Browsing University Publications by Author "Ismail, A. M. A. [احمد محمد علي اسماعيل]"
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Age Environmental Factors, Germination And Seedling Emergence Of Ocimum Basilicum L
Ismail, A. M. A. [احمد محمد علي اسماعيل] ( Qatar University , 1990 , Article)Fresh and exhumed seeds of Ocimuni basilicum L. gave 100 % germination at 13/11-h alternating temperature of 20/10, 32/18, 38/24 and 40/32 °C but did not germinate at constant temperatures. Germination was prevented in the ... -
Apical dominance in vicia faba l.
Ismail, A. M. A. [احمد محمد علي اسماعيل] ( Qatar University , 1983 , Article)A side-effect of plant surgery was an interference with apical dominance. From the results of three experiments involving plant surgery, decapitation and the usage of "C-IAA, it appeared that the movement of the apically ... -
Calcium Carbonate Content, Some Chemical And Physical Properties Of The Sudan Gezira Soils And Their Implications
Ismail, A. M. A. [احمد محمد علي اسماعيل] ( Qatar University , 1991 , Article)Eight soil pcdons representing a range of aridisols, vertisols and recent alluvium were studied for various chemical and physical properties. Generally the soils were clayey except the recent alluvium which was loamy but ... -
A comparative study of the effects of clumping, substrate, light, depth of burial and soil moisture upon the germination of seeds of weeds and crops grown in the sudan gezira.
Ismail, A. M. A. [احمد محمد علي اسماعيل] ( Qatar University , 1985 , Article)The influence of the number of seeds per clump upon germination of oryza sativa L., Gossypium hirsutum L., Brachiaria eruciformis (Sm.) Griseb, Dinbera retroflexa (Vahl) Panz. and Echinochloa colonum (L.) Link was investigated ... -
A critical analysis of "harvest index"
Ismail, A. M. A. [احمد محمد علي اسماعيل] ( Qatar University , 1993 , Article)The many ways in which harvest index ratio (HI) can be used are discussed. A selection of published values for HI are given. Attention is drawn to the confusion in calculating the HI such that some present methods of ... -
Effect Of "Ethrel" On Colour Development And Juice Quality Of Sweet Oranges And Grapefruits
Azab, S. A. [سعيد احمد عزب]; Ismail, A. M. A. [احمد محمد علي اسماعيل] ( Qatar University , 1994 , Article)"Ethrel" was sprayed at 0,120, 420 and 480 ppm on sweet orange and grapefruit trees at fruit maturity stage to improve colouring and juice quality. Changes in fruit colour were observed in both varieties but the results ... -
Floating capital pattern and biomass slope allocation method in the life history of calotropis procera (AIT.) AIT. F.
Ismail, A. M. A. [احمد محمد علي اسماعيل] ( Qatar University , 1992 , Article)Plants of the woody perennial Calotropis procera (Asclepediaceae) were grown from seed to seed-set in an open field. Smith's slope allocation and fractional-allocation or percentage methods were used to study dry matter ... -
Irrigation, Planting Date And Intra-Row Spacing Effects On Soybean Grown Under Dry Farming Systems
Ismail, A. M. A. [احمد محمد علي اسماعيل]; Khalifa, F. M. ( Qatar University , 1987 , Article)Two soybean cultivars (Glycine maxima (L) Merr.) differing in maturity period, leaf size and stem height were sown five times at fortnight intervals during the rainy season at four intra—row spacings under supplementary ... -
Physiological growth analysis of the life-history of calotropis procera (AIT.) AIT. F.
Ismail, A. M. A. [احمد محمد علي اسماعيل] ( Qatar University , 1992 , Article)Growth of Calotropis procera was analysed by distribution of dry weight throughout the plant at various stages in growth. Dry biomass, leaf area index, specific leaf area, leaf weight ratio, leaf area ratio, net assimilation ... -
Plant Population Density Effects On Yield Of Sorghum Grown In A Dry-Land Farming System
Ismail, A. M. A. [احمد محمد علي اسماعيل]; Ali, A. H. ( 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 ... -
Some Aspects Of The Autecology Of Panicum Turgidum Forsk
Ismail, A. M. A. [احمد محمد علي اسماعيل]; El Seed, M. T. ( Qatar University , 1983 , Article)The germination of Panicum turgidum seeds was tested under different conditions. They showed ability to germinate under a range of temperatures from 25-42°C. The maximum percentage of germination was 45%, at 30°C. The ... -
Studies in bidirectional movement in vicia faba l.
Ismail, A. M. A. [احمد محمد علي اسماعيل] ( Qatar University , 1984 , Article)Surgery was used to investigate bidirectional movement in a single vascular bundle of Vicia faba L. In one experiment it was found that radiocarbon had moved upwards and downwards via one isolated bundle when leaf one and ... -
Studies on the biology of eucalyptus micro theca f. Muell in the gezira, sudan i. The behaviour of the seed
Ismail, A. M. A. [احمد محمد علي اسماعيل]; Obeid, M.; Ahmed, A. E. ( Qatar University , 1986 , Article)Eucalyptus microtheca has proved to be a success on the heavy clay soils of the Gezira. This tree species not only seeds regularly and prolifically during the summer, but also, though rarely, seeds during the winter. The ...