P. Tematio et al . / Agricultural Science 2 (2011) 334-340
Copyright © 2011 SciRes. Openly accessible at http://www.scirp.org/journal/AS/
339339
exchangeable cations and t
the optimal equilibrium after
are not enough to restore ef-
fic
rovement lasts only for a
sh
R
5. CONCLUSIONS
The tillage management system is a significant driver
of the Andosol fertility decline. It reduces significantly
the soil organic matter and the CEC content, increases
soil acidity and compaction, and destroys the Andosol
macro-aggregates; the chemical and physical properties
that affect negatively the Andosol quality. The relative
increase of the sum of thehe
cations equilibrium close to
10 years of tillage practice
iently the Andosol fertility.
The burning management system has mitigated influ-
ences on Andosols quality. The severe reduction of the
soil organic matter and the CEC content, and the cations
equilibrium imbalance in the burning management sys-
tem affect negatively the Andosol quality. Inversely, the
net increase of the sum of the exchangeable cations and
the soil pH above 6, and the fairly high soil macro-ag-
gregates abundance contribute to improve significantly
the Andosol quality. But this imp
ort period because the water erosion and it subsequent
nutrients leaching leads to the soil impoverishment.
The fallow management system globally improves
significantly the Andosol quality. It is sustainable in term
of the soil organic matter, the CEC and the sum of the
exchangeable cations increase, and the soil macro-ag-
gregates regeneration after the tillage management sys-
tem practice. But, even 10 years of the fallow manage-
ment system is not enough to regenerate efficiently the
soil macro-aggregates and improve the soil acidity.
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