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The aim of this study was to evaluate the potential of magnetic susceptibility in estimating soil attributes and to map specific management areas under sugar cane cultivation. Two experiments were carried out. In the first, 50 points were sampled, at random, in an area of 2 ha, in 0.00 to 0.20 m depth. It has been constructed a calibration curve in order to convert the soil sample readings, taken from the balance, in magnetic susceptibility measurements. The magnetic susceptibility measured by an analytical balance had a 0.58 correlation with the clay content, -0.75 with the organic matter content, 0.41 to saturation and 0.82 with the hematite content in a soil depth from 0.00 to 0.20 m. The multivariate statistical analysis of principal components show that the magnetic susceptibility explains 10.69% of the soil set properties variance. In the second experiment were taken (irregular grid) 110 samples, at random, in a 770 ha area in two different depths, one from 0.00 to 0.20 m and other from 0.20 to 0.40 m, to assess the soil texture and chemical attributes and the magnetic susceptibility. The sugar cane attributes over 32 subareas were also evaluated. The spatial dependence in soil attributes was estimated through the semivariogram, scaled semivariogram and spatial distribution correlation maps. The results show that the magnetic susceptibility presented 33 to 50% error which is lower than the physical and chemical properties to define the specific management areas limits in sugar cane. In addition, the magnetic susceptibility had a significant spatial correlation with the sugar cane chemical and physical attributes and can be used to aid in the specific management areas mapping for sugar cane cultivation.

Suscetibilidade magnética para a estimativa de atributos do solo e mapeamento de áreas sob cultivo de cana-de-açúcar