JECET : Journal of Environmental Science, Computer Science and Engineering & Technology. E-ISSN : 2278-179X

      JECET : Journal of Environmental Science, Computer Science and Engineering & Technology

Currently Published Papers in Env Science

Agrochemicals use on carrot (Daucus carota) cultivation and its phytochemicals content at Kedjom-Ketinguh, North- West, Cameroon

Sonchieu Jean, Feh Watad Gilbert, Fru Nsoh John,[DOI: 10.24214/jecet.A.8.1.07283]

Nationwide surveys conducted on pesticide application in Cameroon raised growing concern of the exposure of applicators. The aim of this study was to investigate the agricultural practices in carrot cultivation, phytochemical composition of carrot and the various exposures of farmers associated with the use of agrochemicals in the cultivation of carrot in Kedjom-Ketinguh, Tubah Sub-Division (North-West Region, Cameroon). A questionnaire was randomly administered to 100 carrot cultivation farmers for a period of twelve months. Laboratory analysis was done to determine the content of carrot with flavonoids, total carbohydrates and phenolic acid using spectrophotometric technics. The results obtained indicate that: 95% of the farmers use chemical fertilizers and organic manure (cow dung and fowls drops); 34% of farmers use fungicide such as pencozeb, mancozeb and plantineb, which are bought in local market or from individuals and stored in rooms in the house; the planting  is done in March at 50%, some minor health hazards associated with the use of agrochemicals were observed; the concentration of carbohydrates, flavonoids and phenols varies from the control to treated samples. The carrot produced in Kedjom-Ketinguh may be considered safe for consumption looking at the pesticide use and the quality is improved with the use of organic fertilizers.

Genetic link between HFSE - Base and Precious metals in Mylonite and N-S Lamprophyre Dikes, Abu Rusheid Area, Egypt

Mohamed El-Ahmady Ibrahim and Mohamed Salem Kamar,[DOI: 10.24214/jecet.A.8.1.05271.]

Abu Rusheid area is located at the southern Eastern Desert of Egypt and regarding as closed basin. The ophiolitic metagabbro forms the higher peripheral parts of the basin and thrusted over the ophiolitic mélange. The banded cataclastic rocks (NNW-SSE,300/WSW) were deposited in the central part of basin and subdivided from base to top into; protomylonites, mylonites , ultramylonites and quartzite. They are subjected to regional metamorphism (sillmanite- kaynite - garnet facies) and cut by two shear zones (N-S and E-W trends). The shear zones are intruded by discontinuous and brecciate lamprophyre dikes.The cataclastic rocks were subjected to hydrothermal alteration types, including propylitic, sericitic, Na-metasomatism, ferrugination, fluoritization, and argillation, whereas lamprophyre dikes were underwent ferrugination, kaolinitization, sericitization, and calcification. The mylonites and N-S lamprophyre dikes, are extremely rich in base metals (Pb, Zn, Cu, and As), precious metals (Au and Ag) and HFSE (Nb, U, Zr, HREE and Y). They show MREY > HREY > LREY. The HREEs minerals are represented by xenotime, fergusonite, fluorite and zircon. The average of U/Th ratio in mylonites and lamprophyre dikes (1.3 - 40.0) is higher than protomylonites and ultramylonites (0.24) manifesting migration in and out respectively. Ascending and descending hydrothermal solutions are affected on the Abu Rusheid rocks. These solutions with low temperatures and containing F1− and CO32−, PO43− and H2O caused redistribution; transportation and redeposition of the base metals, precious metals and HFSE from the mylonite rocks through channel ways to lamprophyre dikes, in addition to the clay minerals and carbonates were formed.

Efficacité biologique d’extraits aqueux de substances naturelles (Cassia nigricansVahl., Parkia biglobosa(Jacq.) R. ex G. Donf., Capsicum annum L., Cleome viscosa L.) sur la chenille légionnaire (Spodoptera frugiperda J.E Smith) en culture du maïs et de leurs effets sur les microorganismes d’un sol ferrugineux, au Burkina Faso

K AMBOU Georges and MILLOGO Adama Malick,[DOI: 10.24214/jecet.A.8.1.03651.]

