作者: SIDNEY ROSA VIEIRA
DOI: 10.1590/S0006-87051997000100019
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摘要: The majority of experiments on soil management and fertility uses experimental statistical procedures which require statistically independent samples uniform plots. This hypothesis can only be satisfied verified in practice with geostatistical calculations such as semivariograms. objective this paper was to study the spatial variability, within an plot, show use analysis. field selected for is located at Centro Experimental de Campinas, Instituto Agronomico, Campinas (SP), Brazil, a Dusky Red Latosol, had been conventional tillage previous 10 years. A 30 m by plot marked square grid 5 m, resulting 49 sampling points, bulk were collected depths 0-25 cm 25-50 cm, taken laboratory, air dried, sieved 2 mm sieve, submitted routine chemical particle size analysis order obtain clay content, silt delta pH, sum bases, cation exchange capacity, base saturation. Geostatistics used variability coefficients variation found indicate higher all properties than probably due depth. Spatial dependence also stronger It concluded that high considering random would fail detect it.