Knowledge of the spatial variability of soil chemical components are useful for the
rational use of agricultural inputs, such as the localized application of soil acidity
correctives and fertilizers. The objective of this work was the chemical analysis of an
eutrophic Red Latosol under pasture cultivation of Megathyrsus maximum cv.
Mombaça in an integrated system with Eucalyptus urophyla using multivariate
analysis. The study was done in a farm located in the city of Palmeiras do Tocantins,
with an area of 6.04 hectares under the integrated planting system of Megathyrsus
maximum cv. Mombasa with double lines of Eucalyptus urophyla with an average
spacing of 110 m between rows, in which 40 samples were collected at two depths,
0.00 - 0.10 m and 0.10 - 0.20 m. The soil was classified as a Red Eutrophic Latosol,
the attributes of soil pH (CaCl2), Ca, Mg, Al, K, P, SB, CEC, H + Al and V were
evaluated, as well as sand, silt and clay. With the results the data were submitted to
descriptive analysis and subsequent of principal componentes analysis (PCA). In
general the chemical soil atributes that most contribute to the formation of
components, regardless of depth measurement: pH, Ca, Mg, P, H + Al, and only on
the surface 0.00 - 0.10 m sand and clay . The variables that did not contribute to the
formation of the components were Silt, Al, K, CEC and SB. Through the analysis of
the main components it was possible to understand the dynamics of soil chemical
attributes, to evaluate the chemical quality of the soil and to correlate with the
management of liming and fertilization practiced in the farm.
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