Risques agro-météorologiques et production du riz pluvial (Oryza spp.) au Bénin (Afrique de l’Ouest)

Ondertitel:Agro-climatic risks and producing of rainfed rice (Oryza spp.) in Benin

Irregular and reduced rainfall are major concerns for rainfed rice producers. The objective of this study was to analyze the yearly variability and trends of the onset and the end of rains as well as of total rainfall over a period of 46 years in Glazoue, Malanville and Tanguiéta (Benin) in order to better determine the appropriate dates for rainfed rice sowing. For this purpose, daily rainfall data (1970-2016) were collected from three weather stations located in these localities from the Benin National Weather Agency. Descriptive statistics were used to compare rainfall variability. Trends were assessed by Mann-Kendall test and Sen’s Slope. The probabilities of occurrence of a dry period were calculated using the Markov chain of order 1. Unlike the end of the rains, where little variability was observed, a significant variability in the onset of rains with late (4%) and early (17%) trends was found. Depending on the rice variety, the period from 9 May to 3 July is appropriate for rainfed rice sowing in Tanguiéta. In the case of, Glazoue and Malanville, no appropriate date for rainfed rice sowing was observed, due to the very high probabilities (0.7 to 1) of dry period (> 5 days) at flowering stage, which compromising its productivity. These results should encourage rice producers to grow varieties with short < 100 days maturing dates and can guide them in the choice of suitable planting dates and suitable varieties of rainfed rice.

Jaar van publicatie:2021

Toegankelijkheid:Open