| الوصف: |
Perennial rice varieties show promise in meeting the conflicting needs of reducing input use while increasing agricultural production in southern China. However, in the tropics, little is known about the performance of perennial rice varieties and the appropriate cropping system for perennial rice cultivation. The objectives of this study were to evaluate the performance of perennial rice varieties with different cropping systems under irrigated conditions in West Africa. Experiments were conducted over two years at Mbe, Côte d'Ivoire, and Ndiaye, Senegal located in the sub-humid and Sahelian climate zones, respectively. The treatments consist of three cropping systems [transplanted rice followed by two ratoon crops per year (rice – ratoon– ratoon per year), transplanted rice followed by 6 ratoon crops over two years (rice – continuous ratoon rice), and transplanted rice double cropping per year), and six varieties (five perennial rice varieties: PR101, PR107, PR23, PR24, and PR25 and the local check: WITA 9 and Sahel 108 in Mbe and Ndiaye, respectively). There was significant variety and cropping system interaction on cumulative grain yield over two years in both sites. At Mbe, cumulative grain yield was the highest in the rice double cropping with PR23, PR25, and WITA9 and the rice–ratoon–ratoon per year system with PR23 and PR25. In Ndiaye, rice double cropping with PR107 and Sahel 108 and rice–ratoon–ratoon per year system with PR25 and PR107 had the highest cumulative grain yield. The percentage of regrown plants was the main driver of the grain yield of the ratoon crops. The rice– ratoon–ratoon per year system with PR23 and PR25 produced the highest labor productivity and net profit at Mbe, whereas the ratoon systems produced lower labor productivity and net profit than rice double cropping at Ndiaye, irrespective of rice varieties. Rice–ratoon– ratoon per year system with PR23 and PR25 could be recommended to smallholder farmers to increase the labor productivity and net profit of rice in the West African ... |