@article{fdi:010060638,
  title = {{A}cidity control in {L}atosols under long-term pastures in the {C}errado region, {B}razil},
  author = {{V}endrame, {P}. {R}. {S}. and {B}rito, {O}. {R}. and {M}artins, {E}. {S}. and {Q}uantin, {C}. and {G}uimaraes, {M}. {F}. and {B}ecquer, {T}hierry},
  editor = {},
  language = {{ENG}},
  abstract = {{H}igh acidity and aluminium saturation are among the main limiting factors for crop production in tropical soils. {T}he aim of this work was to measure the acidity of {L}atosols under pastures in the {B}razilian {C}errado and to assess the influence of clay mineralogy as a controlling parameter of soil acidity. {T}opsoils (n = 73, 0-0.2m depth) of {L}atosols developed on different parent materials were sampled in two sub-regions of the {C}errado region. {T}he main chemical characteristics were determined by standard procedures, and kaolinite and gibbsite contents were determined by dissolution with sulfuric acid and thermogravimetric analyses. {T}he exchangeable concentrations of calcium ({C}a), magnesium ({M}g), and potassium ({K}) varied considerably among soil samples, with ranges of 0-13.9 cmol(c) kg(-1) (mean +/- standard deviation 1.77 +/- 1.91 cmol(c) kg(-1)) for {C}a; 0.2-3.2 cmol(c) kg(-1) (1.13 +/- 0.68 cmol(c) kg(-1)) for {M}g; and 0-1.0 cmol(c) kg(-1) (0.24 +/- 0.24 cmol(c) kg(-1)) for {K}. {T}he mean concentration of exchangeable aluminium ({A}l) was 0.55 +/- 0.61 cmol(c) kg(-1) (range 0-2.3 cmol(c) kg(-1)). {T}he content of kaolinite (282 +/- 96 g kg(-1)) was higher than of gibbsite (106 +/- 77 g kg(-1)). {T}he amount of exchangeable {A}l and {A}l saturation rate varied according to the mineralogy of the clay fraction of the soils. {T}he content of exchangeable {A}l3+ remained low when gibbsite was the predominant mineral, whereas it increased with kaolinite content. {T}he ratio kaolinite/(kaolinite + gibbsite) could be used as a useful indicator of the sensitivity of soils affected by acidity and {A}l toxicity.},
  keywords = {{B}razilian {C}errado soils ; gibbsite ; kaolinite ; protonation ; soil acidification ; {BRESIL}},
  booktitle = {},
  journal = {{S}oil {R}esearch},
  volume = {51},
  numero = {4},
  pages = {253--261},
  ISSN = {1838-675{X}},
  year = {2013},
  DOI = {10.1071/sr12214},
  URL = {https://www.documentation.ird.fr/hor/fdi:010060638},
}