Assessment of Soil loss Tolerance limit to Latosol, Argisol and Cambisolin the southern Minas Gerais state
5
Cad. Ciênc. Agrá., v. 11, p. 01–06, 2019. e-ISSN: 2447-6218 / ISSN: 1984-6738
We found T values lower than 11.20 Mg ha
-1
year
-
1
, which is the limit determined by Wishmeier and Smith
(1978). The results obtained for the LVd are below the
limit established by Lombardi Neto and Bertoni (1975)
that range from 9.60 to 15.00 Mg ha
-1
. According to Duan
et al. (2017), this result is due to the wide variation of
T values among the same soil classes. For PVAe, the T
limits are close to the results found by Oliveira et al.
(2008), who observed an average of 7.03 Mg ha
-1
year
-1
in Argisols of Paraíba state.
Density was the main factor that influences the
difference found between the T values of LVd and PVAe
(Table 3). Soil attributes are weighted before the T calcu-
lation, which may lead some factors to have their effect
masked or intensified in the index result. Although the
T has an empirical character, the index results cannot
faithfully indicate a tolerable soil loss. However, T is a
useful tool to support the conservationist land use plan-
ning (Bertol and Almeida, 2000).
Due to the low T limits observed for CXbd (4.75
Mg ha
-
1 year
-1
), this soil class should be prioritized in
the adoption of conservation practices to reduce water
erosion and maintain soil loss levels at acceptable rates.
Therefore, this soil should be used mainly to native ve-
getation protection and to support grasslands cultivation.
It is worth mentioning that T values do not im-
pose arbitrary restrictions on soil management, only act
as a guide to landowners make choices of management
techniques (Lombardi Neto and Bertoni, 1975). Moreover,
considering soils with slow formation rates, any losses
above 1 Mg ha
-1
year
-1
can cause irreversible damage to
its long-term quality (Stefano and Ferro, 2016). Thus, in
the short term, T can be used as a sustainability index,
but even in situations with low erosion rates, practices
that seek to reduce soil losses to values close to zero
should be adopted to ensure soil production capacity
and agricultural system sustainability.
Conclusion
We calculated the Soil Loss Tolerance limits to
Latosols, Argisols, and Cambisols in the Coroado Stream
subbasin. The limits found in the subbasin area ranged
from 4.75 to 7.40 Mg ha
-1
year
-1
, and the Latosol presents
the highest values, followed by the Argisol and Cambi-
sol. Since these are the most common soils found in the
Brazilian territory, the results provided by the work can
be used as a reference to monitoring the erosion process
and promote the sustainability of agricultural activities.
Acknowledgment
The authors thank the Fundação de Amparo à
Pesquisa do Estado de Minas Gerais (FAPEMIG) for the
scholarship offered to the first author. To Ipanema Agrícola
S. A. for funding the research and conceding the study
area. This study was financed in part by the Coordenação
de Aperfeiçoamento de Pessoal de Nível Superior - Brasil
(CAPES) – Finance Code 001.
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