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Changes in Soil Organic Matter Fractions under Subtropical No-Till Cropping Systems

^a Universidade Federal do Rio Grande do Sul, C.P. 776, 90001-970, Porto Alegre (RS), Brazil
^b Embrapa Instrumentação Agropecuária, C.P. 741, 13560-970, São Carlos (SP), Brazil
^c Universidade do Estado de Santa Catarina, C.P. 281, 88520-000, Lages (SC), Brazil

View larger version (20K): [in a new window]   Fig. 1. Relationship between relative soil organic matter (SOM) decay rates and (a) Fe oxides and (b) kaolinite concentrations in the 20- to 53-, 2- to 20-, and <2-µm granulometric fractions of a sandy clay loam Acrisol. Mineral concentrations in soil granulometric fractions were analyzed in composite samples resulting from the mixture of three field replicates. Mean values showed <8% difference among cropping systems.

View larger version (21K): [in a new window]   Fig. 2. Saturation curves of the semiquinone free radical signal by electron spin resonance (ESR) spectroscopy in the 20- to 53-, 2- to 20-, and <2-µm granulometric fractions of Maize + Cajanus cajan cropping system. (a.u. = arbitrary units.)