Abstract
The adoption of
no tillage (SD) has increased worldwide in recent decades and particularly in
Argentina, although sometimes doubts have been raised about its effect on soil
physical properties. The objective of this work was to evaluate changes due to
management systems on some soil parameters associated with porosity and water
storage. They were compared to those proposed as "ideal" or
"critical", according to the literature, and with reference levels
obtained under pristine conditions. The study sites are located in Bengolea,
Monte Buey, Pergamino and Viale. At each site, two agricultural situations with
different intensities of management (Good Practices and Poor Practices), and a
natural situation (Natural Environment) were evaluated. Bulk density, total
porosity, volume of different pore sizes (macropores, mesopores and
micropores), and total organic carbon and its fractions were determined in soil
samples (0-10 cm). The lower levels of total organic carbon due to agricultural
practices caused a decrease in total porosity, mainly reflected by the lower
volume of macropores, which decreased up to 23%. Agricultural use resulted in
soil compaction, although not critical, due to a decrease of the macropores.
Bulk density values were within the optimal range, although problems of
compaction can occur when the values of index of structural stability are below
6.13. Total organic carbon and the index of structural stability were the only
variables with values lower than optimal in agricultural soils, allowing to differentiate,
at some sites, between good and poor practices.
Duval M.E.,
J.A. Galantini, J.M. Martínez. F.M. López, L.G. Wall. 2015. Evaluación de la
calidad física de los suelos de la región pampeana: efecto de las prácticas de
manejo. Ciencias Agronómicas RIFCA-UNR
25: 33-43. ISSN Impreso:
1853-4333 ISSN On-Line: 2250-8872
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