Grazing intensity and nitrogen fertilization timing to increase soil organic carbon stock and nitrogen in integrated crop-livestock systems
Talyta Zortéa 
, Tangriani Simioni Assmann , Carolina Riviera Duarte Maluche Baretta , Andre Brugnara Soares , Juliana Aparecida Marchetti , Rafaela Dulcieli Daneluz Rintzel , [...]
07/Dec/2023
ABSTRACT Integrated crop-livestock systems (ICLS) foster synergistic relationships to increase nitrogen (N) cycling and soil organic carbon (SOC) accrual in agricultural setups. This study evaluated how the grazing intensity and N fertilization (rates and timing) affect both SOC and N fractions, and soil organic matter chemical composition in an ICLS managed under no-tillage in an Oxisol, six years after initiation. The ICLS was compared to a nearby pasture (PA) and a native forest (NF). The treatments consisted of two grazing […]
Carbon and nitrogen stocks in a Rhodic Nitisol under different tillage methods and mineral and organic fertilizers
Camila Rosana Wuaden , Rodrigo da Silveira Nicoloso , Paulo Cezar Cassol , Caroline Aparecida Matias , Letícia Paweukievicz
07/Dec/2023
ABSTRACT Changes in soil management, for example by more vigorous crops, adoption of conservation tillage and optimization of fertilization, can increase soil organic carbon (SOC) and total nitrogen (TN) stocks. We hypothesized that corn – black oat rotation under no-tillage (NT) and adequate soil fertilization can increase these stocks, compared to conventional tillage (CT). This study compared these two tillage methods and organic with mineral fertilizers, regarding their effects on C and N cycling and SOC and TN stocks in […]
Carbon Stocks in Compartments of Soil Organic Matter 31 Years after Substitution of Native Cerrado Vegetation by Agroecosystems
13/Apr/2016
ABSTRACT Changes in carbon stocks in different compartments of soil organic matter of a clayey Latossolo Vermelho Distrófico (Typic Haplustox), caused by the substitution of native savanna vegetation (cerrado sensu stricto) by agroecosystems, were assessed after 31 years of cultivation. Under native vegetation, a stock of 164.5 Mg ha-1 C was estimated in the 0.00-1.00 m layer. After 31 years of cultivation, these changes in soil C stocks were detected to a depth of 0.60 m. In the case of […]
Efficiency of sodium polytungstate in density fractionation of soil organic matter
01/Dec/2007
Sodium iodide (NaI) and sodium polytungstate (SPT) solutions are being indistinctively used in density fractionation procedures of soil organic matter (SOM). This study aimed to evaluate these two solutions, adjusted to a density of 1.8 kg L-1 (NaI-1.8 and SPT-1.8), and particularly of SPT adjusted to densities of 2.0 (SPT-2.0) and 2.2 kg L-1 (SPT-2.2), with regard to their capacity of recovering the light fraction (LF) of SOM. A 20 g soil sample of the 0-5 cm layer of an Acrisol (PVd) and of a Ferralsol […]