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Articles by R. Khan
Total Records ( 5 ) for R. Khan
  Amir Zaman Khan , H. Khan , R. Khan , Adel Ghoneim and Azza Ebid
  The aim of present study were to characterize the pattern of seed development in precociously mature soybean seeds planted on different dates during its progression from germination to seedling growth and maturation and its effect on yield under temperate environment. Changes in seed quality (Viability and Germination) were monitored from developmental to maturation (growth stage R5 to R7) of soybean (Glycine max (L.) Merr.) in different planting dates. Information on the effect of planting date on seed fresh and dry weight, moisture content and germination of soybean is meager. A field experiment was conducted with four planting dates and two soybean cultivars to study the influence of planting dates on seed developmental traits for 2 years. Determinate cultivars (Epps, maturity group [MG] V) and indeterminate cultivar, Williams 82 [MG] 111) were planted on May 1st to August 1st at one month interval at the Agriculture Research Farm of the NWFP Agricultural University Peshawar, during 2000 and 2001. Seeds were harvested at 10-days interval from 35 to 75 days after anthesis (DAA) in all planting dates. Epps planted in early May gave maximum fresh, dry seed weight and moisture content. A steady decrease in fresh and dry weight and moisture content were observed with delay in sowing of soybean. An inverse relationship was noted in Williams 82 regarding fresh, dry weight and moisture content in all planting dates. Water per seed increased up to 100% DAA, after which no further increase occurred. Moisture content declined for the whole seed, respectively, from above 75 and 65% at 95 DAA to 65 and 50% at 140 DAA in both cultivars. Decrease in seed moisture content during development was accompanied by increase in desiccation tolerance and germination, reaching maximum at physiological maturity in both cultivars. Fresh and dry seed germination increased linearly in both varieties. Mean rate of change in germination was more pronounce in Epps as compared to Williams 82. Immature seeds in both cultivars during early developmental stage did not germinate in all planting dates.
  R. Srivastava , R. Khan , S.A. Nasim , N. Manzoor and Mahmooduzzafar
  Glycine max L. (Soybean) is known for having its medicinal and nutritional value. It has capacity to accumulate high concentrations of cadmium (Cd). Studies were carried out to evaluate secondary metabolites production and biochemical potential of plant exposed to Cd-rich growing medium. Cd treatment in the form of Cadmium chloride (CdCl2) at supply of 0.25, 0.50, 1.00 and 2 mg L-1 increased the amino acid, protein, proline and diadzene content in field grown soybean plants at different developmental stages of Glycine max L. The enhancement was significant at Cd treatment of 1 mg L-1. The activity of antioxidant enzymes viz., superoxide dismutase (SOD), catalase (CAT) and Glutathione Reductase (GR) increased with increase in treatment of Cd in all developmental stages of soybean but increase in enzyme activity was more significant at Cd treatment of 2 mg L-1. Present finding suggested that higher diadzene production in cd enriched soyabeen contributed to higher medicinal value.
  H. Khan , A.Z. Khan , R. Khan , N. Matsue and T. Henmi
  The objective of the present study was to quantify the effects of zeolite application and allophanic soil (KyP and KnP) on leaf area development, plant height and reproductive morphology of soybean. One determinate (Enrei [MG] 1V) and indeterminate cultivar (Harosoy [MG] 11) were planted in pots on April 20th at the Faculty of Agriculture, Ehime University, Matsuyama Japan during 2007. Zeolite levels of 0, 1 and 2 wt.% were used to determine the growth behavior of soybean cultivars grown on two allophanic (KyP and KnP) and a paddy soil. Zeolite application and allophanic soil significantly affected leaf area development, plant height and reproductive morphology of soybean cultivars. Maximum leaf area and plant height were obtained from 2 wt.% zeolite application and allophanic soil (KyP and KnP). Minimum number of days to flowering, pod formation, seed filling duration and physiological maturity were taken by 1 and 2 wt.% zeolite application in both cultivars. The same trend was observed in number of days to reproductive development by KyP and KnP allophanic soil. Enrei took maximum days to all reproductive stages as compared to Harosoy. Zeolite treated plots and allophanic soil (KyP and KnP) attained more plant height than control plots grown on paddy soil without zeolite application. Harosoy produced the tallest plants than Enrei. Present findings supported the results of experiments by demonstrating that zeolite application at planting time promotes leaf area, plant height and encourage the reproductive morphology of soybean cultivars grown on KyP and KnP allophanic soil.
  M. Tariq , M. Sharif , Z. Shah and R. Khan
  An experiment was designed to study the effect of foliar application of micronutrients on the yield, quality and leaf composition of sweet orange, Blood red variety at Shabazgari, Mardan. The experiment was laid out in a randomized complete block design in 23 factorial arrangement. Zinc, manganese and boron were applied as foliar spray at the rate of 0.4, 0.2 and 0.04 kg ha-1, respectively in the presence of 1.56 kg N ha-1 as urea and 0.4 kg surfactance ha-1 (as wetting agent) in 400 L of water. The maximum fruit yield was obtained, when 0.4 kg Zn ha-1 and 0.2 kg Mn ha-1 was sprayed along with 1.56 kg N ha-1 and 0.4 kg surfactance ha-1 in 400 L of water. The minimum % peel was obtained with B alone and minimum % rag with Zn + Mn, maximum fruit size with Zn + B and maximum fruit volume with Zn + Mn. Similarly, % juice in sweet oranges was increased significantly by B alone, reducing sugar by Mn alone and vitamin C contents by Zn + B through foliar spray, suggested that each micronutrient had different role on the quality of citrus fruit. Foliar spray of Zn, Mn and B along with urea significantly increased the concentration of Zn and Mn in citrus leaves, while the concentration of B was not affected with foliar spray, perhaps due to dilution within the citrus tissues. Therefore, it is suggested that either Zn+Mn or Zn+B may be applied as foliar spray in combination with urea and surfactance for getting the maximum yield and improved quality of citrus fruit under prevailing conditions.
  A. Khan , Y.I. Khattak and R. Khan
  The paper describes the possibility of extending the storage life of onions by gamma radiation, which poses a serious storage problem in the hot summer months in Pakistan. Bulbs were irradiated at a dose of 0.10 kGy and stored, alongwith unirradiated control, under ambient conditions for a period of 4 months. The weight loss varied between 15 and 23 after the storage period. It was found that losses through dehydration were less in the Desi than in the Red Variety. The rotting ranged from 6.5-9.4 percent in the irradiated onions and 12.4-12.8 percent in the unirradiated bulbs after 4 months storage. Quality evaluation tests revealed that the internal and external quality of the irradiated samples scored higher than the corresponding controls. The cost of onions irradiation was calculated to be Rs.290.00 per tonne.
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