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Spatial variability of agricultural soil parameters in southern Spain

Abstract

Spatial patterns for seven soil chemical properties and textures were examined in two fields in southern Spain (Monclova and Caracol, province of Seville, Andalusia) in order to identify their spatial distribution for the implementation of a site-specific fertilization practice. Two sampling grids of 35×20 and 35×35 m were established in Caracol and Monclova, respectively. Fourteen and eight georeferenced soil samples per hectare were collected at two depths (0–0.1 and 0.25–0.35 m) in early November 1998 before fertilizing and planting the winter crop. Data were analyzed both statistically and geostatistically on the basis of the semivariogram. The spatial distribution model and spatial dependence level varied both between and within locations. Some of the soil properties showed lack of spatial dependence at both depths and at the chosen interval (lag h). Such was the case for clay, organic matter and NH4 at Monclova; and clay and NH4 at Caracol. Bray P and exchangeable K showed a strong patchy distribution at any field and depth. It is important to know the spatial dependence of soil parameters, as management parameters with strong spatial dependence (patchy distribution) will be more readily managed and an accurate site-specific fertilization scheme for precision farming more easily developed.

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Correspondence to Francisca López-Granados.

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López-Granados, F., Jurado-Expósito, M., Atenciano, S. et al. Spatial variability of agricultural soil parameters in southern Spain. Plant and Soil 246, 97–105 (2002). https://doi.org/10.1023/A:1021568415380

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  • DOI: https://doi.org/10.1023/A:1021568415380

  • geostatistics
  • ordinary kriging
  • patches
  • precision farming
  • spatial distribution