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Biblioteca(s):  Embrapa Uva e Vinho.
Data corrente:  06/01/2006
Data da última atualização:  13/04/2019
Tipo da produção científica:  Artigo em Periódico Indexado
Autoria:  SILVEIRA, C. P.; NACHTIGALL, G. R.; MONTEIRO, F. A.
Afiliação:  GILMAR RIBEIRO NACHTIGALL, CNPUV.
Título:  Norms for the diagnosis and recommendation integrated system for signal grass.
Ano de publicação:  2005
Fonte/Imprenta:  Scientia Agricola, Piracicaba, v. 62, n. 6, p. 513-519, 2005.
Idioma:  Inglês
Conteúdo:  ABSTRACT: The Diagnosis and Recommendation Integrated System (DRIS) has been proved efficient as a method for nutritional diagnosis in several crops. However there is a lack of information on the use of DRIS for tropical forage grass. The aim of this paper was to establish norms for interpretation of results of analysis from recently expanded leaf laminae of Brachiaria decumbens Stapf. (Signal grass), through the DRIS method. To establish DRIS norms, concentrations of N, P, K, Ca, Mg, S, Cu, Fe, Mn, and Zn and the relative production obtained in six experiments conducted in greenhouse using nutrient solution and silica as substrate were considered. DRIS indices were calculated using two criteria in order to choose the ratio order of nutrients: F value - ratio of variance for the relationships among nutrients between the reference group and the low productivity group; and R value - correlation coefficients between the productivity values and the relationship among the pairs of nutrients, and three forms of calculation for the functions of nutrients (methods of Beaufils, of Jones, and of Elwali & Gascho). The two criteria to choose the ratio order of nutrients selected different ratios between pairs of nutrients; the nutrient concentrations were positively and significantly correlated with the respective DRIS indices, except for N; and DRIS norms are useful for the nutritional diagnosis of the ten studied nutrients in leaf laminae of Signal grass. Key words: Brachiaria decumbe... Mostrar Tudo
Palavras-Chave:  Capim-braquiária; Diagnóstico nutricional; DRIS; Forrageira.
Categoria do assunto:  --
URL:  https://www.alice.cnptia.embrapa.br/alice/bitstream/doc/540863/1/a01v62n6.pdf
Marc:  Mostrar Marc Completo
Registro original:  Embrapa Uva e Vinho (CNPUV)
Biblioteca ID Origem Tipo/Formato Classificação Cutter Registro Volume Status URL
CNPUV7395 - 1UPCAP - DD
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Registro Completo

Biblioteca(s):  Embrapa Trigo.
Data corrente:  19/07/2022
Data da última atualização:  19/07/2022
Tipo da produção científica:  Artigo em Periódico Indexado
Circulação/Nível:  A - 1
Autoria:  VEECK, G. P.; DALMAGO, G. A.; BREMM, T.; BULIGON, L.; JACQUES, R. J. S.; FERNANDES, J. M. C.; SANTI, A.; VARGAS, P. R.; ROBERTI, D. R.
Afiliação:  GUSTAVO PUJOL VEECK, UFSM; GENEI ANTONIO DALMAGO, CNPT; TIAGO BREMM, UFSM; LIDIANE BULIGON, UFSM; RODRIGO JOSEMAR SEMINOTI JACQUES, UFSM; JOSE MAURICIO CUNHA FERNANDES, CNPT; ANDERSON SANTI, CNPT; PAULO ROBERTO VARGAS, Fazenda Capão Grande; DÉBORA REGINA ROBERTI, UFSM.
Título:  CO2 flux in a wheat-soybean succession in subtropical Brazil: A carbon sink.
Ano de publicação:  2022
Fonte/Imprenta:  Journal of Environmental Quality, 1-17, 2022.
DOI:  https://doi.org/10.1002/jeq2.20362
Idioma:  Inglês
Conteúdo:  Abstract: The subtropical region of Brazil is home to 33% of the soybean [Glycine max (L.) Merr.] growing area and 90% of the wheat (Tritucum aestivum L.) growing area of this country. A soybean?wheat succession with fallow between crops is used in about 11% of the cultivated area. No study has quantified CO2 fluxes in annual soybean?wheat succession in this region. Hence, this study analyzed the seasonality of CO2 exchange (net ecosystem exchange [NEE]) in a 2015/2016 wheat?soybean succession in a commercial farm located in Carazinho, Rio Grande do Sul State, Brazil. The eddy covariance method was used to estimate the annual C balance of this system. The NEE was partitioned between gross primary productivity and ecosystem respiration to understand the dynamics of these fluxes during a year of wheat?soybean succession. Considering the net ecosystem balance between photosynthesis and respiration during the growing season, both soybean and wheat absorbed CO2 from the atmosphere (NEE wheat: ?347 ± 4 g C m?2; NEE soybean: ?242 ± 3 g C m?2). The fallow periods between growing seasons, however, acted as a source of 156 ± 2 g C m?2, reducing the C absorbed by the crops by 27%. For 1 yr, the net biome productivity was ?50 g C m?2 yr?1. The results obtained here demonstrate that the wheat?soybean succession was a net C sink under these specific climatic conditions and field management practices and that the long fallow period between crops limited the agroecosystem from becoming a mo... Mostrar Tudo
Palavras-Chave:  Sucessão soja-trigo.
Thesagro:  Cultivo Anual; Manejo do Solo; Pousio; Respiração do Solo; Soja; Trigo.
Categoria do assunto:  --
Marc:  Mostrar Marc Completo
Registro original:  Embrapa Trigo (CNPT)
Biblioteca ID Origem Tipo/Formato Classificação Cutter Registro Volume Status
CNPT45396 - 1UPCAP - DD
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