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Articles by Baitullah
Total Records ( 4 ) for Baitullah
  Juma Khan , Shafiullah and Baitullah
  The diallel analysis of variance indicated highly significant differences among the genotypes for all the characters except number of ears per plant. The correlation studies on seven characters of 4 parents and 6 hybrids revealed highly significant genotypic positive association between yield and yield components, whereas the phenotypic association of yield components with yield was positive and significant except number of ears per plant, where it was positive but non-significant. Among the characters studied, the number of rows per ear reflected the highest direct contribution of 0.636 and indirect average contribution of 0.605 towards grain yield. Number of ears per plant and number of rows per ear expressed the highest positive coefficient of correlation of 1.409 and 1.018 with grain yield, respectively.
  Juma Khan , Shafiullah and Baitullah
  Combining ability effects were estimated for maize (Zea mays L.) grain yield and six related agronomic traits in 4 x 4 diallel analysis. Mean squares due to genotypes and specific combining ability effects for all traits except number of ears per plant were highly significant. Mean squares due to general combining ability effects were highly significant for ear height and number of grain rows per ear and significant for plant height and 100-grain weight, while these were non-significant for number of ears per plant, number of grains per row and grain yield per hectare. Variances due to specific combining ability were greater and more important for all characters except number of rows per ear. It indicated the presence of non-additive type of gene action. The inbred line USSR-3135 proved to be the best general combiner for number of rows per ear (0.352), number of grains per row (0.537) and grain yield per unit area (0.343), whereas the inbred line IMAN-I was good general combiner for plant height (0.055), inbred line A-637 was good general combiner for ear height and the inbred line ASE-304 was good combiner for 100-grain weight. A cross USSR-3135 x A-637 showed the best specific combining ability effect (3.253) for grain yield.
  Shafiullah , S. Asad , M.A. Rana , Baitullah , A.S. Khan and M.A. Malik
  Four row directions i.e., north-south (NS), east-west (EW), north east-south west (NESW) and north west-south east (NWSE) had very little effect on seed yield and other agronomic characters of sunflower. The differences in mean plant height, head diameter, seed yield, 100-achene weight and fatty acid profile were statistically non-significant. Similar trend was observed during both the single years. As an average of two years, although statistically non-significant, the highest seed yield of 3065 kg ha–1 from north east-south west (NESW) and the lowest yield of 2624 kg/ha were obtained from east-west (EW) row directions. The most pronounced effect of row directions was noted on the seed moisture content. As an average of two years, the maximum seed moisture content (21.4%) at harvest was obtained from east-west (EW) and the minimum (14.6%) from north-south (NS) row directions. NESW row direction also gave significantly lower moisture content (15.1%) than EW (21.4%) and NWSE (18.1%) row directions. Therefore, using north-south and NESW row directions would help to dry standing crop more quickly before harvest and reduce post harvest costs and losses. Seed production fields that require examination of sunflower heads to detect pollen production should be planted in NS rows for efficient rouging to keep genetic purity. For research plots, EW rows with plot labels on the east end often are preferred, because it is easier to evaluate most plots when all heads face the viewer.
  Shafiullah , M.A. Khan , M.A. Poswal , M.A. Rana and Baitullah
  The removal of upper 2/3 and ½ leaves caused a yield reduction of 29 and 55.8 percent in 1992 and 37 and 44.8 percent in 1993, respectively. During 1992, about 1 percent yield decline was observed when the lower 1/3 leaves were removed and 6 percent yield declined with the removal of the lower ½ leaves, while in 1993, the yield reduction was 26.7 and 39.2 percent due to removal of lower 1/3 and ½ leaves, respectively. This indicated that upper leaves (source) contribute more towards sink (seed yield) as compared to the lower ones. Correspondingly, the results indicated that insects and pests feeding on the upper portion of the sunflower plant can cause more reduction in seed yield than the lower leaves.
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