Geostatistical analysis of spatial variation of some agricultural land characteristics and their thematic mapping.

摘要

The spatial variability of sand, silt and clay fractions, organic matter, available P and exchangeable K were determined for an agricultural soil in Mantua Province, Italy. Variograms were calculated to describe the spatial dependence of the data. Akriging interpolation was carried out based on the variograms and estimates obtained of the spatial variability of the parameters. A significant concentration of loam was found in the southwestern part of the investigated area. Large clay fraction values which were also indicated on the thematic map corresponded to areas occupied by Vertisols, Entisols and Inceptisols. Organic matter values ranged from 8.7 to 40.8 g/kg, corresponding to data from geostatistical references. The significance of the results for cultivation purposes is briefly considered. Data are tabulated and shown in diagrams and maps.