Asian Science Citation Index is committed to provide an authoritative, trusted and significant information by the coverage of the most important and influential journals to meet the needs of the global scientific community.  
ASCI Database
308-Lasani Town,
Sargodha Road,
Faisalabad, Pakistan
Fax: +92-41-8815544
Contact Via Web
Suggest a Journal
Articles by Hamayoon Khan
Total Records ( 4 ) for Hamayoon Khan
  Amir Zaman Khan , Hamayoon Khan , Rozina Khan and Abdul Aziz
  The objective of the present study was to examine the relationship between various seed quality tests and field emergence of the new and old wheat cultivars. Laboratory and field tests were conducted during 2003 and 2004 in NWFP Agricultural University Peshawar, Pakistan, to investigate the suitability of various Laboratory vigor tests, to rank quality of commercial seed lots and to predict seedling Field Emergence (FE) of thirty-two samples of four wheat varieties. Seeds of four wheat cultivars Takbeer 2000, Haider 2000, Bakhtawar-92 and Fakhri Sarhad were produced in eight different location of NWFP-Pakistan during 2003 and 2004. Mature seeds were harvested, threshed and cleaned before determining standard germination and other vigor tests. Results showed that among all tests, Germination Index (GI), Accelerated Aging (AA) and Electrical Conductivity (EC) provided the best estimate of seed vigor for the four wheat cultivars, both for ranking seed lots quality and predicting field emergence. The GI, AA and EC tests better indicated seed lot quality and predicted FE than SG of the four cultivars over the 2 years followed by Radical Length (RL). The Electrical Conductivity (EC) result was not only poorly related to FE, but also poorly related to the Standard Germination (SG) of a wide range of seed lots of the four varieties that varied in viability. Initial count of Standard Germination (SGi) generally performed more poorly than the other vigor tests. From this study and previous work on wheat crop, we conclude that GI, AA and EC test for wheat crop have the potential to be developed as improved vigor tests for ranking seed lot quality and predicting seeding performance under temperate regions of the world.
  Hamayoon Khan , Amir Zaman Khan , Rozina Khan , Naoto Matsue and Teruo Henmi
  The objective of this study was to quantify the effects of Zeolite and Allophane on vegetative phenology of determinate and inderminate 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, 20 and 40 g were used to determine the growth behavior of soybean cultivars grown on KyP and KnP of allophanic soil. Zeolite and allophanic soil application significantly affected vegetative phenological parameters of soybean cultivars. Minimum number of days to emergence, unifoliate first and second and 6th trifoliate leaf formation were taken by 20 and 40 g Zeolite application in both cultivars. KyP and KnP of allophanic soil took minimum days to all vegetative phonological parameters. Enrei cultivar took minimum days to emergence and in all respective vegetative developmental periods than Harosoy. Zeolite treated plots attained more plant height than control plots. Both KyP and KnP of allophanic soil gave maximum plant height as compared to paddy soil. Harosoy produced the tallest plants than Enrei. Present findings support the results of experiments by demonstrating that Zeolite application at planting time encourages the initiation of vegetative phenology of soybean cultivars grown on KyP and KnP of allophanic Soil.
  Hamayoon Khan , Naoto Matsue and Teruo Henmi
  Water adsorption is one of the important physicochemical properties of clays and nano-ball allophane has extremely high water adsorption capacity due to its high specific surface. The water vapor adsorption on two nano-ball allophane samples with low and high Si/Al ratios (0.67: KyP; 0.99: KnP), under various Relative Humidities (RHs), generally decreased with dry grinding treatment. For KyP sample, water vapor adsorption at monolayer level on the nano-ball (RH≤0.45) decreased by 2 h grinding, but capillary water condensation between the nano-ball (RH≥0.6) was not affected. The little effect of the grinding on the capillary water condensation means no change in water vapor accessibility of outer surface in the hollow spherical allophane structure. On the other hand, decrease in water vapor adsorption at monolayer level indicates decrease in water vapor accessibility of the rest of total surface, i.e., pore region and inner surface of the hollow sphere. In case of KnP sample with higher Si/Al ratio, water vapor adsorption at monolayer level showed little change with the grinding, but capillary water condensation decreased. These results indicates that, with the grinding, allophane nano-balls in the KnP sample became more closer each other, but small space is still remained allowing monolayer water adsorption on the outer surface, pore region and inner surface. The small space remained is presumed to be due to accessorily attached silicate tails projected outward of the nano-ball, which prevented direct contact between nano-balls. The nano-ball in the KyP sample with few tails tended to contact directly even before the grinding and the grinding might caused connection between nano-balls via pore region which decreased water vapor accessibility to pore region and inner surface.
  Amir Zaman Khan , Hamayoon Khan and Rozina Khan
  The objective of this study was to quantify the effects of canopy temperature on physio-chemical quality of soybean planted on different dates. An experiment was conducted at the Agriculture Research Farm of the NWFP Agricultural University, Peshawar, during 2000 and 2001. 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 during both years. Data was recorded on canopy temperature and physio-chemical attributes of soybean. Heat indices were calculated from canopy maximum and minimum temperatures for the periods between growth stages starting from beginning of bloom to physiological Maturity (R3-R7). Physio-chemical attributes were regressed on different heat indices. Canopy temperature during reproductive growth stages of R4-R5, R5-R6 and R6-R7 had pronounced effect on physio-chemical quality of soybean. Increase in mean averaged temperature in the range of 23-30°C during growth stage of R6-R7 improved germination, field emergence and increase seedling dry weight, protein and oil contents of soybean seed. Whereas, increase in mean temperature averaged in the range of 23 to 30°C during reproductive growth stage of seed beginning to full-seed (R5-R6) reduced germination, field emergence, electrical conductivity, protein and oil contents of soybean seed. Increase in maximum temperature in the range of 32 to 37°C during growth stage of full bloom to seed initiation (R4-R5) decreased seedling dry weight and oil content of soybean seed.
Copyright   |   Desclaimer   |    Privacy Policy   |   Browsers   |   Accessibility