Artículo
Tillage effects on labile pools of soil organic nitrogen in a semi-humid climate of Argentina: A long-term field study
Fecha de publicación:
06/2017
Editorial:
Elsevier Science
Revista:
Soil & Tillage Research
ISSN:
0167-1987
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Tillage systems strongly affect nitrogen (N) mineralization. However, there is still only limited information on the relationship between N in labile soil organic matter (SOM) fractions and crop N uptake under different tillage systems in areas with poor water availability. This study discusses the long-term effect of two tillage systems on i) the N-content in labile organic matter fractions and their relationship with the N mineralization potential at three depths (0?5; 0?10 and 0?20 cm), ii) the factors that affect the N mineralization potential, and iii) the relationship between potentially mineralizable N (N0) and crop N uptake in a semi-humid climate. In a long-term experiment, a Typic Argiudoll was sampled under two contrasting tillage systems: no-tillage (NT) and conventional tillage (CT). The soil sampling was performed over four years of the crop sequence (2003, 2009, 2010 and 2011) when the plots were sown with winter wheat (Triticum aestivum L.). They were analyzed for N0 in the form of anaerobic N, soil organic nitrogen (SON), physically separated SOM fractions and crop N uptake. Higher values of SON and labile soil N fractions were observed under NT at all three depths. Significant differences in N0 were found between the tillage systems, with greater values under NT. Significant (P < 0.05) and positive correlations between N0 and fine particulate organic carbon (fPOM-C) (r ≥ 0.66) were found in CT and in NT at the three depths, whereas highly significant (P < 0.001) and negative relationships between N0 and fine particulate organic N (fPOM-N) (r ≥ −0.83) were found under both tillage systems at 0?5 and 0?10 cm. The most pronounced difference in these relationships between tillage systems was observed at the 0?5 cm soil depth. Significant correlations of N0 with residue input from previous crops and the fallow period were observed under both tillage systems and for all three depths. Regarding the relationships between N0 and wheat N uptake, no significant correlations were found for any tillage system or depth. Soil organic N fractions were shown to be strongly influenced by the residue input from the previous crop and by variable weather conditions during the fallow period. The higher content of SON fractions under NT was associated with a higher N mineralization potential, however, it did not result in increased N availability and N uptake by wheat, because of climatic conditions during the crop growing season.
Palabras clave:
Potentially Mineralizable N
,
Soil Labile Fractions
,
Tillage Systems
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CERZOS)
Articulos de CENTRO REC.NAT.RENOVABLES DE ZONA SEMIARIDA(I)
Articulos de CENTRO REC.NAT.RENOVABLES DE ZONA SEMIARIDA(I)
Citación
Martinez, Juan Manuel; Galantini, Juan Alberto; Duval, Matias Ezequiel; López, Fernando Manuel; Tillage effects on labile pools of soil organic nitrogen in a semi-humid climate of Argentina: A long-term field study; Elsevier Science; Soil & Tillage Research; 169; 6-2017; 71-80
Compartir
Altmétricas