00936nam a2200181 a 450000100080000000500110000800800410001910000200006024500780008026002420015852002660040065000130066665000090067965000170068870000160070570000200072170000130074116721142019-02-18       2002    bl uuuu     u00u1 u    #d1 aTEIXEIRA, W. G.  aComparisons of land use effects on soil bulk density in the Amazon Basin.  aIn: CONGRESSO BRASILEIRO DE SISTEMAS AGROFLORESTAIS, 4., 2002, Ilhéus. Sistemas agroflorestais, tendência da agricultura ecológica nos trópicos: sustento da vida e sustento de vida. Anais. Ilhéus: CEPLAC: UESC, 2002. 1 CD-ROM.c2002  aUnderstanding the process that lead to degradation is an essential element to define suitable land use systems for the these soils. Declining productivity of tropical soils under continuous cultivation, even with supplementary fertilisation, is well documented.  aAmazonia  aSolo  aUso da Terra1 aSCHROTH, G.1 aSOUSA, G. F. de1 aHUWE, B.