Labile N and the nitrogen management index of oxisols in the Brazilian cerrados

Vista sencilla de ítem
dc.creatorWesterhof, R
dc.creatorVilela, Lourival
dc.creatorAyarza, Miguel Angel
dc.creatorZech, W.
dc.date1999
dc.date2015-01-28T14:17:28Z
dc.date2015-01-28T14:17:28Z
dc.date.accessioned2026-06-27T14:46:17Z
dc.descriptionThe effect of land use on the availability of soil nitrogen (N) was studied by separating total soil N into one labile and one stable fraction by oxidation and extraction of labile N with potassium permanganate. The nitrogen management index (NMI) was calculated according to Blair et al. (1995) for the carbon management index. In all systems, labile N released by potassium permanganate was a better indicator for nitrogen availability than were total and stable N. The NMI was a good indicator for N availability but gave no information on the total amount of N. In land-use system analysis, total N and labile N can be used together as a simple and rapid way to evaluate the nitrogen status of the soil. Legume-based pastures specifically increased the amount of labile N. Although soybeans had a dominant role in the continuous cropping systems studied, total N contents decreased, compared with native savanna. The availability of N under legume-based pastures and legume-based pasture/crop rotations was higher than under native savanna and continuous cropping systems.
dc.formatapplication/pdf
dc.identifierhttps://hdl.handle.net/10568/55133
dc.identifier.urihttp://hdl.handle.net/123456789/87996
dc.languageen
dc.publisherInternational Center for Tropical Agriculture
dc.rightsOpen Access
dc.sourceWesterhof, Roelof; Vilela, Lourival; Ayarza, Miguel Angel; Zech, Wolfgang. 1999. Labile N and the nitrogen management index of oxisols in the Brazilian cerrados. In: Thomas, Richard J.; Ayarza, Miguel Angel (eds.). Sustainable land management for the oxisols of the Latin American savannas: Dynamics of soil organic matter and indicators of soil quality. Centro Internacional de Agricultura Tropical (CIAT), Cali, CO. p. 133-140. (CIAT publication no. 312)
dc.subjectsavannas
dc.subjectland use
dc.subjectmineralization
dc.subjectnitrogen content
dc.subjectoxisols
dc.subjectpotassium permanganate
dc.subjectsabanas
dc.subjectutilización de la tierra
dc.subjectmineralización
dc.subjectcontenido de nitrógeno
dc.subjectoxisoles
dc.subjectpermanganato de potasio
dc.titleLabile N and the nitrogen management index of oxisols in the Brazilian cerrados
dc.typeBook Chapter

Archivos

Colecciones

Centro Internacional de Agricultura Tropical (CIAT)