%0 Journal Article
%T Variabilidade e correla£¿£¿o espacial de propriedades f¨ªsicas de solo sob plantio direto e preparo convencional
%A Schaffrath
%A Valter Roberto
%A Tormena
%A C¨¢ssio Ant£¿nio
%A Fidalski
%A Jonez
%A Gon£¿alves
%A Ant£¿nio Carlos Andrade
%J Revista Brasileira de Ci¨ºncia do Solo
%D 2008
%I Sociedade Brasileira de Ci¨ºncia do Solo
%R 10.1590/S0100-06832008000400001
%X soil management systems modify the spatial distribution of soil physical properties. the objectives of this study were to verify the spatial dependency and co-relationship of some soil physical properties by data fitting to individual and cross-semivariograms in an oxisol (typic haplorthox) under no-till and conventional tillage, in campo mour£¿o, state of parana, brazil. in april 2004, 128 undisturbed soil samples were collected in a 3 x 5 m grid, in the middle of the 5-0.15 m layer. the following soil physical properties were measured: soil bulk density, macroporosity, microporosity, total soil porosity and soil water content at a tension of 100 hpa (field capacity). the spatial variability in the single semivariogram of these soil physical properties was higher and the range in no-tillage was smaller than in conventional tillage. on the other hand, the cross-semivariogram of soil bulk density and total porosity or field capacity indicated spatial co-relationships with lower spatial variability and higher ranges in no-tillage than conventionally tilled soils. the cross-semivariogram suggested that soil bulk density showed a spatial co-relationships with the other soil physical properties in both soil management systems studied.
%K soil bulk density
%K soil porosity
%K spatial variability
%K cross-semivariogram
%K no-tillage.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0100-06832008000400001&lng=en&nrm=iso&tlng=en