Hydrochemical processes and metal composition of Ain Umm-Sabah natural spring in Al-Hassa Oasis Eastern Province, Saudi Arabia     

Al-Naeem AA 《Pakistan journal of biological sciences: PJBS》2008,11(2):244-249

This study was carried out to determine the hydro-chemical processes and the metal concentration of spring water to evaluate its suitability for irrigation and other purposes. A total of 10 water samples were collected from Ain Umm Sabah at different times and from different locations from the spring basin. EC (dS m(-1)), pH, temperature, total cations (Na, Ca, Mg, K) and anions [Cl, CO3, HCO3, SO4, NO3, Fluoride (F)] were determined. Some trace and heavy metals (Al, As, Ba, B, Br, Mo, Ni, Si, Cd, Cu, V, Fe, I, Pb, Mn, Zn, Sr, Se, Sb, La and Se were determined. The Spring water is classified as C4S2 (high salinity with medium sodicity problem water). Chloride (Cl) and nitrate (NO3) concentrations were higher than the permissible limits according to World Health Organization Standards. The Ain Umm Sabah water is Na-Cl dominant water and can create soil sodicity problems and cause Na and Cl ion toxicity to plants if used for irrigation of sensitive crops. The spring water is under-saturated (negative SI) with respect to calcite, dolomite, gypsum, anhydrite, halite, fluorite and aragonite and oversaturated (positive SI) with respect to goethite, siderite and hematite minerals. The concentration of all the estimated trace metals was within the permissible limits for its use as drinking water and other purposes according to WHO. Since the spring water contains high concentration of NO3, hence can not be used for drinking purposes without prior treatment. The study findings suggest careful use and pumping of water from the spring. Further studies are required on regular basis to monitor the depletion in the spring water level and the temporal change in water salinity.  相似文献   

Cross-bred Cattle Protected against Hyalomma anatolicum anatolicum by Larval Antigens Purified by Immunoaffinity Chromatography     

Ghosh  S.  Khan  M.H.  Ahmed  N. 《Tropical animal health and production》1999,31(5):263-273

Antigens from larvae of Hyalomma anatolicum anatolicum were extracted and purified by immunoaffinity chromatography using immunoglobulin ligands from cross-bred animals immunized with soluble larval antigen. Affinity-purified antigen (Aff-TLE) and a total larval extract (TLE) were used to immunize cross-bred (Bos indicus×Bos taurus) cattle. The group immunized with Aff-TLE rejected 71.6% of larvae and 77.3% of nymphs. However, the rejection percentages were lower in the TLE-immunized group. No significant changes in the feeding period, moulting percentages or moulting period of engorged larvae and nymphs were recorded. There was, however, a significant decrease in the number of resultant nymphs p<0.01) and adults (p<0.01) in the ticks fed on the Aff-TLE-immunized group. The Aff-TLE antigen was 93.3% purified. SDS-PAGE analysis identified a 39 kDa protein, reported for the first time, as the antigen responsible for the induction of resistance in the host.  相似文献   

Evaluation of Trichoderma harzianum for controlling root rot caused by Phytophthora capsici in pepper plants   总被引：5，自引：0，他引：5  

A. Sid Ahmed  C. Pérez-Sánchez  C. Egea  & M. E. Candela 《Plant pathology》1999,48(1):58-65

The ability of Trichoderma harzianum to control the rotting of pepper ( Capsicum annuum ) plant roots caused by Phytophthora capsici was studied. Interactions between the fungi were assessed in vitro on three culture media (V8c, Czapek and 2% water agar) and in vivo in plants grown in a substrate inoculated with P. capsici and T. harzianum . Studies on mutual antagonism in vitro showed that P. capsici was inhibited by T. harzianum ; however, the intensity of inhibition differed according to the medium used, being greatest on Czapek. Analysis of the fungal populations in the plant growth substrate showed that T. harzianum consistently reduced that of P. capsici over time. This reduction in the pathogen population was associated with a reduction in root rot of between 24 and 76%, although plant growth (dry weight) was still reduced by 21.2–24.7%, compared with the uninoculated control. In the absence of T. harzianum with the same pathogen inoculum levels, the reduction in dry weight was 59.8–68.6%, suggesting that T. harzianum reduced the damage.  相似文献   

Allelopathic effects of Leucaena leucocephala leaf litter on some forest and agricultural crops grown in nursery   总被引：1，自引：0，他引：1  

Romel Ahmed  A. T. M. Rafiqul Hoque  Mohammed Kamal Hossain 《林业研究》2008,19(4):298-302

