Search Results - "Carlos Roberto Spehar"

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  1. 1

    Adaptability of quinoa genotypes to altitudes and population densities in Colombia by Anchico, Wilson, Spehar, Carlos Roberto, Vilela, Michelle Souza

    Published in Bioscience journal (01-11-2020)
    “…This work aimed at evaluating and comparing agronomic characteristics of 15 quinoa (Chenopodium quinoa Willd) genotypes cultivated in two altitudes and sowing…”
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    Journal Article
  2. 2

    Ammonia volatilization from enhanced-efficiency urea on no-till maize in brazilian cerrado with improved soil fertility by Cancellier, Eduardo Lopes, Silva, Douglas Ramos Guelfi, Faquin, Valdemar, Gonçalves, Bruno de Almeida, Cancellier, Leandro Lopes, Spehar, Carlos Roberto

    Published in Ciência e agrotecnologia (01-04-2016)
    “…ABSTRACT High nitrogen losses by ammonia volatilization are expected when urea is used as the source of N. The use of controlled-release urea and urease…”
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    Journal Article
  3. 3

    Solubility and availability of micronutrients extracted from silicate agrominerals by Marchi, Giuliano, Guelfi-Silva, Douglas Ramos, Malaquias, Juaci Vitória, Guilherme, Luiz Roberto Guimarães, Spehar, Carlos Roberto, Martins, Eder de Souza

    Published in Pesquisa agropecuaria brasileira (01-01-2020)
    “…The objective of this work was to evaluate the solubility of the micronutrients copper, nickel, and zinc, chemically extracted from silicate agrominerals, as…”
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  4. 4

    Nitrogen loss by volatilization of nitrogen fertilizers applied to coffee orchard by Dominghetti, Anderson William, Guelfi, Douglas Ramos, Guimarães, Rubens José, Caputo, André Luiz Carvalho, Spehar, Carlos Roberto, Faquin, Valdemar

    Published in Ciência e agrotecnologia (01-04-2016)
    “…ABSTRACT Ammonia volatilization (N-NH3) is one of the main pathways of Nitrogen loss reducing nitrogen use efficiency in coffee orchard. This work aimed at…”
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    Journal Article
  5. 5

    Exploiting genotypic variability from low-altitude Brazilian Savannah-adapted Chenopodium quinoa by Spehar, Carlos Roberto, da Silva Rocha, Juliana Evangelista

    Published in Euphytica (01-09-2010)
    “…Saponin-free quinoa genotypes were evaluated in summer and autumn-winter sowings, for phenotypic traits and yield stability. They were obtained by single…”
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  6. 6

    Characterization and nutrient release from silicate rocks and influence on chemical changes in soil by Silva, Douglas Ramos Guelfi, Marchi, Giuliano, Spehar, Carlos Roberto, Guilherme, Luiz Roberto Guimarães, Rein, Thomaz Adolpho, Soares, Danilo Araújo, Ávila, Fabrício William

    Published in Revista Brasileira de Ciência do Solo (01-06-2012)
    “…The expansion of Brazilian agriculture has led to a heavy dependence on imported fertilizers to ensure the supply of the growing food demand. This fact has…”
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  7. 7

    Quinoa (Chenopodium quinoa) reaction to herbicide residue in a brazilian savannah soil by Santos, R.L. de B, Spehar, C.R, Vivaldi, L

    Published in Pesquisa agropecuaria brasileira (01-06-2003)
    “…The quinoa (Chenopodium quinoa Willd.) cultivation, one of the most promising in double cropping with soybeans or maize, depends on weed control. The objective…”
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    Journal Article
  8. 8

    Deveria o Brasil investir em novos grãos para a sua alimentação? A proposta do amaranto (Amaranthus SP) by Amaya-Farfan, Jaime, Marcílio, Roberto, Spehar, Carlos Roberto

    “…O gênero Amaranthus compreende várias espécies de plantas dicotiledôneas cujas folhas e sementes são regularmente consumidas como alimento em diversos países,…”
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  9. 9

    Caracterização agronômica de amaranto para cultivo na entressafra no Cerrado by Teixeira, Danielly Leite, Spehar, Carlos Roberto(Embrapa-Centro de Pesquisa Agropecuária dos Cerrados), Souza, Luiz Augusto Copati

    Published in Pesquisa agropecuaria brasileira (2003)
    “…O objetivo deste trabalho foi caracterizar e avaliar 48 acessos de três espécies de amaranto (Amaranthus caudatus L., A. cruentus L.,e A. hypochondriacus L.)…”
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  10. 10

    Desempenho agronômico de espécies tradicionais e inovadoras da agricultura em semeadura de sucessão e entressafra no cerrado do planalto central brasileiro by Carlos Roberto Spehar, Ronaldo Trecenti

