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Registro Completo |
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
22/11/2002 |
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Data da última atualização: |
22/11/2002 |
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Autoria: |
ROOSE, E. J. |
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Título: |
Application of the universal soil loss equation of wischmeier and smith in west Africa. |
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Ano de publicação: |
1977 |
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Fonte/Imprenta: |
In: GREENLAND, D.J.; LAL, R. Soil conservation and management in the humid tropics. Chichester: John Wiley & Sons, 1977. |
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Páginas: |
p. 177-187 |
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ISBN: |
0 471 994731 |
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Idioma: |
Inglês |
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Conteúdo: |
Based on more than 400 plot-year data from erosion plots of nine stations in five West African countries, a critique is made of the Universal Soil Loss Equation in relation to its use in West Africa. Preliminary results from this region suggest that there exists a simple approximate relationship between the annual climatic erosion index R (EI 30) and the mean annual rainfall (H), namely R =1/2H, making it possible to extrapolate the results to compute R. The erosivity increases from the Sahel (R = 100) to the most humid tropical zones, where extremely high values are encountered (R = 1000 to 2000). The vegetal cover is the most important factor in preventing runoff and erosion, regardless of climatic aggressivity, the slope and the soil type. However, culturaltechniques can significantly influence the erosion when the soil is partly covered. The resistance of the soil can be approximately evaluated using the nomograph of Wischmeier, with appropriate adjustment for the gravel contents of the soils, but further evaluation of the topography factors (L and S) is needed. Erosion control techniques (P) involving terracing are both expensive and less efficient than biological control methods, which establish and maintain a vegetal cover by thick and early sowing, correct cultivations, adequate and balanced fertilization, mulching with straw, use of rotations, and buffer strips. Although the Wischmeier equation enables the factors determining erosion in territories in West Africa to be defined, its is not universal ... MenosBased on more than 400 plot-year data from erosion plots of nine stations in five West African countries, a critique is made of the Universal Soil Loss Equation in relation to its use in West Africa. Preliminary results from this region suggest that there exists a simple approximate relationship between the annual climatic erosion index R (EI 30) and the mean annual rainfall (H), namely R =1/2H, making it possible to extrapolate the results to compute R. The erosivity increases from the Sahel (R = 100) to the most humid tropical zones, where extremely high values are encountered (R = 1000 to 2000). The vegetal cover is the most important factor in preventing runoff and erosion, regardless of climatic aggressivity, the slope and the soil type. However, culturaltechniques can significantly influence the erosion when the soil is partly covered. The resistance of the soil can be approximately evaluated using the nomograph of Wischmeier, with appropriate adjustment for the gravel contents of the soils, but further evaluation of the topography factors (L and S) is needed. Erosion control techniques (P) involving terracing are both expensive and less efficient than biological control methods, which establish and maintain a vegetal cover by thick and early sowing, correct cultivations, adequate and balanced fertilization, mulching with straw, use of rotations, and buffer strips. Although the Wischmeier equation enables the factors determining erosion in territories in West Africa to... Mostrar Tudo |
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Palavras-Chave: |
Controle; Solos; Tropico. |
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Thesagro: |
Agricultura; Conservação; Erosão; Manejo. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02169naa a2200217 a 4500
001 1327599
005 2002-11-22
008 1977 bl uuuu u00u1 u #d
100 1 $aROOSE, E. J.
245 $aApplication of the universal soil loss equation of wischmeier and smith in west Africa.
260 $c1977
300 $ap. 177-187
520 $aBased on more than 400 plot-year data from erosion plots of nine stations in five West African countries, a critique is made of the Universal Soil Loss Equation in relation to its use in West Africa. Preliminary results from this region suggest that there exists a simple approximate relationship between the annual climatic erosion index R (EI 30) and the mean annual rainfall (H), namely R =1/2H, making it possible to extrapolate the results to compute R. The erosivity increases from the Sahel (R = 100) to the most humid tropical zones, where extremely high values are encountered (R = 1000 to 2000). The vegetal cover is the most important factor in preventing runoff and erosion, regardless of climatic aggressivity, the slope and the soil type. However, culturaltechniques can significantly influence the erosion when the soil is partly covered. The resistance of the soil can be approximately evaluated using the nomograph of Wischmeier, with appropriate adjustment for the gravel contents of the soils, but further evaluation of the topography factors (L and S) is needed. Erosion control techniques (P) involving terracing are both expensive and less efficient than biological control methods, which establish and maintain a vegetal cover by thick and early sowing, correct cultivations, adequate and balanced fertilization, mulching with straw, use of rotations, and buffer strips. Although the Wischmeier equation enables the factors determining erosion in territories in West Africa to be defined, its is not universal ...
650 $aAgricultura
650 $aConservação
650 $aErosão
650 $aManejo
653 $aControle
653 $aSolos
653 $aTropico
773 $tIn: GREENLAND, D.J.; LAL, R. Soil conservation and management in the humid tropics. Chichester: John Wiley & Sons, 1977.
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Embrapa Solos (CNPS) |
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| Registros recuperados : 3 | |
| 1. |  | BLANCANEAUX, P.; FREITAS, P. L. de; ROOSE, E. Avaliação da capacidade de infiltração sob diferentes condições de manejo do solo na região dos cerrados do Brasil. In: CONGRESSO BRASILEIRO DE CIÊNCIA DO SOLO, 25., 1995, Viçosa, MG. O solo nos grandes domínios morfoclimáticos do Brasil e o desenvolvimento sustentado: resumos expandidos. Viçosa, MG: Sociedade Brasileira de Ciência do Solo, 1995. v. 4, p. 1830-1832.| Biblioteca(s): Embrapa Solos. |
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| 3. | | BLANCHART, E.; ALBRECHT, A.; BROWN, G.; DECAENS, T.; DUBOISSET, A.; LAVELLE, P.; MARIANI, L.; ROOSE, E. Effects of tropical endogeic earthworms on soil erosion. Agriculture, Ecosystems & Environment, v. 104, n. 2, p. 303-315, Oct. 2004. Nome correto do terceiro autor: BROWN, G. G.| Biblioteca(s): Embrapa Soja. |
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| Registros recuperados : 3 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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