This article examines the water deficit s which pineapple is subject in the production area in Benin. Specifically it characterizes the variability of rainfall and that of the water from 1951 to 2010 on the soils of the Plateau of Allada under pineapple cultivation. This feature is based on the reduced centered abnormalities. We detect ruptures by the test Pettitt. The formula of Hillel allowed the estimation of the water balance, and that of the Hazen the frequency overtake various levels of water deficits. The results show that globally since 1980, seasons start with 5 to 25 days late and get shorter from 20 to 35 days. In addition, atmospheric forcing has more affected the components of accumulated rainfall than the same combination. This result in a regression of the average annual total (4% at Niaouli and 8% at Ouidah) and the deficit of the water balance even though the average rainfall exceeds that of the water needs of pineapple. Nevertheless, the quality of the short rainy season is improving and the water deficits of this season have a downward trend unlike the big one. The year

The study aims to deepen the knowledge on the integrated management of water resources in the basin of the Niger River in Benin. It was conducted using descriptive methods, hydrological and piezometric statistics.. The results show that climate plan period 1951-2005 was marked by a rain drop out of post- 17% higher average temperatures of 1.8

This study analyzes the different levels of risk linked to the choice of management of agricultural calendar for maize production in southern Benin. For this purpose a series of simulations of potential yields of the variety DMR-ESR-W of maize was carried out with the model SARRA-H V3.2 by shifting of an decade (10 days), from February to November, the automatic search of the sowing date between 1971 and 2010. Thus, it has been possible to show the seasonal dynamics of the percentage of successful sowing, of potential yield and of grain desiccation date depending on the sowing date. It appears that the maximums of percentage of successful sowing and of potential yield are obtained when it sow at the start of the rainy season. However, considering biotic constraints on the choice of the sowing date, it appears that the sowing date becomes: the first half of May for the long rainy season and the first half of September for the short rainy season. However, between the dates of onset of rains (early April) and sowing date (early May) for the long rainy season, there is a lag of about one month, which raises the question of the relevance of adopting varieties maize 90 days for long rainy season as an Adaptation.