| Abstrakt: |
Determining the factors affecting the yield of corn varieties due to genotype by environment (G × E) interaction can be helpful in the identification of sites with contrasting environments for effective multi-location trials. Field experiments were conducted for one cropping season in selected corn-growing areas in the Philippines. Corn varieties used were: (i) IPB Var 6, IPB Var 8, LB Lagkitan, IES Lagkitan, and Native corn in Luzon; (ii) IPB Var 6, IPB Var 11, IPB Var 13, and OxL in Visayas; and (iii) IPB Var 6, LB Lagkitan, and OxL in Mindanao. Climatic parameters, such as temperature, rainfall, and relative humidity in each location were determined. Grain yield variability was obtained as affected by the prevailing climatic factors during the growing period. In Luzon, variations in corn grain yield were mainly attributed to the genotypic effect under Type I climate (distinct dry and wet season), and IPB Var 6 has consistently higher grain yields across sites. The effect of the environment on the grain yield of IPB Var 6, IPB Var 8, LB Lagkitan, IES Lagkitan, and Native variety was apparent under Type IV climate and the different corn varieties were not affected by the climatic factors. In the Visayas, relative humidity contributed significantly to grain yield variations of four varieties in different locations with Type I climate. Varietal differences in corn grain yield under Type IV climate were attributed to the genotypic effect and IPB Var 13 variety has consistently higher grain yield. Temperature, genotype, and relative humidity contributed significantly to the variations in the grain yield of IPB Var 6, OxL, and LB Lagkitan in locations with a Type II climate in Mindanao. On the other hand, genotype and relative humidity significantly influenced the yield performance of three varieties grown in different locations with a Type IV climate. In conclusion: (i) IPB Var 6 can be recommended in Luzon under Type I and IV climates, based on yield performance across locations; (ii) IPB Var 13 can be recommended under Type I and IV climates in the Visayas based on grain yield, with IPB Var 11 being the most stable genotype across three locations with Type I and IV climates; and (iii) IPB Var 6 having the highest grain yield under Type II and IV climates in Mindanao, can be recommended in Mindanao, eventhough it has specific adaptations in some locations. [ABSTRACT FROM AUTHOR] |
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