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Effet in vitro de la roche verte de Gangila sur les propriétés physico-chimiques des sols sableux de l'hinterland de Kinshasa (RD Congo)

Ruben Koy Kasongo UGent, Prosper Kanyankogote, Ann Verdoodt UGent, Geert Baert UGent, Mathijs Dumon UGent and Eric Van Ranst UGent (2012) CANADIAN JOURNAL OF SOIL SCIENCE. 92(5). p.787-791
abstract
The green rocks of Gangila (Lower Congo) are mainly made up of amphibolites and green schists and have a high nutrient capacity. A laboratory experiment was conducted to study the effects of these rock fertilizers on various physico-chemical properties of the sandy soils of Kinshasa's hinterland, DR Congo. These soils are classified as Orthic Regosols in the Canadian system of soil classification (Arenosols in WRB) and are characterized by a low chemical fertility, a very limited water-holding capacity, and an acid reaction resulting in Al and Mn toxicities. Four rates (0.0, 12.5, 25.0, and 50.0 Mg ha(-1)) of finely ground green rocks were mixed with topsoil (0-25 cm), and incubated and leached for 3, 6, 9, 12, 15, and 18 mo, respectively. The use of these ground rocks as amendment resulted in a significant increase in pH (>5.5), available phosphorus, sum of basic cations (SBC) and CEC, and significantly increased the water retention by about 3% (volume). Increases of available P by up to 50%, SBC by 2,2 cmol(c) kg(-1) and CEC by 75% were obtained in soils amended with 50.0 Mg ha(-1) of green rock after 6 mo of incubation. Furthermore, the increased soil pH and decreased pH(0) (point of zero charge) due to silicate sorption, brought about a significant increase of negative charges, CECB (basic cation exchange capacity) and CECT (total cation exchange capacity) with complete neutralization of phytotoxic exchangeable Al (pH - H2O > 5,5). The leaching study revealed that the application of ground rocks of Gangila significantly affected the cation dynamics and immobilized certain micronutrients (Fe, Mn, Cu, Zn). The relative loss of monovalent cations (K+, Na+) was significantly higher compared with that of the bivalent ones (Ca++ Mg++). Green rocks of Gangila can be used as a natural amendment to increase soil fertility of sandy tropical soils.
Please use this url to cite or link to this publication:
author
organization
alternative title
In vitro effect of Gangila green rocks on the physico-chemical properties of sandy soils in the hinterland of Kinshasa (DR Congo)
year
type
journalArticle (original)
publication status
published
subject
keyword
green rocks of Gangila, Arenosols, soil fertility, water holding capacity, negative variable charge, HIGHLY WEATHERED SOILS, GROUND BASALT, CHEMICAL-PROPERTIES, VARIABLE CHARGE, PH, DISSOLUTION, SILICATE, MINERALS, COLLOIDS, SYSTEMS
journal title
CANADIAN JOURNAL OF SOIL SCIENCE
Can. J. Soil Sci.
