Grain Yield Performance of Selected Lowland NERICA and Modern Asian Rice Genotypes in West Africa

• Published in: Crop science Vol. 50; no. 1; pp. 281 - 291
• Main Authors: Saito, K, Azoma, K, Sié, M
• Format: Journal Article
• Language: English
• Published: Madison Crop Science Society of America 01.01.2010; American Society of Agronomy
• Subjects: Agricultural production; Agronomy. Soil science and plant productions; Biological and medical sciences; Crop science; dry matter accumulation; fertilizer rates; Freshwater; Fundamental and applied biological sciences. Psychology; Generalities. Genetics. Plant material; Genetic resources, diversity; genetic variation; Genetics and breeding of economic plants; genotype; Genotype & phenotype; grain yield; inflorescences; nitrogen; NPK fertilizers; Oryza sativa; phosphorus; plant adaptation; plant available water; Plant material; potassium; Rice; wet season; wide hybridization; Benin; West Africa; Sub-Saharan Africa; Africa; Asia; Oryza sativa; Monocotyledones; Grains; Gramineae; Tropical zone; Angiospermae; Genotype; Spermatophyta; Yield; Lowland; Cereal crop
• ISSN: 0011-183X; 1435-0653
• DOI: 10.2135/cropsci2009.05.0245

Six lowland experiments were conducted over three years in southern Benin to assess yield differences in 28 rice (Oryza spp.) genotypes grown under nonfertilized and fertilized conditions. These included the interspecific hybrids, the lowland New Rice for Africa (NERICA) genotypes developed from crossing O. sativa and O. glaberrima. Fertilizer rates were 70–86N: 30–37P2O5: 30–37K2O kg ha–1. Fertilizer application increased average grain yield across all genotypes and experiments by 39% (154 g m–2 increase). Considerable genotypic differences existed in grain yields under both nonfertilized and fertilized conditions, and in yield response to fertilizer application. Two lowland NERICA genotypes (‘NERICA-L-6’ and ‘-54’) outyielded ‘IR 72’ and ‘WITA4’ (standard checks) across nonfertilized and fertilized conditions in four experiments with favorable water availability in wet seasons (651 vs. 575 g m–2). The high grain yields resulted from large spikelet number m–2 and biomass accumulation. In contrast, three indica genotypes from Asia (‘B 6144F-MR-6-0-0’, ‘IR 70181-32-PMI-1-1-5-1’, and ‘PSBRc 80’) outperformed the checks in two experiments, one straddling wet and dry seasons and the other with no standing water during most of the usual wet rice-growing season. These results indicate that while specific adaptations are likely to provide significant yield advantage in particular environments, interspecific breeding still offers an effective approach to improving lowland rice productivity.