An experiment was conducted to assess the effect of leaf litter of Leucaena leucocephala on two forest crops Sada koroi (Albizia procera), Ipil ipil (L. leucocephala) and three agricultural crops Falen (Vigna unguiculata), Chickpea (Cicer arietinum) and Arhor (Cajanus cajan) in the nursery of the Institute of Forestry and Environmental Sciences, Chittagong University, Bangladesh, in a Randomized Block Design. Results suggested that leaf litters of L. leucocephala induced inhibitory effects on germination and growth of bioassay. It was also found that the effect depended on concentration of extract and litterfall, type of receptor species. Higher concentration of the materials had the higher effect and vice versa. Growth response of receptor crops varied with the variation of leaf litter application. The study revealed that application of low-dose leaf litter specially litter of 10 g·m⁻² had stimulating effect on shoot growth of C. arietinum, V. unguiculata and A. procera. While in all other cases significant inhibitory effect was observed and it was significantly increased with the increase of leaf litter application. However, the trend of inhibition was uneven with treatments. Root growth was found to be more affected than shoot growth.  相似文献   

Biodiversity in Indigenous Germplasm of <Emphasis Type="Italic">Pyrus </Emphasis>from Pakistan Based on Phenotypical and Morphological Traits     

Maqsood Ahmed  Muhammad Akbar Anjum  Sajjad Hussain  Shaghef Ejaz  Shakeel Ahmad  Sezai Ercisli 《Erwerbs-Obstbau》2017,59(1):19-27

A comprehensive analysis of various horticulturally important morphological traits of sixty pear accessions located in five districts of Azad Jammu and Kashmir (Pakistan) was carried out. Several qualitative and quantitative traits were investigated in situ and after the harvesting of leaf and fruit samples. The rich diversity was observed for qualitative traits (i.?e. growth habit, blooming time, intensity of flowering, fruit setting, ripening time, productivity, and fruit shape and color) among pear accessions. As for the quantitative traits, significant variation was observed for leaf area (8.96–27.17 cm²), flowering duration (11–24 days), fruit weight (68.1–322.3 g), average fruit length (2.68–9.87 cm) and average fruit width (1.82–8.12 cm) between pear accessions. Based on qualitative and quantitative data, two dendograms were constructed by using cluster analysis which separated pear accessions into three distinct groups. The cluster analysis showed considerable differences between the accessions for qualitative and quantitative traits. Furthermore, a close association between accessions was noted inside the clusters for qualitative and quantitative traits. The results showed rich diversity and similarity between the pear accessions and needs further assessment at molecular level to elucidate their phylogenetic relationship.  相似文献   

Physico-Chemical Profiling of Promising Sweet Orange Cultivars Grown Under Different Agro-Climatic Conditions of Pakistan     

Syed Bilal Hussain  Muhammad Akbar Anjum  Sajjad Hussain  Shaghef Ejaz  Maqsood Ahmed 《Erwerbs-Obstbau》2017,59(4):315-324

Sweet oranges are produced on large scale all over the world and demanded due to less number of seeds and are better juice quality. A study was carried out with the objective to characterize promising sweet orange cultivars for better quality fruits production under different agro-climatic conditions of Punjab (Pakistan). Fruits of three promising sweet orange (Citrus sinensis L. Osbeck) cultivars viz. ‘Blood Red’, ‘Musambi’ and were harvested from commercial citrus groves at five different locations. Starting from Multan, in the direction of increasing altitude, four more sites viz. Sahiwal, Faisalabad, Sargodha and Chakwal were selected after every 100–150?km distance. Fruits were evaluated in terms of different physical and biochemical characters. Results showed significant influence of climatic conditions on physico-chemical properties of the cultivars at all the locations. Fruits harvested from Multan and Sahiwal showed higher fruit weight, diameter and peel weight. More juicy fruits with higher vitamin C content were produced under mild temperature environmental conditions of Chakwal. Overall, ‘Musambi’ fruits had more total soluble solids and reducing and total sugars. ‘Musambi’ was found to be good source of bioactive compounds i.?e. vitamin C and total phenolic content, had the maximum antioxidant activity as compared to ‘Blood Red’ and ‘Succari’ and may be explored as potential cultivar in Sargodha and Chakwal.  相似文献   

Associating chemical analysis to molecular markers for the valorization of <Emphasis Type="Italic">Citrus aurantium</Emphasis> leaves: a useful starting point for marker-assisted selection     

