of Côte d'Ivoire is an area with high agricultural potential, influenced by climate variations and changes that reduce crop yields. The objective of this study is to analyse trends in ETCCDI extreme rainfall indices from rainfall data from 1984 to 2013 using ClimPACT2 software. This study shows that the trend of the indices: number of consecutive wet days (CWD), number of rainy days (R1mm) and the cumulative annual total rainfall (PRCPTOT) is decreasing. On the other hand, the number of consecutive dry days (CDD) is on the rise. In general, the whole basin has experienced a decrease in rainfall as well as wet sequences and an increase in dry sequences. These different trends observed in this study are more pronounced in the northern half of the watershed.

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Impact of Local Global Warming on Rainfall and Annual Cocoa Water Requirements in the Regions of Lôh-Djiboua and Gôh in West-central Côte d'Ivoire

International Journal of Environment and Climate Change ◽

10.9734/ijecc/2019/v9i930135 ◽

2019 ◽

pp. 503-517 ◽

Cited By ~ 1

Author(s):

Jean-Noël Ehounou ◽

Brou Kouamé ◽

Mathias G. Tahi ◽

Emmanuel K. Kassin ◽

Charles S. Dékoula ◽

...

Keyword(s):

Interannual Variability ◽

Cote D'ivoire ◽

Côte D’Ivoire ◽

Rainfall Regime ◽

Water Requirements ◽

Cote D’Ivoire ◽

Cumulative Rainfall ◽

West Central ◽

Côte D'ivoire ◽

The Impact

Aims: To understand the role of the interannual variability of cumulative rainfall and maximum dry sequences in cocoa production in the Centre-Ouest, one of the cocoa basins in Côte d'Ivoire, in order to propose technical routes more adapted to current rainfall conditions. Study Design: Collection, analysis and processing of daily rainfall data collected by the rain gauges at Divo and Gagnoa stations. Location and Duration of Studies: Divo Cocoa Research Station of the National Center for Agricultural Research, between January 2017 and June 2019. Methodology: The rainfall regime of each locality was determined to assess the impact of rainfall changes on the seasonality of rainfall. The interannual variability of rainfall was studied from the reduced centred rainfall indices. The break years in the time series were detected at both stations from the Khrono Stat software. The interannual cumulative rainfall were analysed for each station and compared to the minimum threshold allowed for cocoa trees. The means of the maximum interannual dry sequences and their probabilities of occurrence were determined using the agrometeorological software called Instat + Version 3.37. Results: The rainfall regime in the area studied (west-central Côte d'Ivoire) has not been modified by the post-rupture rainfall recession as is the case in other parts of the country; it remains a bimodal system characterized by two rainy seasons and two dries during the year. The Divo and Gagnoa regions have been facing a general recession in rainfall since 1966 in Gagnoa and 1972 in Divo. However, the locality of Gagnoa has experienced an increase in rainfall since 2000. Most of the rupture detection tests identified rainfall rupture dates identical to those indicated by the interannual variability highlighted by the rainfall indices. In Gagnoa and Divo, the interannual cumulative rainfalls after the years of rainfall break are reduced compared to those before these rainfall accidents. This situation has led to an increase in the maximum interannual dry sequences in the departments studied. Conclusion: Local climate change has created difficult rainfall conditions after years of rainfall break for cocoa trees as their water needs are increasingly reduced, especially in Divo in Lôh-Djiboua where the downward trend in rainfall has been continuous since 1972. In Gagnoa since the beginning of this century, there has been a new wet period that allows rainfall to adequately meet the cocoa tree's water requirements.

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Sanitary Diagnosis of Cotton Cultivation in the West Central Region of Cote D'ivoire

International Journal of Applied Sciences and Biotechnology ◽

10.3126/ijasbt.v6i2.20430 ◽

2018 ◽

Vol 6 (2) ◽

pp. 152-157

Author(s):

Tonessia Dolou Chalotte ◽

Kotchi Valère ◽

Gore Bi Boh Nestor ◽

Kouassi Koffi Djinkin ◽

Soro Lacina ◽

...

Keyword(s):

Cote D'ivoire ◽

Côte D’Ivoire ◽

Diagnostic Study ◽

Zonocerus Variegatus ◽

The West ◽

Cote D’Ivoire ◽

West Central ◽

Côte D'ivoire ◽

Cotton Plants ◽

Set Up

In order to contribute to cotton cultivation sustainability in west central Côte d'Ivoire, a phytosanitary diagnostic study was conducted in 11 plots. It consisted of monitoring the sanitary condition of 10 rural plots and an experiment plot set up at the Research Farm of University Jean Lorougnon Guédé of Daloa according to the regular and careful inspection of cotton seed germination, seedling health and cotton plants throughout the growing season. The results obtained indicated that the cotton varieties used by farmers had very low germination with maximum number of healthy seedlings of 43.75 % in an experiment condition. Highest number of infected seedlings (24-51%) showing characteristic symptoms of seedling blight leading to their death was observed. Under cultivation, a variety of pests was identified on cotton plants. The most important were Bemisia tabaci, Jacobiella fasciali, Helicoverpa armigera, Dysdercus sp, Earias sp, Zonocerus Variegatus, Haritalodes derogata. The Species Zonocerus Variegatus and Haritalodes derogata proved to be devastating on the experimental plot where 100% loss was recorded. The main disease observed at flowering stages in cotton plants was cotton virescence disease. Although lowly infection were observed (0.11 -0.35%) cotton cultivation monitoring and management must be set up so as to prevent its expansion in the west central. Theses finding gives useful information to farmers to reduce cotton yield losses in west central Côte d'Ivoire.Int. J. Appl. Sci. Biotechnol. Vol 6(2): 152-157

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