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Registro Completo |
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
27/05/2010 |
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Data da última atualização: |
18/01/2017 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SOUZA, G. da S. e; GOMES, E. G. |
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Afiliação: |
Geraldo da Silva e Souza, SGE; Eliane Gonçalves Gomes, SGE. |
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Título: |
Probabilistic measures of efficiency and the influence of contextual variables in nonparametric production models: an application to agricultural ressearch in Brazil. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
International Transactions in Operational Research, v. 17, n. 3, p. 351-363, 2010. |
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DOI: |
10.1111/j.1475-3995.2009.00734.x |
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Idioma: |
Inglês |
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Conteúdo: |
In a research institution it is important to identify which management practices have influence on production efficiency. In this paper we assess the statistical significance of contextual variables type, size, financial resources acquisition, intensity of partnerships, processes improvements and management change. The analysis is carried out for the Brazilian Agricultural Research Corporation over the period 1999?2006. The statistical analysis uses a balanced dynamic panel data model. We conclude that only financial resources acquisition is statistically significant. The association with the production process is positive. We also found the two lag inertial components of the conditional FDH to unconditional FDH ratio statistically significant, indicating a 2-year effort to improve efficiency. |
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Thesagro: |
Pesquisa agrícola. |
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Thesaurus Nal: |
Agricultural research. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/44726/1/Probabilistic-measures-of-efficiency2010.pdf
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Marc: |
LEADER 01459naa a2200169 a 4500
001 1853966
005 2017-01-18
008 2010 bl uuuu u00u1 u #d
024 7 $a10.1111/j.1475-3995.2009.00734.x$2DOI
100 1 $aSOUZA, G. da S. e
245 $aProbabilistic measures of efficiency and the influence of contextual variables in nonparametric production models$ban application to agricultural ressearch in Brazil.$h[electronic resource]
260 $c2010
520 $aIn a research institution it is important to identify which management practices have influence on production efficiency. In this paper we assess the statistical significance of contextual variables type, size, financial resources acquisition, intensity of partnerships, processes improvements and management change. The analysis is carried out for the Brazilian Agricultural Research Corporation over the period 1999?2006. The statistical analysis uses a balanced dynamic panel data model. We conclude that only financial resources acquisition is statistically significant. The association with the production process is positive. We also found the two lag inertial components of the conditional FDH to unconditional FDH ratio statistically significant, indicating a 2-year effort to improve efficiency.
650 $aAgricultural research
650 $aPesquisa agrícola
700 1 $aGOMES, E. G.
773 $tInternational Transactions in Operational Research$gv. 17, n. 3, p. 351-363, 2010.
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Registro original: |
Embrapa Unidades Centrais (AI-SEDE) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Algodão. Para informações adicionais entre em contato com cnpa.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Algodão. |
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Data corrente: |
12/02/2022 |
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Data da última atualização: |
05/02/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
SEVERINO, L. S.; MENDES, B. S. da S.; SABOYA, R. de C. C.; BARROS, L. A.; MARINHO, D. R. de F. |
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Afiliação: |
LIV SOARES SEVERINO, CNPA; BRUNA SANTANA DA SILVA MENDES, CNPA; RITA DE CASSIA CUNHA SABOYA, CNPA; LUCIANO ALMEIDA BARROS, UNIVERSIDADE FEDERAL DE CAMPINA GRANDE; DAISE RIBEIRO DE FARIAS MARINHO, CNPA. |
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Título: |
Nutrient content of solvent-extracted castor meal separated in granulometric fractions by dry sieving and applied as organic fertilizer. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Industrial Crops and Products, v. 161, 113178, p. 1-7, 2021. |
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Páginas: |
7 p. |
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ISSN: |
0926-6690 |
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DOI: |
10.1016/j.indcrop.2020.113178 |
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Idioma: |
Inglês |
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Conteúdo: |