Une étude de l'efficacité biologique de quatre extraits aqueux de substances naturelles (Cassia nigricans, Parkia biglobosa, Capsicum annum, Cleome viscosa) contre Spodoptera frugiperda, qui cause des dommages considérables sur le maïs et de leurs effets sur les microorganismes du sol a été effectué a la vallée du kou, au Burkina Faso. Le dispositif expérimental a été un bloc de Fisher randomisé de six traitements (Témoin non traité, Emamectine benzoate 0,5l/ha, C.nigricans250l/ha. P.biglobosa250l/ha, C.annum250l/ha, C.viscosa250l/ha) en quatre répétitions. Les coefficients d’efficacité biologiques des insecticides ont été déterminés à l’aide de la formule de Afanasseva et al. (1983) et le dénombrement des microorganismes dans le sol sur de milieux de culture gélosés. Les différents extraits ont montré une efficacité contre la population de S. frugiperda ainsi que sur l’évolution des symptômes d’attaques. L’extrait aqueux de C. nigricans, la plus efficace parmi elles,  a permis d’obtenir un coefficient d’efficacité moyen de 62,22 sur les larves de S. Frugiperda entraînant une réduction des symptômes de 12,98% à 13,57%  par rapport au témoin non traité, pendant la période de développement du maïs. L’insecticide de synthèse (Emamectine benzoate) a eu un coefficient d’efficacité biologique moyen de 70 entraînant une réduction des symptômes de 66,98% à 71,22% pendant la même période. Ces facteurs ont permis d’obtenir au C. nigricans et à Emamectine benzoate des augmentations respectives de rendement de 20% et de 23% par rapport au témoin non traité. En outre, les différents produits n’ont pas perturbé la dynamique habituelle de développement des bactéries cellulolytiques, champignons microscopiques, bactéries ammonifiantes et bactéries nitrifiantes. L’extrait aqueux de C. nigricans peut être recommandé comme biopesticide contre S. frugiperda en culture du maïs.

Biological efficiency of natural substances aqueous extracts (Cassia nigricans Vahl., Parkia biglobosa (Jacq.) R. Br. Ex G.Donf., Capsicum annum L., Cleome viscosa L.) against Spodoptera frugiperda J.E. Smith on corn production and their effects on a ferruginous soil microorganisms, in Burkina Faso.

K AMBOU Georges and MILLOGO Adama Malick,[DOI: 10.24214/jecet.A.8.1.03651.]

A study of four natural substances aqueous extracts (Cassia nigricans, Parkiabiglobosa, Capsicum annum, Cleome viscosa) biological efficiency against Spodopterafrugiperda which cause big damages to corn and their effect on soil microorganisms has been done at Kou Valley in Burkina Faso. The experimental design was a randomized fisher bloc of six treatments (Untreated control, benzoate emamectine 0,5l/ha, C. nigricans 250l/ha, P. biglobosa 250l/ha, C. annum 250l / ha, C. viscosa 250l / ha) in four replications. The biological coefficient efficiencies of insecticides have been determined with the help of Afanassevaand al. (1983) formula, and the counting of soil microorganisms has been done on specific media. The different extracts have shown efficacy against S. frugiperda population as on their symptoms evolution on corn leaves. C. nigricans aqueous extract, the most efficient between them, allowed getting an average coefficient efficiency of 62.22% on S. frugiperda larva, leading to symptoms reduction of 12.98 to 13.57 in comparison with the untreated control. The synthetic insecticide (Benzoate emamectin) got an average efficiency coefficient of 70 leading to symptoms reduction of 66.98% to 71.22% during the same period.These factors allowed getting at C. nigricans and at benzoate emamectin respectively yields increases of 20% and 23% in comparison with the untreated control. Indeed, the different products didn’t affect the natural development of cellulolytic bacteria, microscopic fungi, ammonifying and nitrifying bacteria. C. nigricans aqueous extract can be recommended as biopesticide against S. frugiperda on corn production.

Sound channel characteristics of the Red Sea

M. S. Kamel and Maiyza I. A,,[DOI: 10.24214/jecet.A.8.1.02335]

The monthly sound channel characteristics is discussed and the monthly conversion zones is localized in the Red Sea using all the available hydrographic data from the National Oceanographic Data Center (NODC-A) up to 2000 and the Global Temperature Salinity Profile Project (GTSPP) data.The axis of the sound channel, along which the sound energy propagates, varied monthly in depth and magnitude between the surface (1525 m/s) and 250m (1537m/s). The shallow in depth, coincide with the minimum sound speeds, along this axis (conversion zones) are, generally, lies in the northern & southern Red Sea to the south of Ras-Mohamed & to the north of Gulf of Aden and the med-south Red Sea proper.


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