Myriam Lamine  Fatma Zohra Rahali  Ghaith Hamdaoui  Sawsen Selmi  Ahmed Mliki  Mahmoud Gargouri 《Euphytica》2017,213(2):44

Variation in metabolite composition and content is often observed in citrus, however, it is poorly understood to what extent this variation has a genetic basis. C. aurantium genotypes originating from Tunisia were evaluated to detect genomic (SSR markers) and chemotypic polymorphisms and to discover possible associations between them. A total of fifteen highly polymorphic SSR markers were selected to screen the genetic variability of the most widespread sour orange genotypes. Targeted secondary metabolite profiling analysis generated twenty-one compounds differentially accumulated in the leaves of sour orange genotypes. PCA analysis revealed that genomic and chemotypic data generated similar pattern of clustering, highlighting the intra-specific variability in C. aurantium species. Both data were integrated, leading to the identification of associated SSR alleles with secondary metabolites. Based on results, a relatively high correlation (r = 0.381; p < 0.0001) between chemotypic patterns and genetic markers was identified. Associations between traits of interest for phenolic compounds and genetic markers were tested using statistical methods including three linear model approaches. These results consolidate the presence of a chemical fingerprint that may be suitable for assessing identity and quality of a particular genotype which will be very useful for citrus breeding programs.  相似文献   

Bioassay guided isolation of mosquito biting deterrent compounds from Strumpfia maritima     

Abbas Ali  Mohamed Ahmed Zaki  Abidah Parveen  Zulfiqar Ali  Ikhlas A Khan 《Pest management science》2020,76(7):2342-2346

  相似文献   

氮肥溶液磁化灌溉下土壤入渗特征和水氮迁移规律研究   总被引：1，自引：0，他引：1  

李佳蓓  张富仓  段晨骁  ABDELGHANY Ahmed Elsaye  杨玲  李志军 《农业机械学报》2022,53(7):316-324

为探明不同浓度氮肥溶液磁化前后土壤入渗特征和水氮迁移规律,采用恒定磁场强度300 mT对质量浓度分别为0、0.4、0.7、1.1 g/L的硝酸钾溶液进行磁化处理,以未磁化处理为对照,测定各处理溶液的电导率、pH值、溶氧量、表面张力、累积入渗量、湿润锋运移距离和入渗后不同土壤剖面水氮迁移分布。试验结果表明：磁化处理溶液溶氧量显著提高,电导率和表面张力显著减小,并随溶液浓度变化有显著影响,但对pH值无显著影响。氮肥溶液磁化入渗增大了相同入渗时间内的湿润锋运移距离和累积入渗量,Philip、Green-Ampt、一维代数入渗模型拟合所得参数土壤吸渗率S、饱和导水率K_s以及有效土壤水扩散率■均增大,湿润峰处的土壤水吸力S_f、土壤水分特征曲线和非饱和导水率综合形状系数m均减小,增渗效果随氮肥溶液浓度增大而增大。磁化氮肥溶液可提高土壤持水能力,且随溶液浓度增大持水能力增强,一维代数入渗公式可较好描述不同磁场强度下各浓度溶液土壤入渗结束时的土壤含水率分布情况。氮肥溶液和磁化作用对土壤硝态氮含量的影响呈显著正相关关系,二者共同作用下,磁化高浓度溶液硝态氮含量...  相似文献   

香蕉园主要节肢动物群落多样性研究   总被引：2，自引：0，他引：2  

张永强  阿登  韦绥概  许旭战  黄卫 《广西农业生物科学》2000,19(4):261-266

香蕉园主要节肢动物群落组成有７４科１５２种。优势种包括香蕉冠网蝽（Ｓｅｐｈａｎｉｔｉｓ ｔｙｐｉｃａ）、茶袋蛾（Ｃｒｙｐｔｏｔｈｅｌｅａ ｍｉｎｕｓｃｕｌａ）、香蕉交脉蚜（Ｐｅｎｔａｌｏｎｉａ ｎｉｇｒｏｎｅｒｕｏｓａ）、广西抚蛛（Ｕｌｏｂｏｒｕｓ ｇｕａｎｇｘｉｅｎｓｉｓ）、草间钻头蛛（Ｈｙｌｙｐｈａｎｔｅｓ ｇｒａｍｉｎｉｃｏｌｕｍ）、幼豹蛛（Ｐａｒｄｏｓａ ｐｕｓｉｏｌａ）、立毛蚁（Ｐａｒａ  相似文献