Study of the combined effect of sowing date and sowing method on vegetative development of new rice paddy (Oryza sativa) varieties in Senegal River Valley under low temperatures

Rice paddy cultivation in Senegal is subject to climatic fluctuations that affect its vegetative development. Although conditions are a concern, we hypothesized the new rice ISRIZ would be better adapted these and allow double cropping. We studied behavior according date mode sowing under low temperatures. An experiment was carried out split-split plot design with sowings staggered every three weeks (18 dates), two modes (Broadcast, transplanting). Data collected included plant height, number of tillers, 50% flowering, 80% maturity. The results showed method had significant effects on morphology varieties. These were exacerbated by temperatures, resulting lengthening cycle Some varieties performed well flowering cycles less than 100 days best planting period during hot dry season between February March, while winter, July August recommended. In cold, practice transplanting adapted. This study identified could cropping context variability. Key words: Irrigated rice, dates,