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All Journal Britain International of Exact Sciences Journal (BIoEx Journal)
Kombele M
Option Soil and Water, Institute of Agronomic Sciences of Yangambi, Democratic Republic of the Congo, B.P Kisangani, 1232
Biochemistry, Genetics & Molecular Biology Chemistry Mathematics Medicine & Pharmacology Physics

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Evolution of the Soil Report Carbon / Nitrogen in Relation with the Severity of the Bunette Groove of Cassava (SBM) in Three Agrosystems of the Yakonde Set (Y2) in the Reserve of the Biosphere of Yangambi, DRC Kombele M; Kombele B; Ofeka L; Kolela B; Motosia A.; Bati S; Bohula F.; Kombele F
Britain International of Exact Sciences (BIoEx) Journal Vol 4 No 3 (2022): Britain International of Exact Sciences Journal, September
Publisher : Britain International for Academic Research (BIAR) Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/bioex.v4i3.754

Abstract

The occupation of earth, dominated by the peasant fields of Obama cassava in forest zone on the Yakonde set (Y2) in Yangambi in Congolese central pan (RDC), change quickly and the forest fragmentation bound to the roving agriculture on the giblets-burnt lands became one of the processes dominating the landscape dynamics. In addition to the machete and the ax, fire remained for the agriculturists of the region an excellent means to get rid of the cut vegetation and also to lead physical and chemical modifications quickly in the superficial layers of soil. To put in evidence, the evolution of the values of the C/N report of soil in report to those of the severity of the brunette groove of cassava (SBM) that rages currently in Yangambi (CWAVE project), three agrosystèmes of the Yakonde set (Y2) have been chosen: the secondary forest (FS), the forest recrû (RF) and the grassy fallow (JH). In every in every different type of forests, an extent of 50m x 50m was there cut, arranged and without use of fire and the cuttings healthy and infected of SBM of the cassava of the Obama variety have been planted in lines simple oriented north-south in under-parcels in repeated at random two blocks. In 19 pedological pits of the experimental site, 76 pedological samples have been appropriated in two slices of soil: 0 - 20 cm and 20 - 40 cm of depth. The total organic nitrogen of soil has been measured out by the Kjeldhal method and the carbon, by the method to the bichromate of potassium by humid way and to cold weather (Kombele, 2004, Kakuni, 2020). as for the severity of SBM, she/it has been determined by observations on symptomatic leaves and without the symptoms according to the methods of Sseruwagi and al. (2005) and Mware and al. (2009). The results gotten to four months of age of Obama cassava show that the middle values of the C/N are raised more in the grassy fallow (JH) with 8,76±3,43 and a severity of the SBM of 2,7, consistent of those of the secondary forest (FS) with 7,26±3,37 the C/N and a severity of the SBM of 2,4, those of the forest recrû (RF) with 5,28±3,02 the C/N and a severity of the SBM of 2,1.
Impact of Anthropization on the Contents Made of Copper and Zinc in the Urban Soils: Case of the Concession of the Airport of Simi-simi in Kisangani in the Province of the Tshopo in RD Congo Kombele M; Kirongozi F; Ugencan D; Bati Y; Kombele B; Ofeka L; Lifafu H; Bohula F.; Kombele B. F
Britain International of Exact Sciences (BIoEx) Journal Vol 4 No 3 (2022): Britain International of Exact Sciences Journal, September
Publisher : Britain International for Academic Research (BIAR) Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/bioex.v4i3.755

Abstract

The present survey had like goal to value the impact of Anthropization on the contents made of copper and in zinc of the urban soils in the concession of the airport of Simi-simi suited in the Common Makiso city of Kisangani, Province of the Tshopo in Democratic Republic of Congo. In every substation, the investigatings have been made besides by the polls to the auger or less 60cm of depth. The samples of soil have been appropriated in: 0-10, 10-20, 20-30, 30-40, 40 -50 and 50-60 cm, giving a total of 18 prompt samples thus by substation and 126 prompt samples reduced to 42 composites for all 6 substations as well as the station-reference (witness) that is the concession of the IFA-Yangambi in the PK41 on the Ituri road. The elements traces metallic copper and zinc have been analyzed and have been measured out by the method of ammonium acetate to the atomic absorption spectrophotometer in presence of EDTA to pH7. Middle content made of most elevated copper is of 782,78 µg/g under station of pure and weakest corn that is 328,42µg/g in relation to all other occupations of soil. Middle content made of more elevated zinc in the dense forest (reference) with 62,98±23,57µg/g and weaker in the cassava-peanut substation with 44,59±23,62µg/g by report others occupation of soil studied in our zone of survey. The impacts of anthropisation are negative to the level of zinc, it observes itself so much in the substations that in their respective slices, what means that the activities practiced in the site of the airport of Simi-simi drew on the reserves of their soil made of zinc more that in copper, although in weak quantities that for this last.
Evolution of the Stock of Total Organic Carbon of Soil under the Culture of Cassava (Manihot Crantz esculenta) Installed in no Incineration in a Forest Fallow of the Yakonde Set (Y2) in Relation to the One of the Old Surrounding Secondary Forest of the Re Kombele M; Motondo M; Motosia A; Kolela B; Ugencan D; Lifafu H; Kakuni J; Kombele F; Kombele FM
Britain International of Exact Sciences (BIoEx) Journal Vol 4 No 3 (2022): Britain International of Exact Sciences Journal, September
Publisher : Britain International for Academic Research (BIAR) Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/bioex.v4i3.758

Abstract

The objective pursued in this work is to try to put in evidence the ecological role of the cassava culture installed by no burning of the biomass on the management of the stock of total organic carbon of soil. Thus, an extent of 0,48 ha has been delimited and has been subdivided in 24 parcels in which were installed 24 pedological pits and where 48 samples of soil that means 24 samples no - unsettled and 24 unsettled others, were appropriated in the slices of 0-20 and 20-40 cm of depth these samples served for the determination of the total organic matter, the total organic carbon, the obvious density and of the stock in carbon of soil to seven months of age of the culture of five varieties of cassava. Five cultivars of cassava to know Disanka, Obama, Zizila, Me vuazi and Nsansi have been installed in a fallow forest enhancement by no - incineration of the biomass and an old secondary forest taken like reference, situated in the Yakonde set (Y2) in the Tray Isalowe in Yangambi, RD Congo. The results gotten during our experimentation reveals a relative an impact in the management of the stock of soil carbon by the different cultivars of cassava, with the exception of the Zizila varieties (T3) and Nsansi (T5) in relation to the old secondary forest taken like witness even though that, the analyses statistical attest non meaningful differences between the worth of carbon stock observed so much in soil under the different varieties of cassava that under the old secondary forest. Nevertheless, the no - incineration decorated the most suitable fashion of enhancement of soil in general in the optics of the lasting management of the stock of organic carbon of soil in the agrosystèmes of the tropics and of the region of Yangambi in particular.
Co-Authors Bati S Bati Y Bohula F. Kakuni J Kirongozi F Kolela B Kombele B Kombele B. F Kombele F Kombele FM Lifafu H Motondo M Motosia A Motosia A. Ofeka L Ugencan D