Grain yield performance and stability analysis of rice varieties under rainfed lowland conditions of Western Visayas, Philippines

摘要

The use of adaptable and high-yielding varieties is one of the key factors in achieving rice sufficiency in the country. To identify the suitable rice varieties for the rainfed lowland ecosystems of Western Visayas, Philippines, a variety trial was conducted in the six provinces in the region. Thirty rice varieties comprised of new and old varieties released by the National Seed Industry Council (NSIC) intended for different rice ecosystems were tested in the six provinces of Western Visayas. Grain yield data were analyzed using combined analysis of variance (ANOVA) to determine the effects of factors such variety (V), location (L), and location x variety (L x V) which is basically genotype by environment interaction effect. To further understand the effect of G x E interaction, GGE biplot analysis which graphically presented the GE interaction and AMMI analysis was done. GGE biplot analysis generated data that identified the presence of mega-environments and the best performing varieties across locations and within location. Yield stability of different rice varieties across environments was evaluated using four stability parameters performed in accordance with Wricke's ecovalence (W-i(2)), Lin et al. (1988) cultivar superiority measure (Pi), Finlay and Wilkinson (1963) sensitivity analysis, and static stability measure coefficient (s(2)). Combine analysis of variance (SAS) and AMMI analysis determined the presence a large and significant GE interaction on the grain yield responses of rice genotypes tested on six environments. Among the varieties tested, NSIC Rc152 and PSB Rc14 were identified as the most stable varieties in terms of high grain yield by four stability parameters used. These varieties can be recommended to rainfed rice farmers of Western Visayas, Philippines to increase their rice production.