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| Carvalho,Arminda Moreira de; Bustamante,Mercedes Maria da Cunha; Coser,Thais Rodrigues; Marchão,Robélio Leandro; Malaquias,Juaci Vitória. |
| Abstract The objective of this work was to evaluate the effect of two legumes (Crotalaria juncea and Mucuna pruriens), as cover crops, and of natural fallow, as a control treatment, on the emissions of NOx, N2O, and CO2 from an Oxisol cultivated with corn, under conventional and no-tillage systems, in the Cerrado region, in Central Brazil. Variations of CO2 fluxes in the soil were explained mainly by soil humidity and, in the legumes, under conventional system, by soil NH4+-N concentration. Plots with legumes under no-tillage system had higher annual emissions of CO2, NOx, and N2O than natural fallow. Results show that the use of legumes as cover crops favors the emissions of NOx-N + N2O-N and CO2-C. However, when considering the potential for mitigation... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crotalaria juncea; Mucuna pruriens; Carbon and nitrogen stocks; Cerrado; Mitigating greenhouse gases. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000901213 |
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| Cecagno,Diego; Anghinoni,Ibanor; Costa,Sérgio Ely Valadão Gigante de Andrade; Brambilla,Daniel Martins; Martins,Amanda Posselt; Magiero,Emanuelle Cavazini; Bagatini,Tatiane; Assmann,Joice Mari; Nabinger,Carlos. |
| ABSTRACT: Native pastures are of great importance for cattle and sheep nutrition in the Pampa biome. However, due to its low productivity, the Italian ryegrass introduction and the nitrogen (N) fertilization are alternatives proposed to intensify livestock production in a sustainable manner. The objective of this study was to evaluate the effects of long-term N application on soil health indicators in a native pasture with Italian ryegrass introduction in southern Brazil. The experiment consists of a secondary native pasture under continuous grazing and constant herbage allowance. In 1996 experimental area was broadcast limed and the experiment was initiated, testing three N topdressing rates (0, 100 and 200kg N ha-1 year-1). In 2010 soil of experimental... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carbon and nitrogen stocks; Microbial biomass; Natural pasture.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000500252 |
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