Functional analysis of soil organic matter as affected by long‐term manurial treatment

Abstract

Summary The composition of soil organic matter (SOM) is influenced by land use and fertilization. We studied changes in the SOM in a long‐term field experiment on a sandy Podzoluvisol. The control plot and four combinations of manurial treatments of the experiment were selected: one with mineral fertilizer only and three combinations of organic manure with mineral fertilizer: cattle manure + NPK, cattle manure + PK and straw + NPK. The SOM was extracted by sodium pyrophosphate solution (pH = 10) and hot water (100°C). The extracts were analysed by Fourier‐Transform Infrared (FT‐IR) spectroscopy and gel permeation chromatography (GPC). The FT‐IR spectra from sodium pyrophosphate extracts indicate that composition of SOM is indeed influenced by different fertilization. The C=O band at 1710 cm–1 in the samples of the plots fertilized with cattle manure has the highest absorption intensity, whereas the material from the plot fertilized with straw + NPK has the least intense. The GPC analyses of the extracts showed that adding cattle manure + NPK increased the molecular size of SOM in comparison with the control plot. The analysis of hot‐water extracts with FT‐IR showed no significant differences in functional groups, but GPC chromatograms distinguished features in molecular size distribution. Fertilization with cattle manure increased the molecular size of the SOM in comparison with the control, but the differences in content of carboxylic groups and molecular weight were detected in sodium pyrophosphate extracts only.

Changes in chemical properties of distrophic Red Latosol as result of swine wastewater application

“…Such decrease, according to the authors, occurred due to the priming effect of carbon, which is the carbon reduction in soil after the input of organic matter in the area. Ellerbrock et al (1999) did not find alteration in the total content of C in soil either. This could be explained by the low contents of manure dry matter or by the characteristics of the carbon from swine liquid manure, rich in polysaccharides, protein, lipids, and other compounds that are thought to be easily degraded.…”

Copper, zinc and manganese in soils of two watersheds in Santa Catarina with intensive use of pig slurry

“…These authors evaluated the properties of soil treated with 28 pig slurry applications in a four year period in an area from which most of the plant matter produced was removed to feed cattle. Similalry, Ellerbrock et al (1999) observed no alteration in the total soil C content in a 34 year application period. This behavior may be explained by the low dry matter content of manure or by the proper characteristics of the carbon-containing compounds of pig slurry, which, for being rich in polysaccharides, protein, lipids and other compounds (Dinel & Gregorich, 1995), are considered easily degradable.…”

Impacto da água residuária de suinocultura no solo e na produção de capim-elefante

“…Resultados obtidos neste trabalho corroboram com os obtidos por Ceretta et al (2003) os quais, trabalhando com aplicações de dejetos líquidos em pastagens, também não constataram aumento no teor de C orgânico no solo, após 48 meses de aplicações sucessivas. Ellerbrock et al (1999), também não encontraram alteração no conteúdo total de C no solo, o que poderia ser explicado pelos baixos teores de matéria seca dos dejetos ou pelas próprias características do C dos dejetos líquidos de suínos, A.…”