| Full text | |
| Author(s): |
Zigomar Menezes de Souza
[1]
;
José Marques Júnior
[2]
;
Gener Tadeu Pereira
[3]
;
Luis Fernando Moreira
[4]
Total Authors: 4
|
| Affiliation: | [1] Universidade Estadual de São Paulo. Faculdade de Ciências Agrárias e Veterinárias. Departamento de Solos e Adubos
[2] Universidade Estadual de São Paulo. Faculdade de Ciências Agrárias e Veterinárias. Departamento de Solos e Adubos
[3] Universidade Estadual de São Paulo. Faculdade de Ciências Agrárias e Veterinárias. Departamento de Ciências Exatas
[4] Universidade Estadual de São Paulo. Faculdade de Ciências Agrárias e Veterinárias
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Ciência Rural; v. 34, n. 6, p. 1763-1771, 2004-12-00. |
| Abstract | |
In a natural landscape soils present a wide variation of the chemical attributes at vertical and horizontal directions, which is result of the interaction among several soil formation factors. This work was developed in Guariba-SP with the objective of evaluating the spatial variability of pH, calcium (Ca), magnesium (Mg) and base saturation (%BS) in an oxisol under sugarcane cultivation, being used statistical classic methods, geostatistics analyses and interpolation techniques. After detailed analysis of the variation of the gradient of slope, at the lowest third of the hillside, two compartments (I and II) were distinguished under which the soils were collected at the crossing points of a regular grid with intervals of 50m, total of 206 points, in the depths of 0.0-0.2m and 0.6-0.8m. The largest ranges found for the spatial variability models were observed in the depth of 0.0-0.2m for all the studied attributes, except for the calcium that presented an inverse behavior, reflecting the effects of the largest weathering degree and of the handling in the natural variability of the soils. Based on the results we derive that small variations in the forms of the landscape can define different spatial variabilities found for the chemical attributes studied. (AU) | |