Soil organic fractions content and quality under wheat production systems in the semiarid Pampas
Soil organic
matter (SOM) is the key factor in the production systems, and the knowledge of
their fractions dynamic and equilibrium is important to reach high productivity
and agriculture sustainability. The effect on organic fractions distribution
and quality of the following production systems were studied: continuous wheat
(TT), wheat–natural grass each year (TP) and wheat – legume (TL). Labile
fractions, physically separated (particulate SOM, MOP) and chemically separated
(fulvic acid, AF), showed high sensibility to crop sequence. Continuous wheat
affected labile and recalcitrant organic fractions contents. The tillage
increase caused SOM decrease, changes in labile to recalcitrant fraction
ratios, nutrient losses (N and S) and modified humic acid (AH) structure. The
AH from cultivated soils showed higher aromatic groups content and lower
aliphatic and N compounds groups than AH from reference soil.
Organic fractions, Production systems, Semiarid region
Galantini J.A. 2001. Contenido y calidad de las fracciones
orgánicas del suelo bajo rotaciones con trigo en la región semiárida pampeana.
Revista de Investigaciones Agropecuarias (RIA-INTA) 30 (1) 125-146.
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