Search Results

You are looking at 1 - 4 of 4 items for :

  • "location effect" x
  • Refine by Access: All Content x
Clear All

Durum wheat is a good source of protein. A grain protein content of 13% for durum is a standard in quality throughout the grain industry (Riley et al. 1998). Protein content like other traits in wheat is known to be affected by genetic and environmental factors mainly location (Bement et al. 2003). In this study we evaluated a set of 25 genotypes comprising introduction from CIMMYT and advanced lines developed through hybridization by the Ethiopian National Durum Wheat Research Project (NDWP) for protein content over six testing locations, representing the wheat agro-ecologies in the country. The experiments were conducted in a randomised complete block design (RBD) with three replications each. Plot size was kept at 2 m 2 . Grain protein content was analyzed following Kjeldahl method (A.A.C.C. 1983). Stability analysis was done according to Eberhart and Russel (1966) model and effect of locations and its interaction with genotypes were estimated following additive main effects and multiplicative interaction (AMMI) model. The mean grain protein content varied from 11.61 to 13.52% among the genotypes. Only three genotypes, namely CD98206, DZ3117 and DZ-04-118 attained higher grain protein content than standard 13.00%. Stability analysis revealed that all but three genotypes were observed to be predictable. DZ 2212-1BS was found suitable for favorable environments. Genotype CD97383 was found sensitive to change in environment. Eight genotypes were identified as stable. Genotypes DZ3117 was found to be the best having maximum protein content recorded at AlemTena location and higher yield with stable performance across locations. AMMI analysis revealed that the first two significant IPCA scores together explained 73.55% of the total interaction variance. Biplot graphical analysis showed Alem Tena as the best location followed by Debre Zeit and Minjar in terms of average protein content of genotypes. Genotype DZ1669-1AK scored zero and could be considered as stable and wide adaptable having protein content higher than the general mean. The graphical analysis of IPCA 1 and IPCA 2 further revealed that this genotype was relatively close to origin zero. Genotype DZ-04-118 was adapted to Debre Zeit and Minjar while a large numbers of genotypes with negative IPCA score were adapted to Akaki and Chefe Donsa locations. Genotype DZ3117 had specific adaptability to Alem Tena location. High protein but low grain yield at Alem Tena may be due to the drought occurrence during grain filling period.

Restricted access

The adaptability of twelve single cross maize hybrids was investigated at five different locations in Hungary over a three-year period. The characters examined were individual plant production (total mass of the ears on a single plant), thousand kernel mass, number of kernel rows, ear length, number of kernels per row, shelling % and the assimilating leaf area above the main ear.Among these yield components, the individual plant production, the ear length, the number of kernels per row and the grain-cob ratio (shelling %) were influenced to the greatest extent by the year, followed by the variety and the location. The greatest average yield was achieved by the tested hybrids at all five locations in 1997 (263 g/plant). The average yields in 1998 and 1999 were significantly lower (221 and 203 g/plant, respectively). The outstanding yields achieved in 1997 could be attributed to the favourable ecological conditions, which led to the development of secondary ears in Keszthely and Sopronhorpács. At the other three locations there was only one ear per plant, but these ears were longer than in the following years. The greatest year effect was recorded in Sopronhorpács, where the individual plant production amounted to 305 g/plant in 1997 and 238 g/plant in the worst year, 1999. In Gyöngyös conditions were very dry in all three years, so the year effect was least pronounced at this location (grand mean of 195 g/plant in 1997 and 201 g/plant in 1999). Stability analysis was carried out using the coefficient of variance for individual plant production. Hybrids Mv 3, Mv 5, Mv 9 and Mv 12 were found to have the best adaptability. The shelling % was not significantly influenced by the location; the grain-cob ratio is relatively stable for maize hybrids. A correlation was found between the individual plant production and the leaf area above the main ear (R 2 =0.66). Hybrids with the largest leaf area above the main ear also had the greatest ear mass.

Restricted access

Some agronomical characters of twelve single-cross maize hybrids were investigated at five different locations in Hungary over a three-year period. The characters examined were individual plant production (total mass of the ears on a single plant), thousand-kernel mass, number of kernel rows, ear length, number of kernels per row, shelling % and the assimilating leaf area above the main ear. Among these yield components, the individual plant production, the ear length, the number of kernels per row and the grain-cob ratio (shelling %) were influenced to the greatest extent by the year, followed by the variety and the location. The greatest average yield was achieved by the tested hybrids at all five locations in 1997 (263 g/plant). The average yields in 1998 and 1999 were significantly lower (221 and 203 g/plant, respectively). The outstanding yields achieved in 1997 could be attributed to the favourable ecological conditions, which led to the development of secondary ears in Keszthely and Sopronhorpács. At the other three locations there was only one ear per plant, but these ears were longer than in the following years. The greatest year effect was recorded in Sopronhorpács, where the individual plant production amounted to 305 g/plant in 1997 and 238 g/plant in the worst year, 1999. In Gyöngyös conditions were very dry in all three years, so the year effect was least pronounced at this location (grand mean of 195 g/plant in 1997 and 201 g/plant in 1999). Stability analysis was carried out using the coefficient of variance for individual plant production. Hybrids Mv 3, Mv 5, Mv 9 and Mv 12 were found to have the best adaptability. The shelling % was not significantly influenced by the location; the grain-cob ratio is relatively stable for maize hybrids. A correlation was found between the individual plant production and the leaf area above the main ear (R2=0.658). Hybrids with the largest leaf area above the main ear also had the greatest ear mass.

Restricted access

.4, p  < .01) at the same level than baseline (no significant differences between post second word and baseline: t  = 0.9, p  = .7). In addition, an expected main Location effect was present in both ANOVA for both frequency bands, with higher

Open access