Data/hora: 23/09/2024 01:17:43

Biblioteca(s): 	Embrapa Meio-Norte.	
Data corrente: 	27/05/1998	
Data da última atualização: 	27/05/1998	
Autoria: 	ZISKA, L. H.; HALL, A. E.	
Título: 	Soil and plant measurements for determining when to irrigate cowpeas (Vigna unguiculata [L.] Walp.) grown under planned-water-deficits.	
Ano de publicação: 	1983	
Fonte/Imprenta: 	Irrigation Science, v.3, p.247-257, 1983.	
Idioma: 	Inglês	
Conteúdo: 	In a concurrent study we reported that cowpea (Vigna unguiculata [L.] Walp.) had the ability to maintain seed yields when subjected to drought during the vegetative stage provided the subsequent irrigation interval was not too great. A 4 day irrigation interval produced maximum vegetative and seed yields, while an 8 day interval following a vegetative stage drought produced maximum seed yields and water-use-efficiency. Soil and plant measurements were made during flowering and podfilling to develop general methods for scheduling irrigation. Tensiometers provided adequate resolution for maintaining either shoot biomass production or seed yield. Predawn estimates of leaf water potential provided adequate resolution for mmaintaining seed yield but not biomass production. Measurements of percent actual depletion of available soil water or afternoon values for temperature differences between canopy and air divided by the vapor pressure difference gave adequate resolution for maintaining biomass production. However, nominal depletion of available soil water based upon predicted evapotranspiration appears to be the most practical procedure for scheduling irrigation of cowpeas.	
Palavras-Chave: 	Feijao caupi; Manejo de irrigacao; Tensiometria.	
Thesagro: 	Irrigação; Vigna Unguiculata.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Meio-Norte (CPAMN)	
Exemplares: 	CPAMN - (6119-1) - ADC - SP - -- - S 11217 -  - S 11217 - DIS