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Articles by Amir Zaman Khan
Total Records ( 8 ) for Amir Zaman 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.
  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.
  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.
  Amir Zaman Khan , M. Akhtar , R. Ahmad , N. Ahmad and P. Shah
  Protein and oil contents of soybean varieties were significantly affected by planting date and plant density. Late planted crop gave more protein content than early planted crop, while an inverse relationship was found for oil content. Lower plant density of 200 thousand plants ha -1 gave significantly more protein content than higher plant densities of 400 and 600 thousand plants ha -1 and the same response was observed for oil content but the difference among the plant densities did not reach the 5% significance level. Epps produced more protein and oil contents than William-82. There was no effect of plant density on Oil concentration in seeds of William -82, however Oil concentration in seeds of Epps decreased with increase in plant density, indicating differential response of Oil concentration in seeds of the two soybean varieties.
  Beena Saeed , Amir Zaman Khan and Hasina Gul
  Nitrogen and sulfur supplies have a strong influence on the physio-chemical characteristics of crop as well as on the quality and quantity of wheat storage proteins, which play an important role in bread-making process. In order to evaluate the contribution of soil and foliar fertilization of nitrogen and sulfur on quality assessment of wheat, a field trail was carried out having RCB design with four replications and eight different treatments of N and S combinations allotted to plots at different growth stages. Results indicated that highest gluten content (28.35%) was recorded when the wheat crop was fertilized with treatment number-6. Likewise minimum ash contents (1.83%) and minimum electrical conductivity was observed with fertilization of treatment number-8, while control practice result low gluten contents, low standard germination %age and minimum accelerated aging germination test value. In all the recorded observations concerning the experiment wheat cultivar Pirsabaq-2005 showed appreciable response as compared with other variety. So it is possible to obtain maximum quality assessment traits of wheat grain and flour through soil and foliar application of N and S.
  Hasina Gul , Amir Zaman Khan , Beena Saeed , Shaheen Nigar , Ahmad Said and Shad Khan Khalil
  A two years field study was conducted to determine seed quality tests of wheat varieties under the response of different sowing dates and nitrogen fertilization at New Developmental Farm of Khyber Pakhtunkhawa Agricultural University, Peshawer, Pakistan under agro-climatic condition of Peshawar valley during 2008-09 and 2009-10. The experiment was laid out according to randomized complete block design having split plot arrangements with four repeats. Four planting dates (24th October, 13th November, 3rd December and 23rd December) with 20 days intervals allocated to main plots whole 4 levels of nitrogen (0, 100, 130 and 160 kg N/ha) along with two varieties (Pirsabak 2005 and Khyber-87) were allotted to sub plots. Wheat crop responded differently to sowing dates and nitrogen fertilization for various characters. Highest standard germination, field emergence, accelerated aging germination test and seedling dry weight were recorded under 24th October sowing but lowest values were obtained under delay seeded condition. Similarly these seed quality attributes of Khyber-87 significantly affected by nitrogen application. Early (Oct. 24th) seeding date in combination with 130 kg N/ha accelerated seed quality attributes of Khyber-87 whereas late seeded condition declined these parameters even using maximum dose of nitrogen.
  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.
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