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Biblioteca(s): |
Embrapa Pantanal. |
Data corrente: |
05/02/2001 |
Data da última atualização: |
12/04/2017 |
Autoria: |
FERGUSON, M. W. J. |
Título: |
The application of embryological studies to alligator farming. |
Ano de publicação: |
1981 |
Fonte/Imprenta: |
In: ANNUAL ALLIGATOR PRODUCTION CONFERENCE, 1., 1981, Gainsville. Proceedings. Gainsville: [s.n.], 1981. p.129-156. |
Idioma: |
Inglês |
Palavras-Chave: |
Alligator; Aplicacao; Application; Embryological studies; Estudo embriologico; Farming; Reptile. |
Thesagro: |
Agricultura; Jacaré; Réptil. |
Categoria do assunto: |
-- |
Marc: |
LEADER 00667naa a2200229 a 4500 001 1805099 005 2017-04-12 008 1981 bl --- 0-- u #d 100 1 $aFERGUSON, M. W. J. 245 $aThe application of embryological studies to alligator farming. 260 $c1981 650 $aAgricultura 650 $aJacaré 650 $aRéptil 653 $aAlligator 653 $aAplicacao 653 $aApplication 653 $aEmbryological studies 653 $aEstudo embriologico 653 $aFarming 653 $aReptile 773 $tIn: ANNUAL ALLIGATOR PRODUCTION CONFERENCE, 1., 1981, Gainsville. Proceedings. Gainsville: [s.n.], 1981. p.129-156.
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Registro Completo
Biblioteca(s): |
Embrapa Instrumentação. |
Data corrente: |
23/03/2005 |
Data da última atualização: |
20/06/2018 |
Autoria: |
TOMASELLA, J.; PACHEPSKY, YA.; CRESTANA, S.; RAWLS, W. J. |
Título: |
Comparision of two techniques to develop pedotransfer functions for water retention. |
Ano de publicação: |
2003 |
Fonte/Imprenta: |
Soil science society of America Journal, v. 67. p. 1085-1092, 2003. |
Idioma: |
Inglês |
Conteúdo: |
Two pedotransfer function (PTF) approaches can be used for ob- tainiug the analytical expression of the whole retention curve: (i) soil basic data is used to estimate soil water retention at specific water potentials; and then an analytical expression of the retentlon curve is fitted to the estimated soil moisture values; and (li) soil basic data Is used for estimating the parameters of an analytical expression of water retention curves. The objective of tbis study was to compare the performance of both techniques using data representing the maio Brazilian soils. First, we derived PTFs for the parameters of vau Genuchten equation and for water contents at -6, -10, -33, -100, and -1500 kPa for the same deveiopment data sei. Second, we com- pared the performance of both techniques for the same validation data sei. The approach, based on the estimation of water contents at speclfic water potentiais, provlded better results: for the validation data set, tbis technique showed an average root mean squared error of 0.036 m3 m-3, compared with an averaged error of 0.098 m3 m-3 of the technique based on the direct estlmation of vau Genuchten parameters. A possible explanation for this result mlght be related to the fact that soil moisture Is controlled by different independent variabies at different ranges of soil water potentiai, and those diITer- ences are not directiy reiated to the vau Genuchten parameters. |
Palavras-Chave: |
PTF; Retenção de água. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01945naa a2200181 a 4500 001 1028878 005 2018-06-20 008 2003 bl --- 0-- u #d 100 1 $aTOMASELLA, J. 245 $aComparision of two techniques to develop pedotransfer functions for water retention. 260 $c2003 520 $aTwo pedotransfer function (PTF) approaches can be used for ob- tainiug the analytical expression of the whole retention curve: (i) soil basic data is used to estimate soil water retention at specific water potentials; and then an analytical expression of the retentlon curve is fitted to the estimated soil moisture values; and (li) soil basic data Is used for estimating the parameters of an analytical expression of water retention curves. The objective of tbis study was to compare the performance of both techniques using data representing the maio Brazilian soils. First, we derived PTFs for the parameters of vau Genuchten equation and for water contents at -6, -10, -33, -100, and -1500 kPa for the same deveiopment data sei. Second, we com- pared the performance of both techniques for the same validation data sei. The approach, based on the estimation of water contents at speclfic water potentiais, provlded better results: for the validation data set, tbis technique showed an average root mean squared error of 0.036 m3 m-3, compared with an averaged error of 0.098 m3 m-3 of the technique based on the direct estlmation of vau Genuchten parameters. A possible explanation for this result mlght be related to the fact that soil moisture Is controlled by different independent variabies at different ranges of soil water potentiai, and those diITer- ences are not directiy reiated to the vau Genuchten parameters. 653 $aPTF 653 $aRetenção de água 700 1 $aPACHEPSKY, YA. 700 1 $aCRESTANA, S. 700 1 $aRAWLS, W. J. 773 $tSoil science society of America Journal$gv. 67. p. 1085-1092, 2003.
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