[ Fonctionnement biologique des sols sous jachères de caféiers et cacaoyers dans le département de Daloa (Cenre-Ouest de la Côte d’Ivoire) ]
Volume 66, Issue 1, April 2023, Pages 161–170
Kacou Bony1, Ferdinand Gohi Bi ZRO2, and Martinez Arnauth Guéi3
1 Département d’Agropédologie, Université Jean Lorougnon Guedé, Daloa, Côte d’Ivoire
2 UFR Agroforesterie, Université Jean Lorougnon Guédé, Côte d’Ivoire
3 Département d’Agropédologie, Université Jean Lorougnon Guedé, Daloa, Côte d’Ivoire
Original language: French
Copyright © 2023 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
In Daloa, Côte d’Ivoire, many coffee and cocoa plantations that have fallen into decline and been left fallow are being reused. In order to prevent the failure of the planned crops, this study aims to determine the biological functioning of these soils, which is essential for developing sustainable management strategies for them. Seven fallows older than ten years were identified. In each of them, a plot of 10,000 m2 was delimited and four monoliths were isolated. Each monolith was sorted in order to extract the organisms, identify them and calculate their density. A soil sample was also taken from each stratum for analysis. The biological functioning of the soil was determined by considering that the density of fauna is an indicator variable of the biological fertility of the soil, which is then correlated with CEC and texture, two variables considered to explain soil fertility in general. The results show that the density of the macrofauna constituting the soil engineers varies little on the sites, maintaining a relationship with either the sand or silt content of the soil, or with the CEC of the soil, or both variables. Soils where the CEC has been improved by the action of fauna are likely to function better and the types of fauna involved have been identified as the main biological actors in the fertilisation of the soils studied.
Author Keywords: soil, biological functioning, soil fauna, organic matter, fallow land, Daloa.
Volume 66, Issue 1, April 2023, Pages 161–170
Kacou Bony1, Ferdinand Gohi Bi ZRO2, and Martinez Arnauth Guéi3
1 Département d’Agropédologie, Université Jean Lorougnon Guedé, Daloa, Côte d’Ivoire
2 UFR Agroforesterie, Université Jean Lorougnon Guédé, Côte d’Ivoire
3 Département d’Agropédologie, Université Jean Lorougnon Guedé, Daloa, Côte d’Ivoire
Original language: French
Copyright © 2023 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
In Daloa, Côte d’Ivoire, many coffee and cocoa plantations that have fallen into decline and been left fallow are being reused. In order to prevent the failure of the planned crops, this study aims to determine the biological functioning of these soils, which is essential for developing sustainable management strategies for them. Seven fallows older than ten years were identified. In each of them, a plot of 10,000 m2 was delimited and four monoliths were isolated. Each monolith was sorted in order to extract the organisms, identify them and calculate their density. A soil sample was also taken from each stratum for analysis. The biological functioning of the soil was determined by considering that the density of fauna is an indicator variable of the biological fertility of the soil, which is then correlated with CEC and texture, two variables considered to explain soil fertility in general. The results show that the density of the macrofauna constituting the soil engineers varies little on the sites, maintaining a relationship with either the sand or silt content of the soil, or with the CEC of the soil, or both variables. Soils where the CEC has been improved by the action of fauna are likely to function better and the types of fauna involved have been identified as the main biological actors in the fertilisation of the soils studied.
Author Keywords: soil, biological functioning, soil fauna, organic matter, fallow land, Daloa.
Abstract: (french)
A Daloa en Côte d’Ivoire, de nombreuses plantations de caféiers et cacaoyers tombées en déclin et laissées en jachères sont en passe d’être réutilisées. Pour prévenir un échec des cultures envisagées, cette étude vise à déterminer le mode de fonctionnement biologique de ces sols, chose indispensable pour élaborer à leur endroit des stratégies de gestion durable. Ainsi, sept jachères de plus de dix ans ont été identifiées. Dans chacune d’elle, une parcelle de 10000 m2 a été délimitée; quatre monolithes y ont été isolés. Chaque monolithe a été trié afin d’en extraire les organismes, les identifier et calculer leur densité. Aussi, un échantillon de sol a-t-il été constitué par strate aux fins d’analyses. Le mode de fonctionnement biologique du sol a été déterminé en considérant que la densité de la faune est une variable indicatrice de la fertilité biologique des sols, qui alors, est mise en corrélation avec la CEC et la texture, deux variables considérées comme explicatrices de la fertilité des sols en général. Les résultats montrent que la densité de la macrofaune constituant les ingénieurs du sol varie peu sur les sites en maintenant une relation soit avec les teneurs en sables ou limons du sol, soit avec la CEC du sol, ou les deux variables à la fois. Les sols où la CEC a été bonifiée par l’action des faunes ont a priori un meilleur fonctionnement et les types de faunes impliqués ont été identifiés comme les principaux acteurs biologiques de la fertilisation des sols étudiés.
Author Keywords: sol, fonctionnement biologique, faune du sol, matière organique, jachère, Daloa.
How to Cite this Article
Kacou Bony, Ferdinand Gohi Bi ZRO, and Martinez Arnauth Guéi, “Biological functioning of soils under coffee and cocoa tree fallows in the department of Daloa (West-Central of Côte d’Ivoire),” International Journal of Innovation and Scientific Research, vol. 66, no. 1, pp. 161–170, April 2023.
