Data/hora: 19/05/2024 04:49:53

Biblioteca(s): 	Embrapa Cerrados.	
Data corrente: 	28/09/2022	
Data da última atualização: 	28/09/2022	
Autoria: 	CARVALHO, A. M. de; SANTOS, D. C. R. dos; RAMOS, M. L. G.; MARCHAO, R. L.; VILELA, L.; SOUSA, T. R. de; MALAQUIAS, J. V.; GONÇALVES, A. D. M. de A.; COSER, T. R.; OLIVEIRA, A. D. de.	
Afiliação: 	ARMINDA MOREIRA DE CARVALHO, CPAC; DIVINA CLEA RESENDE DOS SANTOS; MARIA LUCRECIA GEROSA RAMOS; ROBELIO LEANDRO MARCHAO, CPAC; LOURIVAL VILELA, CPAC; THAIS RODRIGUES DE SOUSA; JUACI VITORIA MALAQUIAS, CPAC; ADRIANO DICESAR MARTINS DE ARAUJO GONÇALVES; THAIS RODRIGUES COSER; ALEXSANDRA DUARTE DE OLIVEIRA, CPAC.	
Título: 	Nitrous Oxide Emissions from a Long-Term Integrated Crop?Livestock System with Two Levels of P and K Fertilization.	
Ano de publicação: 	2022	
Fonte/Imprenta: 	Land, v. 11, n. 1535, 2022.	
Páginas: 	16 p.	
DOI: 	https://doi.org/10.3390/land11091535	
Idioma: 	Inglês	
Conteúdo: 	Abstract: Nitrous oxide (N2O) emissions resulting from nitrogen (N) fertilization have been docu- mented. However, no data on the effects of other nutrients, such as phosphate (P) and potassium (K), on N2O emissions in integrated crop?livestock systems are available so far. In the 2015/2016 and 2016/2017 growing seasons, we measured N2O emissions from a long-term system, established in 1991 in the Cerrado biome (a tropical savanna ecoregion in Brazil), fertilized with two P and K levels. The studied no-tillage farming systems consisted of continuous crops fertilized with half of the recommended P and K rates (CC-F1), continuous crops at the recommended P and K rates (CC-F2), an integrated crop?livestock system with half of the recommended P and K rates (ICL-F1), and an integrated crop?livestock at the recommended P and K rates (ICL-F2). The cumulative N2O emissions (603 days) and soil chemical properties were analyzed as a 2 × 2 factorial design (long-term agricultural systems x fertilization). The cumulative N2O emissions from CC-F2 and ICL-F1 were 2.74 and 1.12 kg N ha&#8722;1, respectively. The yield-scaled N2O emissions from soybean were 55.5% lower from ICL-F1 than from CC-F2 in the 2015/2016 growing season. For off-season sorghum, the mean yield-scaled N2O emissions were 216 mg N2O m&#8722;2 kg&#8722;1 (in a range from 79.83 to 363.52 mg N2O m&#8722;2 kg&#8722;1, for ICL-F2 and CC-F1, respectively). The absence of pasture and the presence of soybean and sorghum promoted the highest cumulative N2O emissions, favored by the recommended rate in relation to half of the P and K. In the total evaluation period (603 days), the presence of grazed land in the years prior to this study and land fertilized with half the recommended P and K rates in an integrated crop?livestock system reduced the resulting cumulative N2O emis- sions by 59%. Thus, we conclude that crop?livestock systems can be beneficial in reducing P and K applications and also in mitigating N2O emissions in comparison with continuous cropping systems fertilized with the full recommended P and K rates. In view of the global fertilizer crisis, this aspect is extremely relevant for agriculture in Brazil and around the world.	
Thesagro: 	Agricultura Sustentável; Efeito Estufa; Gás.	
Thesaurus Nal: 	Greenhouse gas emissions; Sustainable agriculture.	
Categoria do assunto: 	--	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1146942/1/Arminda-Nitrous-Oxide-Emissions-from-a-Long-Term-Integrated.pdf	
Registro original: 	Embrapa Cerrados (CPAC)	
Exemplares: 	CPAC - (37386-1) - UPC - AP - DD - DIGITAL -  - DIGITAL - DIS