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Registro Completo |
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Biblioteca(s): |
Embrapa Meio-Norte; Embrapa Semiárido; Embrapa Tabuleiros Costeiros. |
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Data corrente: |
09/11/1993 |
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Data da última atualização: |
24/10/2011 |
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Autoria: |
SIVAKUMAR, M. V. K. |
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Título: |
Drought spells and drought frequencies in West Africa. |
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Ano de publicação: |
1991 |
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Fonte/Imprenta: |
Patancheru: ICRISAT, 1991. |
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Páginas: |
181 p. |
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Série: |
(ICRISAT. Research Bulletin, 13). |
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Idioma: |
Inglês |
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Notas: |
Titulo e Texto em Ingles e Frances. |
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Conteúdo: |
Recurring droughts and decreased agricultural productivity during the last two decades in west Africa point to the need for a cleare understanding of the length of dry spells, their frequencies and probabilities. A comprehensive review of various definitions of droughts has been presentes to develop the basis for anlysis of droughts. Using the specific defintion of onset of rains in each year as the sowing date, the length of dry spells were calculated from the historical rainfall data for 150 stations located in Burkina Faso, Mali, Niger, and Senegal. Probability distribution of time to the nextwet day and the percentage frequencies of dry spells were computed for sucessive days after sowing (DAS) a crop. Dry spell analysis showed pronunced drop in the drought risk for cereal crops from the panicle initation phase (20 DAS) to the flowering phase (60 DAS). The relationships between mean annual rainfall and average frequency of dry spells for the selected locations in west Africa showed distinct patterns and permit the prediction of the frequency of dry spells from annual rainfall totals. Applications of the dry spell analysis for the choice of a crop/variety, supplemental irrigation and crop water requirements have been described with examples. |
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Palavras-Chave: |
Agricultural; Agricultural productivity; Drought spells; Dry spells; Efeito; Frequencia; Oeste; Periodo; Periodo seco; West Africa. |
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Thesagro: |
Agricultura; Clima; Produção Agrícola; Seca. |
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Thesaurus Nal: |
Africa; drought; frequency. |
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Categoria do assunto: |
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E Economia e Indústria Agrícola |
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Marc: |
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001 1903856
005 2011-10-24
008 1991 bl uuuu 00u1 u #d
100 1 $aSIVAKUMAR, M. V. K.
245 $aDrought spells and drought frequencies in West Africa.
260 $aPatancheru: ICRISAT$c1991
300 $a181 p.
490 $a(ICRISAT. Research Bulletin, 13).
500 $aTitulo e Texto em Ingles e Frances.
520 $aRecurring droughts and decreased agricultural productivity during the last two decades in west Africa point to the need for a cleare understanding of the length of dry spells, their frequencies and probabilities. A comprehensive review of various definitions of droughts has been presentes to develop the basis for anlysis of droughts. Using the specific defintion of onset of rains in each year as the sowing date, the length of dry spells were calculated from the historical rainfall data for 150 stations located in Burkina Faso, Mali, Niger, and Senegal. Probability distribution of time to the nextwet day and the percentage frequencies of dry spells were computed for sucessive days after sowing (DAS) a crop. Dry spell analysis showed pronunced drop in the drought risk for cereal crops from the panicle initation phase (20 DAS) to the flowering phase (60 DAS). The relationships between mean annual rainfall and average frequency of dry spells for the selected locations in west Africa showed distinct patterns and permit the prediction of the frequency of dry spells from annual rainfall totals. Applications of the dry spell analysis for the choice of a crop/variety, supplemental irrigation and crop water requirements have been described with examples.
650 $aAfrica
650 $adrought
650 $afrequency
650 $aAgricultura
650 $aClima
650 $aProdução Agrícola
650 $aSeca
653 $aAgricultural
653 $aAgricultural productivity
653 $aDrought spells
653 $aDry spells
653 $aEfeito
653 $aFrequencia
653 $aOeste
653 $aPeriodo
653 $aPeriodo seco
653 $aWest Africa
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Registro original: |
Embrapa Meio-Norte (CPAMN) |
