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The 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) f...


Westerhof, RVilela, LAyarza, Miguel AngelZech, W.[Labile N and the nitrogen management index of oxisols in the Brazilian cerrados]Labile N and the nitrogen management index of oxisols in the Brazilian cerrados

In the Cerrados, a large savanna region in Brazil, the effects of different land use on aggregation in Oxisols were studied, using laser diffraction grain-size analyses. The topsoil of plowed systems had significantly fewer macroaggregates (194-2000 micro m) and a significantly larger fraction of...


Westerhof, RBuurman, PGriethuysen, C. vanAyarza, Miguel AngelVilela, LZech, W.[Aggregation studied by laser diffraction in relation to plowing, soil organic matter, and lime in the Brazilian cerrados]Aggregation studied by laser diffraction in relation to plowing, soil organic matter, and lime in the Brazilian cerrados

The permanganate oxidation procedure is easily performed and may help monitor large areas for their soil organic matter (SOM) quality and nitrogen (N) availability. Knowledge of the chemical characteristics of fractions that are lost or remain after oxidation will help explain results obtained by...


Westerhof, RVilela, LAyarza, Miguel AngelZech, W.[Characterization labile and stable nitrogen]Characterization labile and stable nitrogen

Soil organic matter quality is usually seen as a major attribute of soil quality. In this study, we extracted organic carbon with water (WEOC) or with potassium permanganate (PEOC). We assessed these extractions for their potential as sensitive indicators of the effect of land use on two importan...


Westerhof, RVilela, LAyarza, Miguel AngelZech, W.[Carbon fractions as sensitive indicators of quality of soil organic matter]Carbon fractions as sensitive indicators of quality of soil organic matter
Ayarza, Miguel AngelVilela, LPizarro, Esteban A.Costa, P.H. da[Sistemas agropastoriles basados en leguminosas de usos múltiples]Sistemas agropastoriles basados en leguminosas de usos múltiples
Ayarza, Miguel AngelVilela, LPizarro, Esteban A.Costa, P.H. da[Agropastoral systems based on multiple-purpose legumes]Agropastoral systems based on multiple-purpose legumes

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