01915naa a2200337 a 450000100080000000500110000800800410001910000210006024500620008126000090014330000160015250000830016852009350025165000130118665000090119965000150120865000090122365000150123265000170124765300140126465300160127865300150129465300150130970000230132470000180134770000180136570000150138370000210139870000180141977301400143711342192020-03-11       2000    bl uuuu     u00u1 u    #d1 aFANTE JUNIOR, L.  aEvaluation of a soil compaction as concerned to land use.  c2000  ap. 125-130.  aTrabalho apresentado no Workshop on Agricultural tomography, 1999, Sao Carlos.  aThe main objectives of this paper were (1) to determine soil bulk density of undisturbed samples, using both conventional and computed tomography (C.T.) techniques to identify soil compaction processes and (2) to compare the two methodologies. Soil samples were collected in a semi-arid region of Petrolina, PE, Brazil, along the soil profile, in O.1 m steps down to 1 m depth, at two sites: 1. Soil under natural vegetation "caatinga", and 2. Cultivated soil irrigated by central pivot. Soil C.T. scanning was performed with a first generation C.T. scanner and the conventional method was the gravimetric method (mass and volume measurement of the sealed clods). Results suggest that there is a natural soil compaction in deeper layers, and for the pivot irrigated area, the presence of man induced compacted layer, between 0 and 0.4 m. The comparison of the methods presented soil buk density values of satisfactory coincidence.  aland use  asoil  atomography  aSolo  aTomografia  aUso da Terra  aAvaliacao  aCompactacao  aCompaction  aEvaluation1 aOLIVEIRA, J. C. M.1 aBASSOI, L. H.1 aVAZ, C. M. P.1 aMACEDO, A.1 aBACCHI, O. O. S.1 aREICHARDT, K.  tIn: CRUVINEL, P. E.; COLNAGO, L. A. (Ed.). Advances in agricultural tomography. Sao Carlos: Embrapa Agricultural Instrumentation, 2000.