8.3 MICROBIAL BIOMASS IN CONVENTION

8.3 MICROBIAL BIOMASS IN CONVENTIONAL VERSUS NT SYSTEMS IN BRAZIL
SOM may be a useful indicator in assessing the effects related to changes in soil management practices, but quantitative changes in total SOM are usually very slow to provide the necessary sensitivity for a short-term evaluation. Soil microorganisms and their communities, on the other hand, are continually changing and adaptingto modifications in the environment. This expresses the dynamic nature of the soil microbial constituent, so that it can be referred to as a more sensitive indicator in assessing changes in soil quality related to soil management.
To illustrate the use of such a biological indicator on soil quality management in Brazil, we briely describe below the main indings on soil microbial biomass in the NT system in the central region of Parana state, located in the South of Brazil(Venzke Filho et al., 2002). The dynamics of microbial-C and N in soils under the NT system was investigated in two crop sequences (corn/wheat/soybean and soybean/ wheat/soybean) in soils of different textural classes (clay, sandy clay, and sandy clay loam) and different periods of NT adoption (12 and 22 years). The microbial biomass-C and N of the 0–2.5, 2.5–5, 5–10, and 10–20 cm soil layers were measured during 18 months, using the fumigation-extraction method. In the same extract, microbial-N was quantiied by the ninhidrin reactive compounds.

Hasil (Inggris) 1:

8.3 MICROBIAL BIOMASS IN CONVENTIONAL VERSUS NT SYSTEMS IN BRAZILSOM may be a useful indicator in assessing the effects related to changes in soil management practices, but quantitative changes in total SOM are usually very slow to provide the necessary sensitivity for a short-term evaluation. Soil microorganisms and their communities, on the other hand, are continually changing and adaptingto modifications in the environment. This expresses the dynamic nature of the soil microbial constituent, so that it can be referred to as a more sensitive indicator in assessing changes in soil quality related to soil management.To illustrate the use of such a biological indicator on soil quality management in Brazil, we describe below the main briely indings on soil microbial biomass in the NT system in the central region of Paraná state, located in the South of Brazil (Venzke Filho et al., 2002). The dynamics of microbial-C and N in soils under the NT system was investigated in two crop sequences (corn/soybean/wheat and soybean/wheat/soybean) in soils of different textural classes (clay, sandy clay, clay loam and sandy) and different periods of NT does (12 and 22 years). The microbial biomass C and N of the 0 – 2.5 – 2.5, 5, 10, and 5 – 10 – 20 cm soil layers were measured during 6 months, using the fumigation-extraction method. In the same extract, microbial-N was quantiied by the solution reactive compounds.

Hasil (Inggris) 2:

8.3 microbial biomass IN CONVENTIONAL SYSTEMS IN BRAZIL VERSUS NT
SOM may be a useful indicator in assessing the effects related to changes in soil management practices, but quantitative changes in total SOM are usually very slow to provide the Necessary sensitivity for a short-term evaluation. Soil microorganisms and their communities, on the other hand, are continually changing and adaptingto modifications in the environment. This expresses the dynamic nature of the soil microbial constituent, so that it can be Referred to as a more sensitive indicator in assessing changes in soil quality related to soil management.
To illustrate the use of such a biological indicator on soil quality management in Brazil, briely we describe below the main indings on soil microbial biomass in the NT system in the central region of Parana state, located in the South of Brazil (Venzke Filho et al., 2002). The dynamics of microbial-C and N in soils under the NT system was investigated in two crop sequences (corn / wheat / soybean and soybean / wheat / soybean) in soils of different textural classes (clay, sandy clay, and sandy clay loam) and different periods of NT adoption (12 and 22 years). The microbial biomass C and N of the 0-2.5, 2.5-5, 5-10, and 10-20 cm soil layers were measured during 18 months, using the fumigation-extraction method. In the same extract, microbial-N was quantiied by the ninhydrin reactive compounds.