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Articles by Jehan Zeb
Total Records ( 2 ) for Jehan Zeb
  Jehan Zeb , Shahid Ahmad , M. Aslam and Taj Ali Khan
  A study was conducted at the WRRI-NARC, Islamabad under controlled conditions of rainfall and high temperatures to simulate hot-arid environment for establishment of plants like Eucalyptus camaldulensis and Acacia arabica in plastic bags with an objective to reduce volume of water required for establishment and to achieve higher survival rates. The results indicated that number of irrigations were reduced to half under bags of 20 x30 size compared to control and volume of water used, was reduced by 60-70 per cent. The irrigation interval was almost doubled in 20 x30 polyethylene bags compared to control. The volume of water per irrigation also reduced by 27-55 per cent, reducing the irrigation cost considerably. The peak daily reference crop evapotranspiration (ETr) of 9.41 mm/day was observed during June. Water requirement was reduced to about 1/4th of the ETr in plastic bags compared to about 3/4th of the ETr in control. The increase in water use efficiency for plastic bags was 4-5 times that of the control. Plastic bag of 20 x30 size resulted in 16 per cent increase in growth for Eucalyptus. The increase was around 59 per cent for Kikar under bag size of 18 x24 compared to control.
  Jehan Zeb , M.Aslam , Shahid Ahmad and Aamir Kabir
  In this study a low-cost sand filter was, developed at WRRI-NARC, linked with hand pump and tested for its performance. In the process 1 m3 of stock (Lawrancepur) sand was standardized in terms of water retention, pumpable water and sediment removal. 1 m3 of sand was found to hold 353 litres of sediment-free water, 82 percent of which (290 lit) was pumpable. The filter was found quite effective for the removal of sediments and removed 100 percent sediments from an influent sediment concentration of about 14 gm/lit. The filter provided 1282 litres of clean water in five runs and infiltration rate was reduced to 18 percent of the initial at the end. The technology was found cost-effective and appropriate for domestic and stockwater use of rural communities where the need for clean water is even more.
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