抄録
To determine the yield stability and effects of environment on wheat grain yield through AMMI model, eight spring wheat varieties were evaluated under eight different sowing dates during rabi season over three consecutive years 2006-07, 2007-08 and 2008-09, respectively, at Regional Agricultural Research Station, Ishurdi, Pabna using a split plot design with three replications. The AMMI analysis of variance showed highly significant (P<0.01) differences for the main and interaction effect for the trait studied, indicating differential response of genotypes across testing environments. The AMMI model supplied an adequate fit to the data as first Interaction Principal Component Axis was significant (P<0.01). The first two bilinear terms accounted for 80.31% of the G × E sum of squares. The study revealed that 29-Nov. is the most optimum time for the cultivation of spring wheat in the tested region but it can be cultivated from 15-Nov. to 6-Dec. with good average yield. The biplot shows that Prodip is considered the best variety in terms of adaptation to all environments with high mean yield as it exhibited almost negligible interaction with environments and therefore could be recommended for the general cultivation in the tested region. Although Sufi was moderately sensitive to environments, it gave vary low yield among all varieties. BAW1064 was regarded as sensitive to environmental changes with the highest mean yield and might be recommended for cultivation under the favorable environments. Rest of the varieties showed sensitivity to environments with below mean yield and therefore could be recommended for late sowing.
