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Detailed soil survey of the experimental station of Ribeirão Preto, SP

This paper deals with soil survey at series level carried out in the Experimental Station of Ribeirão Preto. SP, covering an area of 594 ha. The topography of the area is dominated by ancient remnants rising above a gently undulating surface; it has an Aw climate according to the International System of Köppen; the parent material was derived from basalts and the native vegetation was predominantly Tropical broadleaf forest. Initially observations were carried out in small pits (60 x 60 x 60 cm) or road cuts and all together were described 361 sites. Samples for mechanical and chemical analysis were collected in 174 out of 361 sites. Later nine soil profiles were also described and sampled. The soils of the area were classified into nine taxonomic units of the great groups Eutrortox, Haplortox, Umbriortox, Tropudalf, Eutropept and two soil complexes. The great group Eutrortox was divided into two classes according to the base saturation values of the oxic horizon if higher or lower than 50. Considering both the sum of bases and the base saturation values of the epipedon, the various classes of soils belonging to the suborder orthox were subdivided into phases. The soils of the studied area were classified into 24 mapping units.


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