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Registro Completo |
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Biblioteca(s): |
Embrapa Algodão; Embrapa Meio-Norte; Embrapa Solos. |
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Data corrente: |
05/05/1998 |
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Data da última atualização: |
11/07/2018 |
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Autoria: |
COELHO, M. A. |
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Título: |
Spatial variability of water related soil physical properties. |
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Ano de publicação: |
1974 |
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Fonte/Imprenta: |
S.l.: University of Arizona, 1974. |
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Páginas: |
97p. |
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Idioma: |
Inglês |
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Notas: |
Ph.D. Thesis. |
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Conteúdo: |
A study of soil variability was performed on an 87 hectare area within a uniform mapping unit-Pima Clay loam at The University of Arizona Branch experiment Station at Marana. The primary interest was with respect to soil water parameters. From 36 sites selected by an unbalanced three-stage nested design, 180 core samples were collected at 30 cm depth intervals to 150 cm. In addition, 500 bulk samples were taken at the 60 cm depth on an equally spaced grid over a secondary sampling area of 96 by 76 meters. The measured parameters showed different patterns of spatial variation. For example, to estimate means within 10% for the 30 cm depth 5, 51, and 1,011 samples would be needed for bul density, the porosity index, and the saturated hydraulic conductivity, respectively (using the 0.05 level of significance). Most of the other estimates for number of samples required were in a range of 50 to 100. Most coefficients of variation were between 10 and 50% with bulk density lower and saturated hydraulic conductivity higher. Variance components for the three stages obtained from the analysis of variance revealed that the variation among fields was smaller than within fields and sections for the majority of the measured parameters, their average relative contribution to the total variance being 25, 44, and 31%, respectively. Values of 15-bar moisture retention corresponding to the 500 bulk samples showed a frequency distribution close to the normal with a slight tendency distribution close to the normal with ................. MenosA study of soil variability was performed on an 87 hectare area within a uniform mapping unit-Pima Clay loam at The University of Arizona Branch experiment Station at Marana. The primary interest was with respect to soil water parameters. From 36 sites selected by an unbalanced three-stage nested design, 180 core samples were collected at 30 cm depth intervals to 150 cm. In addition, 500 bulk samples were taken at the 60 cm depth on an equally spaced grid over a secondary sampling area of 96 by 76 meters. The measured parameters showed different patterns of spatial variation. For example, to estimate means within 10% for the 30 cm depth 5, 51, and 1,011 samples would be needed for bul density, the porosity index, and the saturated hydraulic conductivity, respectively (using the 0.05 level of significance). Most of the other estimates for number of samples required were in a range of 50 to 100. Most coefficients of variation were between 10 and 50% with bulk density lower and saturated hydraulic conductivity higher. Variance components for the three stages obtained from the analysis of variance revealed that the variation among fields was smaller than within fields and sections for the majority of the measured parameters, their average relative contribution to the total variance being 25, 44, and 31%, respectively. Values of 15-bar moisture retention corresponding to the 500 bulk samples showed a frequency distribution close to the normal with a slight tendency distribution c... Mostrar Tudo |
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Palavras-Chave: |
Physic. |
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Thesagro: |
Distribuição de Água; Física; Física do Solo; Solo. |
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Thesaurus Nal: |
soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02050nam a2200205 a 4500
001 1057035
005 2018-07-11
008 1974 bl uuuu m 00u1 u #d
100 1 $aCOELHO, M. A.
245 $aSpatial variability of water related soil physical properties.
260 $aS.l.: University of Arizona$c1974
300 $a97p.
500 $aPh.D. Thesis.
520 $aA study of soil variability was performed on an 87 hectare area within a uniform mapping unit-Pima Clay loam at The University of Arizona Branch experiment Station at Marana. The primary interest was with respect to soil water parameters. From 36 sites selected by an unbalanced three-stage nested design, 180 core samples were collected at 30 cm depth intervals to 150 cm. In addition, 500 bulk samples were taken at the 60 cm depth on an equally spaced grid over a secondary sampling area of 96 by 76 meters. The measured parameters showed different patterns of spatial variation. For example, to estimate means within 10% for the 30 cm depth 5, 51, and 1,011 samples would be needed for bul density, the porosity index, and the saturated hydraulic conductivity, respectively (using the 0.05 level of significance). Most of the other estimates for number of samples required were in a range of 50 to 100. Most coefficients of variation were between 10 and 50% with bulk density lower and saturated hydraulic conductivity higher. Variance components for the three stages obtained from the analysis of variance revealed that the variation among fields was smaller than within fields and sections for the majority of the measured parameters, their average relative contribution to the total variance being 25, 44, and 31%, respectively. Values of 15-bar moisture retention corresponding to the 500 bulk samples showed a frequency distribution close to the normal with a slight tendency distribution close to the normal with .................
650 $asoil
650 $aDistribuição de Água
650 $aFísica
650 $aFísica do Solo
650 $aSolo
653 $aPhysic
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Registro original: |
Embrapa Meio-Norte (CPAMN) |
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Biblioteca |
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Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Trigo. |
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Data corrente: |
16/10/2012 |
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Data da última atualização: |
16/10/2012 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
MEINERZ, G. R.; OLIVO, C. J.; FONTANELI, R. S.; AGNOLIN, C. A.; HORST, T.; DE BEM, C. M. |
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Afiliação: |
GILMAR ROBERTO MEINERZ; CLAIR JORGE OLIVO UFSM, UFSM; RENATO SERENA FONTANELI, CNPT; CARLOS ALBERTO AGNOLIN; TIAGO HORST; CLÁUDIA MARQUES DE BEM. |
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Título: |
Produtividade de cereais de inverno de duplo propósito na depressão central do Rio Grande do Sul. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
Revista Brasileira de Zootecnia, Viçosa, v. 41, n. 4, p. 873-882, 2012. |
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DOI: |
http://dx.doi.org.ez103.periodicos.capes.gov.br/10.1590/S1516-35982012000400007 |
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Idioma: |
Português |
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Palavras-Chave: |
Early growth; Grãos; ILP; Integração lavoura-pecuária; Llivestock-crop production system; Precocidade. |
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Thesagro: |
Forragem. |
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Thesaurus NAL: |
forage; grains. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/68069/1/2012revistabrasileirazootecniav41n4p873.pdf
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Marc: |
LEADER 00920naa a2200289 a 4500
001 1936807
005 2012-10-16
008 2012 bl uuuu u00u1 u #d
024 7 $ahttp://dx.doi.org.ez103.periodicos.capes.gov.br/10.1590/S1516-35982012000400007$2DOI
100 1 $aMEINERZ, G. R.
245 $aProdutividade de cereais de inverno de duplo propósito na depressão central do Rio Grande do Sul.$h[electronic resource]
260 $c2012
650 $aforage
650 $agrains
650 $aForragem
653 $aEarly growth
653 $aGrãos
653 $aILP
653 $aIntegração lavoura-pecuária
653 $aLlivestock-crop production system
653 $aPrecocidade
700 1 $aOLIVO, C. J.
700 1 $aFONTANELI, R. S.
700 1 $aAGNOLIN, C. A.
700 1 $aHORST, T.
700 1 $aDE BEM, C. M.
773 $tRevista Brasileira de Zootecnia, Viçosa$gv. 41, n. 4, p. 873-882, 2012.
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Embrapa Trigo (CNPT) |
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