48 research outputs found
Effect of conservation agriculture on stratification of soil organic matter under cereal-based cropping systems
No full text
Automatic Recovery Estimation of Degraded Soils by Artificial Neural Networks in Function of Chemical and Physical Attributes in Brazilian Savannah Soil
No full textImpact of tillage intensity on carbon and nitrogen pools in surface and sub-surface soils of three long-term field experiments
No full textHumus composition and humification degree of humic acids of alpine meadow soils in the northeastern part of the Qinghai–Tibet Plateau
No full textImpacts of fertilization practices on pH and the pH buffering capacity of calcareous soil
No full textShrinkage of initially very wet soil blocks, cores and clods from a range of European Andosol horizons
No full textEffect of K2SO4 concentration on extractability and isotope signature (δ13C and δ15N) of soil C and N fractions
No full textDetermination of the labile soil carbon (C) and nitrogen (N) fractions and measurement of their isotopic signatures (δ13C and δ15N) has been used widely for characterizing soil C and N transformations. However, methodological questions and comparison of results of different authors have not been fully solved. We studied concentrations and δ13C and δ15N of salt-extractable organic carbon (SEOC), inorganic (N-NH4+ and N-NO3-) and organic nitrogen (SEON) and salt-extractable microbial C (SEMC) and N (SEMN) in 0.05 and 0.5mK2SO4 extracts from a range of soils in Russia. Despite differences in acidity, organic matter and N content and C and N availability in the studied soils, we found consistent patterns of effects of K2SO4 concentration on C and N extractability. Organic C and N were extracted 1.6-5.5 times more effectively with 0.5mK2SO4 than with 0.05mK2SO4. Extra SEOC extractability with greater K2SO4 concentrations did not depend on soil properties within a wide range of pH and organic matter concentrations, but the effect was more pronounced in the most acidic and organic-rich mountain Umbrisols. Extractable microbial C was not affected by K2SO4 concentrations, while SEMN was greater when extracted with 0.5mK2SO4. We demonstrate that the δ13C and δ15N values of extractable non-microbial and microbial C and N are not affected by K2SO4 concentrations, but use of a small concentration of extract (0.05mK2SO4) gives more consistent isotopic results than a larger concentration (0.5m)
