2005
DOI: 10.1590/s0100-06832005000500009
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Disponibilidade de nitrogênio e fluxos de N2O a partir de solo sob pastagem após aplicação de herbicida

Abstract: RESUMO

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Cited by 22 publications
(17 citation statements)
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“…Other forms of losses of this nutrient in the experimental plots, such as soil ammonia volatilization and leaching can be discarded, because the application of ammonium sulfate was made as a solution; the pots did not have a drainage system and irrigations were performed regularly to maintain the water content at 60% of the maximum water retention capacity; no drenching occurred in the pots after the herbicides were applied; and finally, the period between the harvest of the control and the harvest of pots containing herbicide application treatments was only ten days. On the other hand, the nitrogen losses from soil as N 2 and N 2 O could possibly occur in anaerobic microsites after herbicide application, under dryland conditions (Carmo et al, 2005). However, nitrogen losses by denitrification were small (Carmo et al, 2005), not being of importance to explain the losses that occurred in this work.…”
Section: Resultsmentioning
confidence: 67%
See 1 more Smart Citation
“…Other forms of losses of this nutrient in the experimental plots, such as soil ammonia volatilization and leaching can be discarded, because the application of ammonium sulfate was made as a solution; the pots did not have a drainage system and irrigations were performed regularly to maintain the water content at 60% of the maximum water retention capacity; no drenching occurred in the pots after the herbicides were applied; and finally, the period between the harvest of the control and the harvest of pots containing herbicide application treatments was only ten days. On the other hand, the nitrogen losses from soil as N 2 and N 2 O could possibly occur in anaerobic microsites after herbicide application, under dryland conditions (Carmo et al, 2005). However, nitrogen losses by denitrification were small (Carmo et al, 2005), not being of importance to explain the losses that occurred in this work.…”
Section: Resultsmentioning
confidence: 67%
“…On the other hand, the nitrogen losses from soil as N 2 and N 2 O could possibly occur in anaerobic microsites after herbicide application, under dryland conditions (Carmo et al, 2005). However, nitrogen losses by denitrification were small (Carmo et al, 2005), not being of importance to explain the losses that occurred in this work.…”
Section: Resultsmentioning
confidence: 67%
“…Em relação à amostra de filme polimérico 0% de lignossulfonato (Figura 4) analisada e amostras de filmes contendo lignossulfonato Vixil I (figuras não mostradas), bem como para amostras de filmes contendo lignossulfonato Vixil Tan (figuras não mostradas) foi [38,40,43] . Em relação à emissão de CO 2 (Figura 7) pode ser notado que as amostras de filmes poliméricos contendo lignossulfonato (Vixil S) emitiram maior quantidade de gás carbônico em sua degradação, em relação às demais amostras (p < 0,05).…”
Section: Campagner M R Et Al -Filmes Poliméricos Baseados Em Amidunclassified
“…Ressalta-se que a metodologia de análise da biodegradação e dos gases foi adaptada de outra pesquisa [38] . Não foram encontrados na literatura utilização deste método para avaliar biodegradação de filmes poliméricos de amido, ressaltando este trabalho desenvolvido.…”
Section: Introductionunclassified
“…A quantidade de N 2 O produzido em sistemas agrícolas é determinada pela disponibilidade de NO 3 - (Bouwman, 1996;Brown et al, 2000;Maggiotto et al, 2000), temperatura (Castaldi, 2000), pH (Daum & Schenk, 1998;Mogge et al, 1999), umidade (Zheng et al, 2000;Dobbie & Smith, 2003), além do material orgânico prontamente decomponível e das condições limitantes de difusão de O 2 (Mosier et al, 1991 Nesse contexto, o crescimento do setor agropecuário com a conversão da vegetação nativa em diferentes formas de uso da terra, é necessário conhecer as fontes emissoras dos GEE a fim de colaborar com um diagnóstico mais exato para as tomadas de decisões mitigadoras do aquecimento global. Contudo, a maioria dos estudos envolvendo o fluxo desses gases do solo para a atmosfera estão concentrados na região Sul do Brasil, comparando sistemas de cultivos (La Scala Junior et al, 2001;Costa et al, 2008a;Jantaia et al, 2008;Barreto et al, 2009;Gomes et al, 2009;Siqueira Neto et al, 2009;Escobar et al, 2010) e o fluxo de CH 4 em cultivos de arroz irrigado por inundação (Agostinetto et al, 2002;Costa et al, 2008b), assim como na Amazônia, comparando a transição floresta-pastagem (Steudler et al, 1996;Mellilo et al, 2001;Garcia-Montiel et al, 2002;Fernandes et al, 2002;Passianoto et al, 2003;Carmo et al, 2005;Neill et al, 2005;Wick et al, 2005).…”
Section: Introductionunclassified