FRANCA, C. C. M.

MARRIEL, I. E.

VASCONCELLOS, C. A.

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I••DYNAMICS OF SOIL CARBON, NITROGEN AND MICROBIAL BIOMASS IN TROPICALAGROECOSYSTEMS. Carlos Alberto Vasconcellos*, Carla Cristina Moura França, IvanildoEvodio Marriel. CNPMS/ EMBRAPA, Caixa Postal 151, 35701.970. Sete Lagoas, MG.The effects of long-term organic residue additions and soil management on the active pool of soilorganic matter, CO2 evolution and microbial biomass N were studied in maize without strawinputs, maize-bean rotation with and without tillage system, native Savannah, continousleguminous tree ( Tefrosia sp) and soybean and maize crops for grain in a Red Oxisol on thetropical region of Sete Lagoas. The areas with soybeans showed the higher rate for CO2 evolvedfollowing areas with continuous maize for grain, native savannah and with Tefrosia; the lowestrates were observed with crop rotation and with continuos maize for silage. Probably due to theseasonal changes of microbial biomass appeared to depend on crop management practices and onsoil moisture. Carbon mineralization was directly related to estimated crop residue-C returned tosoil in dependence of each management practice.I fi: I • E I I I I ~ • I I • fi. I & ~ • • ~ •• • • 11 .1

Dynamics of soil carbon, nitrogen and microbial biomass in tropical agroecosystems.

http://www.alice.cnptia.embrapa.br/alice/bitstream/doc/472494/1/Dynamicssoil.pdf

Dynamics of soil carbon, nitrogen and microbial biomass in tropical agroecosystems.

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