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Articles by S.M. El-Darier
Total Records ( 2 ) for S.M. El-Darier
  S.M. El-Darier , R.S. Youssef and M. A. Hemada
  In study area the pH of the soil under cotton and tomato plants was increased by CaCO3 fall-out on the soil surface. The two species received the maximum deposition of CaCO3 dust (1.09 and 1.64 mg cm-2 of leaf surface area respectively) at plot I (lies directly on the road). This may explain why their growth was significantly retarded at this plot as compared with plot II and III (40 and 100 m respectively away from the road). Such reduction in plant growth had resulted in a significant decrease in fruit yield, which amounted to 54, and 25% respectively relative to plot III. Chlorophyll `a` increased in both plants with the increase in CaCO3 dust whereas chlorophyll `b` decreased and the increase in the first exceeded the decrease in the latter causing an increase in chl a/b ratio.The percentage increase in N (62%) and K (31%) in cotton and P (79%) and K (150%) in tomato was higher in the vicinity of the road (plot I). The other elements (P, Na, Ca and Mg in cotton; N, Na, Ca and Mg in tomato) showed tendency to decrease with the increase in CaCO3 dust. In this context, the low concentration of Na and high concentration of K in the two species at the same plot has lead to a decrease in Na/K ratio. Currently, the low Ca2+ content in two species in the vicinity of the road indicate that these plants may bind Ca2+ taken in water insoluble form and can maintain themselves to some extent in CaCO3 polluted environment. Mg followed the same trend as that of Ca2+.
  S.M. El-Darier
  The allelopathic effects of Eucalyptus leaf-litter water extract (ELWE) and crude leaf-litter powder (ECLP) were studied on growth activities, nutrient uptake and the rate of metabolite accumulation of broad bean (Vicia faba L.) and Maize (Zea mays L.). The results showed that the germination of two species (maize >broad been) was enhanced at a level of 1% ELWE and greatly reduced (broad bean > maize) at 5% level. The shoot and root lengths, total dry weight and relative growth rate (RGR) (shoot > root) were greatly reduced in broad bean than in maize. Similarly, the leaf area index (LAI) was significantly (p < 0.05) reduced in the two species. The allelopathic compounds released from ECLP significantly (p < 0.01) suppressed the uptake of N, P and K in the two examined species. Such reduction was not correlated to the concentration of nutrients in plant tissues but highly positively correlated (p < 0.01) with the reduction that occurred in dry matter production. The two species exhibit a tendency to accumulate amino acids; proline and sugars, which may be considered as an adaptive mechanism to increase the stress tolerance. The study indicates a firm conclusion for the possibility of Eucalyptus phenolic and terpenoid compounds phytotoxicity for the two examined species.
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