Browsing Qatar University Science Journal - [From 1981 TO 2007] by Title
Now showing items 540-559 of 770
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Plant phenology and its relation to the cool semi-arid condition of Sana'a
( Qatar University , 1997 , Article)In the cool semi-arid highland areas of Sana'a a plant phenological study of forty two species revealed that there was one major outburst of plant emergence corresponding with the first period of the heavy rainfall which ... -
Plant Population Density Effects On Yield Of Sorghum Grown In A Dry-Land Farming System
( Qatar University , 1996 , Article)Plant population studies in arid regions are very sparse and not well documented. A prerequisite in growing a successful sorghum (Sorghum bicolor [L.] Moench) crop is to obtain an adequate plant population. The response ... -
Planting Date Effect On Growth Characters And Yield Of Sorghum Under A Dry Farming-System In An Arabian Gulf Environment
( Qatar University , 1996 , Article)Irrigated crop production in Qatar is a risky enterprise due to extreme weather conditions. Temperature is sufficiently warm to allow planting of grain sorghum [Sorghum bicolor (L.) Moench] from Aug through to Oct. Crops ... -
Pliocene Coralline Algae, South Of Safaga (Red Sea, Egypt)
( Qatar University , 1984 , Article)Coralline algae are highly abundant in the Pliocene succession of the area south of Safaga (Red Sea, Egypt). The articulated corallines (Corallinoideae) are represented here by a single genus, Amphiroa. The crustose coralline ... -
Point-Wise Summability Of Fourier Series And Its Related Series In The Norlund Sense
( Qatar University , 1985 , Article)In this note we consider the point-wise summability of Fourier series in the Norlund sense by extending a theorem of Lebesgue [ 6 ] . We also consider analogous theorems of our extension to derived Fourier series, and ... -
Pollen Morphology of some Cultivated Varieties of Strawberry
( Qatar University , 1999 , Article)Pollen grains of twelve cultivated varieties of strawberries grown in Egypt were morphologically studied using both light microscopy and SEM observations. These varieties include eleven cultivars of Fragaria x ananassa ... -
Pollen Morphology Of The Family Boraginaceae In Qatar
( Qatar University , 1995 , Article)The pollen morphology of six species belonging to six genera of Boraginaceae in Qatar have been investigated by LM and SEM. The examined species proved to be eurypalynous, having different morphological types and can be ... -
Population biology of sparid fishes in Qatari waters 2. Age, growth and mortality of black-banded bream, Mylio bifasciatus (forsskal)
( Qatar University , 1993 , Article)Age, growth and mortality of black-banded bream (faskar) Mylio bifasciatus from the Arabian Gulf waters off Qatar were estimated. The study was conducted on 314 fish obtained from the trawl catch of Qatar National Fishing ... -
Population biology of sparid fishes in qatari waters 3. Reproductive cycle and fecundity of black-banded Seabream, mylio bifasciatus (forsskal)
( Qatar University , 1994 , Article)The reproductive cycle, gonads maturation, gonado-somatic indices (GSI) and fecundity of black-banded seabream Mylio bifasciatus from the Arabian Gulf waters off Qatar were investigated. Bi-weekly samples representing all ... -
Population biology of sparid fishes in qatari waters : 4. Growth and mortality of longspine sea bream (argyrops spinifer)
( Qatar University , 1995 , Article)Age, growth and mortality of longspine scabrcam, Argyrops spinifer in the Arabian Gulf waters off Qatar were investigated. The study was conducted on 664 fish obtained from Qatar National Fishing Company. The results ... -
Population biology of sparid fishes in qatari waters. 1 - reproductive cycle and fecundity of longspine seabream, Argyrops spinifer (Forskal)
( Qatar University , 1993 , Article)The reproductive cycle, gonads maturation, gonado-somatic indices (GSI) and fecundity of longspine seabream Argyrops spinifer from the Arabian Gulf waters off Qatar were investigated. Bi-weekly samples representing all age ... -
Population Ecology of the Intertidal Sea Star Asterina Burtoni Gray (Asreroidea: Echinodermata) In the Wakrah Bay, South East Of Qatar
( Qatar University , 1995 , Article)The abundance, distribution and population age structure of the sea star Asterina burtoni Gray were investigated in the intertidal area of the Wakrah Bay, South East Qatar Peninsula from October, 1993 to January, 1994. The ... -
Population Structure And Growth Curve Of Acanthopleura Gemmata (Mollusca: Polyplacophora) In The Northwestern Red Sea
( Qatar University , 1996 , Article)Studies on Acanthopleura gemmata population were carried out in a site located on northwestern coast of the Red Sea called Sharm Elnagha, 40 km south of Hurghada city, Egypt (26° 56' N and 43° 00' E). In these studies, the ... -
The Possible Effects of Some Mineral Nutrients and Industrial Chemical Effuents on Wild Plants in Central Sudan
( Qatar University , 2006 , Article)The effects of some mineral nutrients and industrial chemical effluents from a textile factory and tanning activities on the growth and distribution of Typha angustata, Cyperus laevigatus. Paspalum viginatum, Cassia senna ... -
Possible Ionic Effects of NaCl on Two Mexican Wheat Cultivars
( Qatar University , 2005 , Article)The effect of NaCl on growth and physiology of two Mexican wheat (Triticum asestivum L) cultivars (Cajeme: salt tolerant, and Yecora: salt sensitive) was compared with that of other osmotic agents, Na2SOa (ionic compound) ... -
A practical Approach for water Use Efficiency in Arid Areas
( Qatar University , 1997 , Article)A practical approach for water use efficiency (WUE) relying on the actual amount of applied water was examined from both theoretical and practical stand points. Pearlmillet {Pennisetum americanum (L.) K. Schum), sorghum ... -
Prediction Intervals For Future Sample Mean From Inverse Gaussian Distribution
( Qatar University , 1991 , Article)A random sample Xi, Xz, ..., Xn from Inverse Gaussian distribution I(/x,X) is observed. On the basis of this observed sample a lOOp prediction interval of the mean Y of a future sample Yi, ..., Ym from I(^,^.) has been ... -
Preliminary Assessment of the Effect of Saline Water Used in Irrigation on the Growth of the Local Barley Cultivar (Harma)
( Qatar University , 2001 , Article)ABSTRACT The effect of gradual increase m soil salinity, using diluted solutions ofseawater, on growth and yield of the local barley cul-tivar (Harma) was examined. Harma barley did not withstand osmotic shock higher than ... -
A Preliminary Check-List Of Benthic Mollusca On The Qatari Coasts, Arabian Gulf
( Qatar University , 1994 , Article)In this paper, an annotated checklist of the benthic marine Mollusca collected from Qatari coasts, Arabian Gulf, is presented. Localities and habitats are given for the common families of the recorded groups. Gastropoda ... -
A Preliminary List Of The Insect Fauna Of Qatar
( Qatar University , 1985 , Article)The present paper give a preliminary account of the entomofauna of Qatar. It has a complex composition, the species are a heterogenous group with diverse distribution patterns. The account does not lay to completeness. ...