GGE and AMMI biplot for interpreting interaction of genotype X environments of cassava promising genotypes

Abstract

Before releasing a new variety, the promising cassava genotype should be tested in some environments. This test is a precondition for releasing a new variety. The purpose of the experiment is to fulfill the said precondition. The experiments were done in eight environments during 2010-2011 with an RCBD (Randomized Complete Block Design) and repeated for three times. The plants were planted with a distance of 100 cm between rows and 80 cm within row. The experiments were done by testing eight promising genotypes and released variety as checks. The dimension of the plot was 5 m x 4.8 m. The plants fertilized using 200-kilogram urea, 100 kilograms of Sp-36, and 100 kilograms of KCl per hectare. Data for starch production during seven months were taken and calculated by PBTools and IRRISTAT software. The result shows that PG-1 was a stable genotype using GGE and AMMI biplot. Across the eight environments, PG-1 had a high starch product for seven months, reaching 6.05 tons per hectare. This value is significantly higher (10%) than that of UJ3 (released variety). When the price of tapioca flour was US$ 445/ton, the increase in PG-1 starch production compared to UJ3 was almost the same as US$ 269/ha. PG-1 has been released by the Minister of Agriculture as a new variety in 2016 with the name UK 1 Agritan.