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| Titel |
Physical and Chemical Characterization of a Rhodic Hapludox after 12 Years of Agricultural use under Different Management Systems |
| VerfasserIn |
L. F. S. Silva, M. A. Marinho, S. R. Marques, A. Paz González |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250068024
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| Zusammenfassung |
| The agricultural use of land generates modifications on soil physical, chemical and biological
attributes, and frequently the intensive use of mechanization contributes to the degradation of
soil physical and biological quality. This work evaluates the alterations caused by the
agricultural use and management on the quality of a Rhodic Hapludox occurring in
Campinas, SP, Brazil, after 12 years of continuous cultivation. The effects on soil derived
from eight management systems, involving the use of heavy harrow, spring-toothed harrow,
disc plough, rotary tiller, direct seed-drilling and alternate use of equipments, were
compared having as reference a profile of the same soil occurring under forest. The
experiment was installed in eight plots with an area of 600 m2each. Soil sampling
occurred on July, 2003, when undisturbed samples were extracted in five points by
plot at three depths: 0-0.20 m, 0.20-0.40 m e 0.40-0.60 m, to determine soil bulk
density, total porosity, macroporosity and microporosity. Also composite soil samples
were extracted by parcel at three depths: 0-0.10 m, 0.10-0.20 m e 0.20-0.40 m,
to determine the chemical attributes by routine methods. The obtained data were
submitted to exploratory analysis and to ANOVA statistics. Results indicate that there
was a decrease in organic matter and exchangeable calcium contents, and also in
percent base saturation (V) in cultivated soils when compared with the soil under
forest. Exchangeable magnesium content, however, increased under cultivation. For
all management systems, total porosity and macroporosity were lower and soil
bulk density higher than the values observed in the soil under forest. Most of the
evaluated management systems showed significant differences at the 0-0.20 m depth
and some of them at 0.20-0.40 m depth; below 0.40 m, the tillage systems don’t
differ statistically in relation to the evaluated attributes. In comparative terms, the
quality of the soil under cultivation decreased in relation to its quality under forest. |
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