**2. Materials and methods**

The study was conducted near the "M'POUTO village "located around the lagoon Ebrié next to the district of Riviera-Golf of the city of Abidjan, the economic capital of Côte d'Ivoire.

Photo 1. M' POUTO village; district of Riviera-Golf in Abidjan City. Côte d'Ivoire

The experimental zone is in full sub-equatorial climate with surrounding vegetation mostly composed of tall grasses and scattered bushes (Photo 1).

The area is characterized by hydromorphic and sandy soils (DUCHAUFOUR Ph, 1997). The climatic conditions of the study zone is characterized by four seasonal cycles:

A big or long rainy season from May to July and a small shorter rainy season from October to November followed by a long dry season from December to April and a short dry season from August to September. The average annual rainfall is about 2500 millimeters with a relative humidity of 80 to 90 %. The maximum and minimum average air temperatures are respectively 33°C and 21°C.