    Published in Bioscience journal (01-02-2011)
    “…Avaliou-se o desempenho agronômico de sorgo, milho, milhetos, aveia preta, trigo, cevada, braquiária, nabo forrageiro, amaranto, quinoa, kenaf, gergelim,…”
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  11. 11

    Agronomic performance of quinoa selected in the Brazilian Savannah by Spehar, C.R, Santos, R.L. de B

    Published in Pesquisa agropecuaria brasileira (01-06-2005)
    “…Twenty six breeding lines, selected from individual plant progenies of hybrids among varieties Amarilla de Marangani, Blanca de Junín, Chewecca, Faro 4,…”
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  12. 12

    Efeito da densidade de semeadura e doses de nitrogênio sobre a produtividade e biometria de amaranto, no cerrado do planalto central by Clarissa Campos Ferreira, Walter Quadros Ribeiro Júnior, Maria Lucrecia Gerosa Ramos, Carlos Roberto Spehar, Thiago Rodrigues Ramos Farias

    Published in Bioscience journal (01-10-2014)
    “…O amaranto é uma granífera com características de crescimento, estabelecimento e produção promissoras e com grande potencial para um aumento do seu cultivo…”
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  13. 13

    Hybridization between progenies and agronomic characterization of the F2 generation in quinoa by Anchico-Jojoa, Wilson, Peixoto, José Ricardo, Spehar, Carlos Roberto

    “…Quinoa is a self-pollinating species with very small flowers, which hinders efficiency in crossbreeding. Therefore, developing an efficient crossbreeding…”
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  14. 14

    Adaptability of quinoa genotypes to altitudes and population densities in Colombia by Wilson Anchico, Carlos Roberto Spehar, Michelle Souza Vilela

    Published in Bioscience journal (01-12-2020)
    “…This work aimed at evaluating and comparing agronomic characteristics of 15 quinoa (Chenopodium quinoa Willd) genotypes cultivated in two altitudes and sowing…”
    Get full text
    Journal Article
  15. 15

    Amaranto BRS Alegria: alternativa para diversificar os sistemas de produção by Spehar, Carlos Roberto, Teixeira, Danielly Leite, Cabezas, Waldo Alejandro Rúben Lara, Erasmo, Eduardo Andrea Lemus

    Published in Pesquisa agropecuaria brasileira (01-05-2003)
    “…A diversificação do sistema produtivo depende de espécies com rápido crescimento, tolerância ao déficit hídrico, produção de biomassa, ciclagem de nutrientes e…”
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  16. 16

    Análise de imagem para determinação do teor de saponina em quinoa by Souza, Luiz Augusto Copati, Spehar, Carlos Roberto(Embrapa Cerrados), Santos, Roberto Lorena Bastos(Embrapa Cerrados)

    Published in Pesquisa agropecuaria brasileira (2004)
    “…Um grupo de sementes lavadas e 35 acessos de quinoa (Chenopodium quinoa Willd) foram avaliados pelo método de coluna de espuma e sua coloração foi decomposta…”
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  17. 17

    Genetic parameters and morpho‐agronomic characterization of barley in the Brazilian Savannah by Monteiro, Vitor Antunes, Amabile, Renato Fernando, Spehar, Carlos Roberto, Faleiro, Fábio Gelape, Vieira, Eduardo Alano, Peixoto, José Ricardo, Ribeiro Junior, Walter Quadros, Leite Montalvão, Ana Paula

    Published in Journal of the Institute of Brewing (01-04-2018)
    “…There is a growing demand for malting barley in the world and the supply relies on introducing the crop into new agricultural regions, such as the Brazilian…”
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  18. 18

    Agronomic efficiency of potassium fertilization in lettuce fertilized with alternative nutrient sources by Guelfi-Silva, Douglas Ramos, Marchi, Giuliano, Spehar, Carlos Roberto, Guilherme, Luiz Roberto Guimarães, Faquin, Valdemar

    Published in Ciência agronômica (01-06-2013)
    “…The aim of this study was to evaluate the effect of alternative sources of nutrients on the nutrition, yield and efficiency of potassium fertilization in…”
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    Quinoa BRS Piabiru: alternativa para diversificar os sistemas de produção de grãos by Spehar, Carlos Roberto(Embrapa-Centro de Pesquisa Agropecuária dos Cerrados), Santos, Roberto Lorena de Barros(Universidade Federal de Goiás Escola de Agronomia)

    Published in Pesquisa agropecuaria brasileira (01-06-2002)
    “…A diversificação da agricultura possibilita implementar a renda, reduzir custos, disponibilizar nutrientes, proteger o solo, reduzir impacto ambiental negativo…”
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