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Articles by P. Khan
Total Records ( 3 ) for P. Khan
  M. Imtiaz , B.J. Alloway , K.H. Shah , S.H. Siddiqui , M.Y. Memon , M. Aslam and P. Khan
  The antagonistic effect of Zn and other micronutrients was studied in sand culture using Long Aston nutrient solution. Five levels of Zn were employed to wheat plant along with other essential plant nutrients. It was observed that Zn application had adverse effect on Fe concentration and Fe uptake in plant. Zinc deficient plants had significantly higher concentration of Fe. The results indicated that as the Zn concentration in the substrate was increased, the Fe concentrations in plants were decreased. Zinc also antagonised the uptake of Mn and Cu in the plants. Zinc had such a pronounced adverse effect on Cu concentration that its concentration dropped to deficiency level (3 μg ml-1). The roots always showed higher concentrations of these elements than shoots. The higher concentrations of trace elements were observed during first growth stage as compared with second growth stage.
  M. Imtiaz , B.J. Alloway , K.H. Shah , S.H. Siddiqui , M.Y. Memon , M. Aslam and P. Khan
  The effects of Zn on growth and growth components of wheat were studied in sand culture using hydroponics solution. Five Zn treatments were given to wheat along with other essential nutrients. The plants were stunted in the control pots and weaker than the plants treated with Zn due to Zn deficiency. The growth of plants, supplied 20 μg Zn ml-1 was also lower than the other Zn-treated plants. Well-defined Zn deficiency symptoms were not observed in wheat plants however copper deficiency symptoms were obvious when Zn was applied at the higher rate for a longer time. Dry matter of wheat increased by increasing rates of Zn up to 15 μg ml-1. Above these optimum rates, the higher rates of Zn application depressed the dry weight of crop. The plants from the control pots had lower Zn concentrations, which ranged between 15-16 μg g-1. The data also revealed that Zn concentration in the second growth stage (S2) was lower compared to the first growth stage (S1) and the uptake of Zn by the plants was higher as dry matter yield was higher for stage S2.
  M.H. Chandio , N.T. Narejo , S. Jalbani and P. Khan
  Breeding biology was elucidated in terms of ova diameter, gonadosomatic index (GSI %) and fecundity of Notopterus notopterus from Keenjhar Lake, district Thatta, Sindh, Pakistan during May to September 2014. It was observed that the size of ova starts increasing from 1.0-2.82 mm during the study period and found highest (2.82) in July. The GSI % values were also found to increase from 0.1 to 1.83 and 3.72 to 7.92 for male and female, respectively. The estimation of fecundity in the present course of investigation was based on 12 graved fish. The fecundity of N. notopterus was ranged from 105-1500 eggs. The highest (1500 eggs) was recorded from the fish of 30.5 cm and 313.8 g and lowest (105 eggs) was recorded from the fish of 18.5 cm and 66.5 g in length and weight, respectively. It was concluded that the experimental fish N. notopterous was found to be low fecund fish as compare to carps due to bigger size of eggs and single lobed ovary. Fecundity was plotted against different body parameters like total length, body weight and gonad weight and found that it bears strong relationship with the total length.
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