La riziculture d'altitude au Burundi : principales contraintes et diversification variétale

High-altitude rice cultivation in Burundi : major constraints and varietal diversification. Rice cultivation developed since 1980 in highland swamps of Burundi. The major constraints identified are low temperatures, resulting in an extension of the cultural cycle and a high sterility rate, and 2 diseases : bacterial sheath brown rot of rice and blast. The varietal diversification problem which was the most urgent to delimit seems to be well resolved now. The improvement programme has many types of different rices at his disposal ; their main characteristics are discussed in relation to the ecological zones for which they are recommended.