116 research outputs found
Analysis of historical changes in soil fertility and organic matter levels of the North American Great Plains
Non-Peer Reviewe
Simulação dos efeitos das mudanças do uso da terra na dinùmica de carbono no solo na bacia do rio Piracicaba
In silico assessment of the potential of basalt amendments to reduce N2O emissions from bioenergy crops
The potential of largeâscale deployment of basalt to reduce N2O emissions from cultivated soils may contribute to climate stabilization beyond the CO2âremoval effect from enhanced weathering. We used 3 years of field observations from maize (Zea mays) and miscanthus (Miscanthus Ă giganteus) to improve the nitrogen (N) module of the DayCent model and evaluate the potential of basalt amendments to reduce N losses and increase yields from two bioenergy crops. We found 20%â60% improvement in our N2O flux estimates over previous model descriptions. Model results predict that the application of basalt would reduce N2O emissions by 16% in maize and 9% in miscanthus. Lower N2O emissions responded to increases in the N2:N2O ratio of denitrification with basaltâinduced increases in soil pH, with minor contributions from the impact of P additions (a minor component of some basalts) on N immobilization. The larger reduction of N2O emissions in maize than in miscanthus was likely explained by a synergistic effect between soil pH and N content, leading to a higher sensitivity of the N2:N2O ratio to changes in pH in heavily fertilized maize. Basalt amendments led to modest increases in modeled yields and the nitrogen use efficiency (i.e., fertilizerâN recover in crop production) of maize but did not affect the productivity of miscanthus. However, enhanced soil P availability maintained the longâterm productivity of crops with high nutrient requirements. The alleviation of plant P limitation led to enhanced plant N uptake, thereby contributing to lower microbial N availability and N2O emissions from crops with high nutrient requirements. Our results from the improved model suggest that the largeâscale deployment of basalt, by reducing N2O fluxes of cropping systems, could contribute to the sustainable intensification of agriculture and enhance the climate mitigation potential of bioenergy with carbon capture and storage strategies
Calibration of the century, apsim and ndicea models of decomposition and n mineralization of plant residues in the humid tropics
Modeling changes in organic carbon stocks for distinct soils in southeastern brazil after four eucalyptus rotations using the century model
Acute and chronic nervous signs in cattle associated with Phalaris angusta poisoning in Argentina
Perda de nitrogĂȘnio pela Brachiaria decumbens apĂłs a antese: relação com a umidade do solo
- âŠ