01798nam a2200313 a 450000100080000000500110000800800410001910000170006024500840007726002260016130000140038752007740040165000220117565000160119765000220121365000260123565000370126165000260129865000290132465000110135365000140136465300130137865300110139165300150140265300110141765300210142870000150144970000200146416689632019-01-22       1995    bl uuuu     u00u1 u    #d1 aFELDMANN, F.  aAgricultural systems in Amazonia depend on the management of mycorrhizal fungi.  aIn: SYMPOSIUM ON THE MANAGEMENT AND REHABILITATION OF DEGRADED AREAS AND SECONDARY FORESTS IN AMAZONIA, 1993, Santarém. Proceedings... Rio Piedras: International Institute of Tropical Forestry/USDA - Forest Servicec1995  ap. 54-61.  aA large number of useful tropical plant species are dependent on mycorrhizal fungi. Without the fungal symbionts they show growth depression and lower tolerance to biotic and abiotic stresses. In plant production systems, common management practices normally result in symbiosis deficits. In tropical regions where the system of shifting cultivation is practiced, the fallow period was thought to have a positive regulating effect on the mycorrhizal situation. It's showed that between three and eight years of fallow there is an increase of the inoculum potential in the soils but the effectivity of the fungal populations remains very low in comparison to the populations from natural sites. The need to manage the mycorrhizal fungi in situ in the field is discussed.  amultiple cropping  amycorrhizae  asoil conservation  atropical rain forests  avesicular arbuscular mycorrhizae  aConservação do Solo  aFloresta Tropical Úmida  aManejo  aMicorriza  aAmazonas  aBrasil  aManagement  aManaus  aMultiplo cultivo1 aIDCZAK, E.1 aNUNES, C. D. M.