A. N. Md. Sajedul Karim
Scientific Officer
RARS, hathazari, Ctg.
M. Z. A. Talukdar
SO
Plant Breeding Division
BARI, Gazipur
Six commercial hybrids and three BARI released maize hybrids along with one check Pacific60 were assessed for genotype environment interaction (GEI) and stability specially for selection of the best BARI released hybrid maize variety for the farmer of Chittagong region during rabi 2011-12. For this assessment five locations at Chittagong region including hill were selected. The AMMI (additive main effects and multiplicative interaction) model was used to analyze the genotype-environment interaction over five locations in select the hybrid having higher yield and other potential attributes. For genotypes (G), significant variation was found in all the characters but variation for environment (E) was significant only for days to tasseling, silking and maturity. The environment Fatickchori and Satkania were poor, Hathazari, Ramgarh and Ramu were positive environments for tested maize hybrids. Considering the mean, bi and S2di three parameters, it was evident that all the genotypes showed different response of adaptability under different environmental conditions. Among the hybrids, Ajanta showed the highest yield but it is suitable for specific locations. Hybrid BHM 9 and C1921 were higher yielding as well as stable over all environments. Asha 3501, 999 and BHM 7 were highly stable with moderate yield potentially.
Maize, genotype, environment, ammi model.
RARS, Harhazari, Chittagong
Variety and Species
The objective of this study was to use the AMMI analysis model to assess the stability of 10 maize hybrids and verify the influence of a sample of environments at Chittagong Hill Tracts in South parts of Bangladesh (Hathazari, Satkania, Ramu, Fatickchari and Ramgarh) in the productive performance of these hybrids.
The experiment was conducted at five locations of Chittagong namely Hathazari, Satkania, Ramu, Fatickchari and Ramgarh during rabi 2011-12. Seven commercial hybrids and three BARI released maize hybrids were evaluated at this study. Experimental seeds were sown at Hathazari on 13 December, Satkania on 16 December, Ramu on 14 December, Fatickchari on 22 December and Ramgarh on 24 December, 2011. The experiment was laid out in Randomized Complete Block Design with 3 replications. Seeds of each entry were sown in 2 rows, 5m long plots with 75cm and 20 cm spacing between rows and plants, respectively. One healthy seedling per hill was kept after thinning. Fertilizers were applied @ 250, 120, 120 40 and 5 kg/ha of N, P2O5, K2O, S and Zn, respectively. Standard agronomic practices were followed (Quayyum, 1993) and plant protection measures were taken as required. Two border rows were used for minimize the border effect. Data on days to tasseling, days to silking was recorded on whole plot basis. Ten randomly selected plants were used for recording observations on plant and ear height. All the plants were considered for plot yield. The grain yield (t ha-1) data was assessed and corrected to 12% moisture.
Considering the yield potentially and stability parameters, Hybrid BHM 9 and C1921 were higher yielding as well as stable over all environments. Asha 3501, 999 and BHM 7 were highly stable with moderate yield potentially. Ajanta the highest yielder and it was suitable for specific locations.
Journal