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vol.63 número3VARIACIÓN EN EL TIEMPO DE LAS PROPIEDADES FÍSICAS DE UN SUELO CON ADICIÓN DE ENMIENDAS ORGÁNICASEVALUACIÓN ESPACIAL DEL NITRÓGENO DISPONIBLE DEL SUELO EN UN CULTIVO DE PAPA cv. SPUNTA EN CÓRDOBA, ARGENTINA índice de autoresíndice de materiabúsqueda de artículos
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Agricultura Técnica

versión impresa ISSN 0365-2807

Resumen

ZAGAL, Erick; RODRIGUEZ, Nicasio; VIDAL, Iván  y  HOFMANN, Glenn. Nitrogen use efficiency and dynamics in a rotation with and without use of residues. Agric. Téc. [online]. 2003, vol.63, n.3, pp.298-310. ISSN 0365-2807.  http://dx.doi.org/10.4067/S0365-28072003000300009.

With the objective of studying N use efficiency and dynamics in a rotation with and without management of residues, a labeled-N (15N) experiment was established, in a volcanic soil (Typic Melanoxerand), under irrigation. 15N-labeled micro-plots were installed on a 4-year rotation. 15N was applied only once, as labeled fertilizer or residue, to later follow its fate in the rotation. Treatments applied were as follows: i) T1, rotation with incorporation of residues and inorganic labeled-N; ii) T2, rotation with incorporation of residues and organic labeled-N; iii) T3, rotation without incorporation of residues and inorganic labeled-N. The DM yields of T1 and T3 after two growing seasons, maize (Zea mays) - wheat (Triticum aestivum) was 32.0 and 30.7 t ha-1, respectively, and no significant differences were observed. In this study, maize residues were not a significant source of N for the next crops in the rotation. Incorporation of residues (additional C input) did not lead to higher N retention in the crop system studied for the period considered.

Palabras clave : 15N; crop rotation; irrigation; maize; wheat; volcanic soil.

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