Organic matter quality in a soil cultivated with perennial herbaceous legumes

Scientia Agricola

Luciano Pasqualoto Canellas²  José Antonio Azevedo Espindola¹  Carlos Eduardo Rezende¹  Plínio Barbosa De Camargo¹  Daniel Basílio Zandonadi²  Victor Marcos Rumjanek¹  José Guilherme Marinho Guerra¹  Marcelo Grandi Teixeira¹  Raimundo Braz-filho¹ 

[1] ,UENF CCTA Lab. de SolosCampos dos Goytacazes RJ ,Brasil

关键词: FTIR;    fluorescence;    humic acids;    humic substances;    13C;    IVTF;    fluorescência;    ácidos húmicos;    substâncias húmicas;    13C;   

DOI  :  10.1590/S0103-90162004000100010

来源: SciELO

【 摘 要 】

Using herbaceous legumes in agricultural systems yields great quantities of plant residues, allowing changes in soil organic matter quality and content over the years. This study was conducted on an Ultisol, at Seropédica, RJ, Brazil, to evaluate the effects of different perennial herbaceous legumes on soil organic matter quality. A factorial scheme with three replications was used to evaluate the species: forage groundnut cv. BR-14951 (Arachis pintoi), tropical kudzu (Pueraria phaseoloides), and siratro (Macroptilium atropurpureum). After the first cut, each plot was divided into two subplots; plants were cut and left on the soil surface or cut and removed. Soil samples of a closed area covered by spontaneous vegetation (mainly C3 plants) or by Panicum maximum were also analysed. Samples were collected from two layers (0-5 and 5-10 cm), processed for the fractionation of organic matter and the evaluation of structural characteristics of humic acids (HA). Evaluated legumes did not change total organic carbon contents, but promoted HA accumulation in the superficial soil layer. Humic acids may be used as indicators of the management effects on soil organic fractions, because there was significant incorporation of carbon and nitrogen derived from the legume residues, even for the short experimentation time (28 months). Residue management did not modify quantitative aspects of the distribution of the humified organic matter, but promoted, however, a higher condensation degree of humic acids evaluated by the elementary composition, IR and fluorescence spectroscopy.

【 授权许可】

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