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Articles by Shad K. Khalil
Total Records ( 3 ) for Shad K. Khalil
  Amir Zaman Khan , P. Shah , Shad K. Khalil and F. H. Taj
  Determinate and indeterminate soybean types [Glycine max (L) Merrill] have different growth habits. One determinate (Epps, MG V) and one indeterminate (Williams 82, MG 111) cultivars were planted from May to August at one month interval using plant densities of 20, 40 and 60 plants m-2 to determine the growth behavior of cultivars. Number of days to emergence, unifoliate and 6th trifoliate leaf formation were reduced in both cultivars with delay in sowing. Early planted crop in May attained more plant height than delayed planted crop. Highest plant density of 60 plants m-2 attained maximum plant height as compared with the lowest plant densities. Epps produced the tallest plants as compared with Williams 82. The number of days to maturity declined with each successive planting date for both cultivars. The maturity date of Williams 82 was affected more by planting date than that of Epps.
  Shad K. Khalil , John G. Mexal and Leigh W. Murray
  Seed priming have been used successfully in an attempt to improve germination and seedling establishment of many vegetables and field crops. The objective of this research was to study the effect of polyethylene glycol (PEG) 8000 concentrations and seed treatment durations on soybean seed germination. Three experiments were conducted: In experiment 1, the seeds were treated for 1, 2, or 7 days. The osmotic potentials of the PEG solutions were 0, -0.1, -0.2, -0.4, -0.5, -0.7, and -1.1 MPa including control. In control the seeds were treated with water for the above duration. In experiment 2, the seeds were treated for 24, 48 or 72 hours The osmotic potentials of the PEG solutions was 0, -0.3, -0.5, -0.9 and -1.5 MPa including control. The control was not treated with water or PEG. In experiment 3, the seeds were separated into small and large seed and was treated with PEG solution having osmotic potentials of -0.5, -1.1 and -1.8 MPa for 0 (control), 24, and 48 hours. The control was not treated with water or PEG. PEG solution having osmotic potentials (-1.1 and -1.8 MPa) improved germination compared to control (no PEG treatment). Seed treatment durations longer than 48 hours was deleterious and reduced the germination. Seed size has no effect on germination.
  Shad K. Khalil , John G. Mexal and Leigh W. Murray
  Production of quality seed is one of the major problem in soybean (Glycine max. (L) Mell.,) in tropical countries including Pakistan. Seed quality in soybean, as determined by germination, seed weight and infection by seed pathogens is affected by date of maturity. The objective of this research was to evaluate the quality of soybean seed matured at different temperature. Soybean was planted on January 13, January 16, February 19, March 1, July 10, July 20, July 26 and August 25, 1991 at Agricultural Research Institute, Tarnab, Peshawar, Pakistan. Seeds planted in January, February, and March matured during hot weather conditions (June, July), produced heavier seeds, but had lower germination, and higher infection with seed borne pathogens. Seed planted in July and August reached maturity after hot weather conditions in October and November had ended and exhibited higher germination, little infection with seed borne pathogen, but produced smaller seeds. Seed size was inversely related to germination. Conditions that favor production of large seeds also favor infection with seed borne pathogens and lower germination.
 
 
 
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