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All Journal Budapest International Research in Exact Sciences (BirEx Journal) Britain International of Exact Sciences Journal (BIoEx Journal)
Kombele F
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Civil Engineering, Building, Construction & Architecture Mathematics Medicine & Pharmacology Physics Transportation

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Impact of Anthropization on the Copper and Zinc Contents of Urban Soils. Case of the Concession of the Company Textile for Kisangani (SOTEXKI) in Kisangani in the Province of Tshopo in DR Congo Kombele M; Ofeka L; Bola D; Kirongozi F; Ugencan D; Lifafu H; Kakuni J; Kombele F
Budapest International Research in Exact Sciences (BirEx) Journal Vol 4, No 4 (2022): Budapest International Research in Exact Sciences, October
Publisher : Budapest International Research and Critics University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/birex.v4i4.7005

Abstract

This research has set itself the task of studying the impact of anthropization on the copper and zinc contents of urban soils in the concession of the Textile company of Kisangani (SOTEXKI) in Kisangani in the Province of Tshopo in the DR. Congo. To do this, the soil samples were taken from 6 soil slices: 0-10, 10-20, 20-30, 30-40, 40 -50 and 50-60 cm, thus giving a total of 18 spot samples per substation, i.e. a total of 126 grab samples with the reference station (dense forest). The 126 composite samples were reduced to 42 composite samples for all 7 substations using the auger. Conditioned, these samples were subjected to copper and zinc assays using an atomic absorption spectrophotometer using the ammonium acetate method at pH7 in the presence of EDTA. The results obtained show the following trends:- Soil copper content is higher is 387.95 µg/g and lower with 2.08 µg/g compared to all other land uses, the average soil zinc content is higher with 632 .98 µg/g and lower with 3.85 µg/g compared to all the other land uses of our neighboring station at the SOTEXKI/Kisangani plant. In general, the surface slices of the soils of different substations are richer in copper and zinc. Although generally higher than those of our reference (dense forest), the average values of the levels observed in our various substations are also higher compared to the global critical threshold (20-30 mg/kg of soil). - At this level of research, it is too early to certify that these levels are dangerous for human consumption of agricultural products from the soil of these substations. The impacts of anthropization are negative at the level of zinc, which means that the activities practiced in all the substations in our neighboring station to the factory of the textile company of Kisangani/Kisangani have drawn on the reserves of their soil in zinc more than copper, although in smaller quantities than for the latter.
Influence of Non-incineration System on Soil Carbon/Nitrogen Ratio Values of Yakonde (Y2) Series under Cassava Cultivation in Yangambi, D.R. Congo Kombele M; Motondo M; Motosia A; Kolela B; Ugencan D; Lifafu H; Kombele F; Kakuni J; Kombele FM
Budapest International Research in Exact Sciences (BirEx) Journal Vol 4, No 4 (2022): Budapest International Research in Exact Sciences, October
Publisher : Budapest International Research and Critics University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/birex.v4i4.7006

Abstract

The objective pursued in this research was to assess the potential of cassava cultivation in the non-incineration of cut plant biomass in the management of the stock of organic carbon and its main component in the soil, namely its C/N ratio. . To do this, five cassava cultivars have been introduced including: Obama, M'vuazi, Disanka, Zizila and Sansi. These five cultivars were planted in forest fallow in plots each measuring 0.48ha and repeated four times on the Yakonde series (Y2) on the Isalowe plateau in Yangambi. These plots were developed in non-incineration of biomass and from where 108 disturbed soil samples were taken in two groups, one of 54 samples at one month and the other of 54 samples at six months. culture in soil slices 0-20 and 20-40cm deep. These 108 samples made it possible to evaluate the stock of organic matter (M.O.S), total organic carbon (TOC), total organic nitrogen of the soil in order to determine the values of the carbon/nitrogen ratio at one and six months of age of cultivation of five varieties of cassava. M.O.S under the varieties Disanka (21.2±1.0%), Obama (19.6±0.7%) and Sansi (19.5±2.1%) at six months of age in the 0 range -20cm. While under Obama and Disanka, they were lower and respectively 6.1±1.3% and 7.0±2.9% in the 0-20cm age group at one month. The highest average soil TOC values were observed at six months of age under the Disanka (12.3±0.6%), Obama (11.6±0.7%) and Sansi (11. 3±1.3%) in the 0-20cm range; while the weakest were at one month of age under the varieties Obama (3.5 ± 0.8%) and M'vuazi (4.1 ± 1.7%) in the 20-40cm range. The average values of soil Nt contents which vary from 0.4±0.0 to 1.0±0.0% at the surface and from 0.4±0.1 to 0.9±0.4% at depth under the five varieties of cassava were found to be numerically superior to those of the soil under the old secondary forest in the two slices of soil studied (respectively by 0.5±0.1% and 0.2±0.1%). For the two slices of soil studied, the highest values in Nt of the soil (0.9±0.1% and 1.0±0.0% for the slice of 020cm; 0.9±0.4% and 0.9±0.1% for the 20-40cm slice) are observed at six months of age respectively under the Sansi and Disanka varieties. As for the C/N ratio, it decreases with the depth of the soil, except for the Zizila and Disanka varieties at one month of age. The highest mean values are observed under Sansi (12.4±2.8) at one month of age and under Disanka (12.3±0.3) at six months of age in the 0-20cm range; the weakest are under Obama (7.7±7) at one month and under Zizila (7.5±0.6) at six months of age in the 20-40cm range. In fact, the highest mean value of the C/N ratio remains that of the control forest taken as the reference forest.
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.
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 Bohula F. Bola D Kakuni J Kirongozi F Kolela B Kombele B Kombele FM Kombele M Kombele M Lifafu H Motondo M Motosia A Motosia A. Ofeka L Ugencan D