Castor meal is the main by-product of the industrial oil extraction of castor seed (Ricinus communis L.). It was observed that castor meal could be separated by sieving into apparently distinct fractions. This study measured the relative weight and the nutrient content of six granulometric fractions of castor meal separated by sieving and tested the hypothesis that the fractions with lower N content have a longer residual effect when used as organic fertilizer. Samples of solvent-extracted castor meal were sieved in meshes with openings varying from 9.5 to 0.11 mm. The relative weight of each fraction was measured and calculated, and the nutrient content was determined. In another experiment, the meal was sieved into only three fractions for being tested as organic fertilizer for cotton (Gossypium hirsutum L.) plants for two consecutive growth cycles without additional organic fertilization. The finest fraction (particles < 0.11 mm) had a relative weight of 3.53 %, and the highest relative weight (32.85 %) was found in the fraction with particles between 1.0 and 2.0 mm. The finer were the particles, the higher was the content of N, P, K, Mg, and S, and the lower was the content of Ca. All the castor meal fractions were effective as organic fertilizer for cotton plants. The only difference among fractions was the nutrient content. The evolution of CO2 by microbial respiration confirmed that all the three fractions of castor meal were completely mineralized within one month. Castor meal fractions had no residual effect for supplying N to cotton plants cultivated in the same soil for the second cycle without additional organic fertilization. MenosCastor meal is the main by-product of the industrial oil extraction of castor seed (Ricinus communis L.). It was observed that castor meal could be separated by sieving into apparently distinct fractions. This study measured the relative weight and the nutrient content of six granulometric fractions of castor meal separated by sieving and tested the hypothesis that the fractions with lower N content have a longer residual effect when used as organic fertilizer. Samples of solvent-extracted castor meal were sieved in meshes with openings varying from 9.5 to 0.11 mm. The relative weight of each fraction was measured and calculated, and the nutrient content was determined. In another experiment, the meal was sieved into only three fractions for being tested as organic fertilizer for cotton (Gossypium hirsutum L.) plants for two consecutive growth cycles without additional organic fertilization. The finest fraction (particles < 0.11 mm) had a relative weight of 3.53 %, and the highest relative weight (32.85 %) was found in the fraction with particles between 1.0 and 2.0 mm. The finer were the particles, the higher was the content of N, P, K, Mg, and S, and the lower was the content of Ca. All the castor meal fractions were effective as organic fertilizer for cotton plants. The only difference among fractions was the nutrient content. The evolution of CO2 by microbial respiration confirmed that all the three fractions of castor meal were completely mineralized within one month. C... Mostrar Tudo |
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Thesagro: |
Efeito Residual; Fertilizante; Gossypium Hirsutum; Mamona; Microbiologia do Solo; Planta Oleaginosa; Ricinus Communis. |
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Thesaurus NAL: |
Castor oil; Microbial activity; Organic fertilizers; Residual effects. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02705naa a2200337 a 4500
001 2139987
005 2023-02-05
008 2021 bl uuuu u00u1 u #d
022 $a0926-6690
024 7 $a10.1016/j.indcrop.2020.113178$2DOI
100 1 $aSEVERINO, L. S.
245 $aNutrient content of solvent-extracted castor meal separated in granulometric fractions by dry sieving and applied as organic fertilizer.$h[electronic resource]
260 $c2021
300 $a7 p.
520 $aCastor meal is the main by-product of the industrial oil extraction of castor seed (Ricinus communis L.). It was observed that castor meal could be separated by sieving into apparently distinct fractions. This study measured the relative weight and the nutrient content of six granulometric fractions of castor meal separated by sieving and tested the hypothesis that the fractions with lower N content have a longer residual effect when used as organic fertilizer. Samples of solvent-extracted castor meal were sieved in meshes with openings varying from 9.5 to 0.11 mm. The relative weight of each fraction was measured and calculated, and the nutrient content was determined. In another experiment, the meal was sieved into only three fractions for being tested as organic fertilizer for cotton (Gossypium hirsutum L.) plants for two consecutive growth cycles without additional organic fertilization. The finest fraction (particles < 0.11 mm) had a relative weight of 3.53 %, and the highest relative weight (32.85 %) was found in the fraction with particles between 1.0 and 2.0 mm. The finer were the particles, the higher was the content of N, P, K, Mg, and S, and the lower was the content of Ca. All the castor meal fractions were effective as organic fertilizer for cotton plants. The only difference among fractions was the nutrient content. The evolution of CO2 by microbial respiration confirmed that all the three fractions of castor meal were completely mineralized within one month. Castor meal fractions had no residual effect for supplying N to cotton plants cultivated in the same soil for the second cycle without additional organic fertilization.
650 $aCastor oil
650 $aMicrobial activity
650 $aOrganic fertilizers
650 $aResidual effects
650 $aEfeito Residual
650 $aFertilizante
650 $aGossypium Hirsutum
650 $aMamona
650 $aMicrobiologia do Solo
650 $aPlanta Oleaginosa
650 $aRicinus Communis
700 1 $aMENDES, B. S. da S.
700 1 $aSABOYA, R. de C. C.
700 1 $aBARROS, L. A.
700 1 $aMARINHO, D. R. de F.
773 $tIndustrial Crops and Products$gv. 161, 113178, p. 1-7, 2021.
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