volume
92
issue
5
pages
787 - 791
Web of Science type
Article
Web of Science id
000307924500008
JCR category
SOIL SCIENCE
JCR impact factor
0.912 (2012)
JCR rank
23/34 (2012)
JCR quartile
3 (2012)
ISSN
0008-4271
DOI
10.4141/CJSS2011-116
language
French
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2979169
handle
http://hdl.handle.net/1854/LU-2979169
date created
2012-09-05 13:09:11
date last changed
2012-09-28 14:47:07
@article{2979169,
  abstract     = {The green rocks of Gangila (Lower Congo) are mainly made up of amphibolites and green schists and have a high nutrient capacity. A laboratory experiment was conducted to study the effects of these rock fertilizers on various physico-chemical properties of the sandy soils of Kinshasa's hinterland, DR Congo. These soils are classified as Orthic Regosols in the Canadian system of soil classification (Arenosols in WRB) and are characterized by a low chemical fertility, a very limited water-holding capacity, and an acid reaction resulting in Al and Mn toxicities. Four rates (0.0, 12.5, 25.0, and 50.0 Mg ha(-1)) of finely ground green rocks were mixed with topsoil (0-25 cm), and incubated and leached for 3, 6, 9, 12, 15, and 18 mo, respectively. The use of these ground rocks as amendment resulted in a significant increase in pH ({\textrangle}5.5), available phosphorus, sum of basic cations (SBC) and CEC, and significantly increased the water retention by about 3\% (volume). Increases of available P by up to 50\%, SBC by 2,2 cmol(c) kg(-1) and CEC by 75\% were obtained in soils amended with 50.0 Mg ha(-1) of green rock after 6 mo of incubation. Furthermore, the increased soil pH and decreased pH(0) (point of zero charge) due to silicate sorption, brought about a significant increase of negative charges, CECB (basic cation exchange capacity) and CECT (total cation exchange capacity) with complete neutralization of phytotoxic exchangeable Al (pH - H2O {\textrangle} 5,5). The leaching study revealed that the application of ground rocks of Gangila significantly affected the cation dynamics and immobilized certain micronutrients (Fe, Mn, Cu, Zn). The relative loss of monovalent cations (K+, Na+) was significantly higher compared with that of the bivalent ones (Ca++ Mg++). Green rocks of Gangila can be used as a natural amendment to increase soil fertility of sandy tropical soils.},
  author       = {Koy Kasongo, Ruben and Kanyankogote, Prosper and Verdoodt, Ann and Baert, Geert and Dumon, Mathijs and Van Ranst, Eric},
  issn         = {0008-4271},
  journal      = {CANADIAN JOURNAL OF SOIL SCIENCE},
  keyword      = {green rocks of Gangila,Arenosols,soil fertility,water holding capacity,negative variable charge,HIGHLY WEATHERED SOILS,GROUND BASALT,CHEMICAL-PROPERTIES,VARIABLE CHARGE,PH,DISSOLUTION,SILICATE,MINERALS,COLLOIDS,SYSTEMS},
  language     = {fre},
  number       = {5},
  pages        = {787--791},
  title        = {Effet in vitro de la roche verte de Gangila sur les propri{\'e}t{\'e}s physico-chimiques des sols sableux de l'hinterland de Kinshasa (RD Congo)},
  url          = {http://dx.doi.org/10.4141/CJSS2011-116},
  volume       = {92},
  year         = {2012},
}

Chicago
Koy Kasongo, Ruben, Prosper Kanyankogote, Ann Verdoodt, Geert Baert, Mathijs Dumon, and Eric Van Ranst. 2012. “Effet in Vitro De La Roche Verte De Gangila Sur Les Propriétés Physico-chimiques Des Sols Sableux De L’hinterland De Kinshasa (RD Congo).” Canadian Journal of Soil Science 92 (5): 787–791.
APA
Koy Kasongo, R., Kanyankogote, P., Verdoodt, A., Baert, G., Dumon, M., & Van Ranst, E. (2012). Effet in vitro de la roche verte de Gangila sur les propriétés physico-chimiques des sols sableux de l’hinterland de Kinshasa (RD Congo). CANADIAN JOURNAL OF SOIL SCIENCE, 92(5), 787–791.
Vancouver
1.
Koy Kasongo R, Kanyankogote P, Verdoodt A, Baert G, Dumon M, Van Ranst E. Effet in vitro de la roche verte de Gangila sur les propriétés physico-chimiques des sols sableux de l’hinterland de Kinshasa (RD Congo). CANADIAN JOURNAL OF SOIL SCIENCE. 2012;92(5):787–91.
MLA
Koy Kasongo, Ruben, Prosper Kanyankogote, Ann Verdoodt, et al. “Effet in Vitro De La Roche Verte De Gangila Sur Les Propriétés Physico-chimiques Des Sols Sableux De L’hinterland De Kinshasa (RD Congo).” CANADIAN JOURNAL OF SOIL SCIENCE 92.5 (2012): 787–791. Print.