Data/hora: 07/06/2024 08:06:21

Biblioteca(s): | Embrapa Meio-Norte; Embrapa Semiárido; Embrapa Tabuleiros Costeiros.
Data corrente: | 09/11/1993
Data da última atualização: | 24/10/2011
Autoria: | SIVAKUMAR, M. V. K.
Título: | Drought spells and drought frequencies in West Africa.
Ano de publicação: | 1991
Fonte/Imprenta: | Patancheru: ICRISAT, 1991.
Páginas: | 181 p.
Série: | (ICRISAT. Research Bulletin, 13).
Idioma: | Inglês
Notas: | Titulo e Texto em Ingles e Frances.
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.
Palavras-Chave: | Agricultural; Agricultural productivity; Drought spells; Dry spells; Efeito; Frequencia; Oeste; Periodo; Periodo seco; West Africa.
Thesagro: | Agricultura; Clima; Produção Agrícola; Seca.
Thesaurus Nal: | Africa; drought; frequency.

Categoria do assunto:

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E Economia e Indústria Agrícola

Registro original: | Embrapa Meio-Norte (CPAMN)

Exemplares:

CPATSA - (20522-1) - ADP - LV - PP - 551.57730966 - S624d - 1992.00068 - DIS
CPATC - (8932-1) - ADD - LV - -- - 581.182 - S624d - 1992.00008 - DIS
CPAMN - (25860-1) - ADD - LV - PP - 551.5773 - S624d - 1991.00269 - DIS