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Rice is the basic cereal of the populations of the areas of Tandjile and Western Mayo Kebbi, in the south of Chad. The rice productivity is, however, low: less than 1 t/ha. This is related to several factors, of which the strong infestation of rice plantation into adventitious and lack of improved varieties with high productivity. Among the bad frequent grasses, harmful for cultivated rice, the species like Oryza sativa, Oryza barthii and Oryza longistaminata show the strong dynamic ones of infestation in the rice plantations of flooded plains of the areas of Tandjile and Western Mayo Kebbi. The agromorphological characterization of the samples of the prospection-collection from October 2005 to Mars 2006 revealed the existence of three types of rice in the zone: wild rice, adventitious rice and cultivated rice. The group of cultivated rice breaks up into three pennies groups on the basis of duration of sowing-heading cycle. The objective of this study was to characterize the agromorphological features of these groups.

Agromorphological characterization of some rice species in the main rice cropping area of Chad