http://hdl.handle.net/123456789/2122 Search the Channel search http://repository.ksu.edu.sa/jspui/simple-search http://hdl.handle.net/123456789/7916 Title: Biological Studies on the Okra Moth , earias vittella (F.) (lepidoptera: noctuidae ) in Jeddah, Saudi Arabia<br/><br/>Authors: Al-Mehmmady, Roqaya M.<br/><br/>Abstract: The life cycle study on Earias vittella (F.) (=Earias fabia Stoll.),reared in natural conditions at the laboratory , on okra pods throughoutone year (1995-1996), revealed that the egg incubation, larval, pupalduration ranged from : 1-5, 6-26 and 5-14 respectively, and the adultmale and female longevities both ranged between 8 and 30 days. Eggmortality was 8.13 % at 31.3 + 0.64°C , 67 + 8.93% R.H. and 0.81%at 27.5 + 2.05C and 58 + 7.34% R.H. Temperature did not influencethe viability of pupae, the percentage of moth emergence - at allmonths - ranged between 85.07% and 97.79 %. Unmated femaleslived longer than mated ones . The moth had 13 generations per yearat an average temperature of 28.65 ± 0.98°C and 60.51 ± 0.9% R.H,from October 1995 to September 1996 with an average generationtime of 38.55 ± 1.28 days. Sat, 01 Jan 2000 00:00:00 GMT http://hdl.handle.net/123456789/6998 Title: Microbial and sensory quality of fresh camel meat treated with organic acid salts and/or bifidobacteria<br/><br/>Authors: Al-Sheddy, I.; Al-Dagal, M.; Bazaraa, W. A.<br/><br/>Abstract: Fresh camel meat samples were treated by dipping In solutions of sodium acetate (10% w/w), potassium sorbate (1.5% w/w), sodium lactate (5% v/v of 60% solution), or trisodium citrate (1.5%w/w) alone or combined with Bifidobacterium breve cell suspension (5%) and stored at 4°C. The pH, psychrotrophs, and sensory attributes were evaluated. Sodium acetate alone or combined with bifidobacteria maintained pH level, extended microbial shelf life (>12 days) and minimized surface discoloration. Bifidobacteria cell suspension when applied alone had negligible effects on microbial and sensory attributes. However, when combined with sodium acetate or potassium sorbate, bifidobacteria exhibited an additive effect on suppressing spoilage microorganisms. Fri, 01 Jan 1999 00:00:00 GMT http://hdl.handle.net/123456789/6903 Title: Characteristics of natural clay deposits in Saudi Arabia and their potential use for nutrients and water conservation<br/><br/>Authors: Sheta, A.S.; Al-Omran, A.M.; Falatah, A.M.; Sallam, Sh. A.; Al-Harbi, A.R.<br/><br/>Abstract: Clay minerals in soils are the key component controlling water storage and movement in irrigated arid lands. Previous studies proved that the application of high quality clay minerals even in low quantities to coarse textured desert soils improved dramatically the water conservation and water use efficiency. The main objective of this research was to identify and characterize clay deposits and their desired characteristics for water conservation and source of nutrients. Forty-seven representative clay deposit samples were collected from different regions of Saudi Arabia. Samples were subjected to physical, chemical, nutrient status and mineralogical characterization. Results indicated that most of the selected sites were rich in natural clays, some were found at the surface while others were exposed in the slopes of the mountainous areas. Data showed relatively high variations in the clay deposit characteristics, particularly in clay contents, salinity, alkalinity and the dominant clay minerals. Smectite clays dominated the clay fraction of deposits collected from Khulays, Jeddah, Al-Hassa and Al-Kharj areas beside attapulgite, kaolinite and other minerals. Dhruma and Rawdat deposits were dominated mostly by kaolinite, illite and smectites. The characteristics of the studied clay deposits as follows: clay content (20-96%), saturation percentage (29-184%), field capacity (14-140%), wilting point (6-64%), available water content (8-77%), ECe dS/m (0.66-47.0), pH (6.82-8.36), CaCO3 (1-52.9%) and CEC cmole/kg (10.3-77.2). It appears that samples with high clay contents have high available water and field capacity. Soluble B was relatively high in some samples collected from Al-Kharj. Nutrient status indicated that available Fe was very high in all samples while other nutrients (K, Mn, Zn and Cu) were high to moderate. Total heavy metals (Cd, Ni, Pb and Co) were low to moderate in most of the studied samples and relatively high in few samples, particularly that collected from the western region. Free Fe oxide (Fed) was the dominant component of the amorphous and free oxides. Amorphous Si and Al were quite variable, Dhruma-Marrat clays contain relatively high Alam than Siam other clays have mostly high Siam than Alam. The presence of oxides and amorphous materials of Fe, Si and Al plays a major role for nutrient retention and water holding.<br/><br/>Description: Soil Sciences and Plant Production Departments. College of Food Sciences and Agriculture, King Saud University. Riyadh. Saudi Arabia Mon, 01 Jan 2007 00:00:00 GMT http://hdl.handle.net/123456789/6202 Title: Allelopathic effects of artemisia monosperma del. Ongermination and seedling growth of some range plant species<br/><br/>Authors: Assaeed, A.M.<br/><br/>Abstract: Artemisia monosperma is observed to be as one of the first species todominate disturbed sand dunes in Saudi Arabia. Despite of its importance as asand stabilizer, it has no forage value. It is feared that this species may arrest thenatural succession of vegetation. A series of controlled environment experimentswas conducted to study the potential allelopathic effects of A. monosperma ongermination and seedling growth and survival of some species of sandy habitat(Lasiurus scindicus, Pennesetum divisum, Scrophularia hypericifolia, andPlantago boissieri). In one experiment, seeds were germinated in aqueousextracts prepared from leaves and inflorescence at a ratio of I: 10 weight tovolume. Seeds were also germinated in a polyethylene glycol solution having anosmotic potential similar to that of extracts and in distilled water for comparison.In a second experiment, seeds were sown in IO-cm pots filled with sand andcovered with a layer ofO, 1,2 or 3g ground foliage (leaves and inflorescence) tosimulate the effect of litter leachate on seedling growth and survival. In a thirdexperiment, the effect of root exudates on seedling growth and survival wasstudied by irrigating recipient plants with either tap water (control) or leachatesfrom intact one-year old A. monosperma plants grown in warm (30°C) or cool(20°C) temperatures. Results indicated that seed germination (except in S.hypericifolia) was partially controlled by the osmotic potential of extracts. Theaqueous extracts were not significantly different in their effect on germination.The impact on germination ranged between 50-60% reduction in L. scindicus to acomplete germination inhibition in S. hypericifolia and P. biossieri. Addition ofA. monosperma litter to soil surface decreased seedling relative growth rate(RGR) and survival in proportion to the amount of litter added. Artemisiamonosperma root exudates did not affect seedling biomass but reduced root toshoot ratio regardless of temperature, reduced RGR under warm temperature anddecreased seedling survival especially in S. hypericifolia where complete seedlingdeath occurred irrespective of temperature. These results have some practicalimportance when selecting for species in revegetation programs inA.monosperma- dominated sandy areas. Wed, 01 Jan 2003 00:00:00 GMT