Resumo

CASTRO, Hugo  e  GUERRERO, Juan Carlos. Evaluation of liming materials using incubation tests in an oxisol from the Colombian highlands. Rev. Cienc. Agr. [online]. 2018, vol.35, n.2, pp.14-26. ISSN 0120-0135.  https://doi.org/10.22267/rcia.183502.88.

Oxisols form one of the broader agricultural frontiers in the world; in South America, there are 243 million hectares, with 17 million in Colombia. Acidity resulting from aluminum, debasification and low availability of phosphorus are the most relevant indicators of chemical infertility in these soils. The objective of the present study was to evaluate the effect of liming materials on controlling acidity and chemical improvement of bases in an oxisol typical of the native savanna in the Colombian Altillanura. Using a completely randomized experiment design, 13 incubation treatments with three replications were defined. The chemical characterization of the problem soil, to which 1.5t.ha-1CaCO3 equivalent was incorporated using different commercial EQCaCO3 liming materials, was determined. At 40 days post-incubation, the chemical variables related to acidity (pH and concentrations of Al3+, Ca2+, Mg2+ and P) were evaluated. The encapsulating materials using simple amendments (calcined dolomites, ground dolomites, calcium and magnesium hydroxides, basic slag and live limes) had a significant effect on the control of acidity and increased the concentrations of Ca2 + and colloidal Mg2 +. A similar response was obtained when the treatments, such as the simple amendments, were mixed with phosphoric rock and organic matter (chicken manure) at a ratio of 75:10:15, respectively. The calcium and magnesium hydroxides and the basic steel slag, used as simple amendments or as part of complex amendments, offered superior effects on controlling acidity, with respect to the rest of the materials.

Palavras-chave : Soil acidity; Liming; Chemical improvement; Incubation tests..

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