Desempenho de cultivares de girassol sob diferentes lâminas de irrigação no Vale do Curu, CE

Abstract

Resumo - Palavras-chave -Helianthus annus. Déficit hídrico. Características agronômicas. Genótipos.Abstract -With the objective to value the influence of six levels of irrigation in the agricultural performance of two cultivars of sunflower, (Catissol 01 e Embrapa 122 V-2000), was made an experiment at the Experimental Farm, Valley of Curu River,county of Pentecoste, CE. The experimental design adopted was randomized blocks with divided plots, with four replicates. The effect of six levels of irrigation based on percentage of evaporation of class A pan (ECA) by the factors 0.25; 0.50; 0.75; 1.00; 1.25 and 1.50 , was evaluated for the cultivars. The variables, diameter of head, mass of 1000 achenes, potential of production of achenes, content of oil of the achenes, potential of production of oil,were determined. The greater values were achieved by the cultivar "Catissol 01", except for the content of oil of the achenes,higher for the "Embrapa 122 V-2000". There were significant differences between the cultivars in the variable diameter of head and potential production of achenes. The level of irrigation of 533.70 mm (150% of ECA) proportioned the greater potential production of achenes that was of 4,222.76 and 3,948.02 kg ha -1 , and of oil 1,851.55 and 1,760.63 kg ha -1 to the cultivars Catissol 01 e Embrapa 122 V-2000, respectively.

Irrigation with domestic treated sewage and nitrogen fertilizing in sunflower cultivation

“…The greatest average mass of a thousand achenes (M1000A) on irrigated sunflower with groundwater well were obtained with treatment D4. As for irrigation with sewage M1000A major averages were obtained with depth D3 corroborating with research by SILVA et al (2011) that also observed significant effects on the M1000A due different irrigation depths.…”

Características agronômicas e o estado nutricional de cultivares de girassol irrigado

“…Silva et al (2011) obtiverem produtividade média de 4.085 kg ha -1 com aplicação diária de lâmina de irrigação, correspondente a 150% da evapotranspiração do tanque classe A.…”

“…Apesar do girassol ser tipicamente cultivado em safrinha (Castro & Oliveira, 2005;Silva et al, 2007) e apontado como tolerante à deficiência hídrica (Castro & Farias, 2005;Toureiro et al, 2007), esta espécie responde positivamente à irrigação (Silva et al, 2009;Silva et al, 2011 …”

Aspectos Morfofisiológicos Do Girassol Irrigado Por Gotejamento No Submédio São Francisco

“…Esses resultados foram inferiores aos encontrados por Silva et al (2011), trabalhando com duas cultivares de girassol, onde foram verificados teores de 45% (Embrapa 122 V-2000) e 43% (Catissol 01). Pivetta et al (2012), avaliando seis híbridos de girassol, observaram que o híbrido com menor teor de óleo apresentou 35%.…”

“…Dentre as variáveis avaliadas, a massa de mil aquênios (VIANA et al, 2012), produtividade e teor de óleo (SILVA et al, 2007), diâmetro do caule e altura das plantas (SILVA et al, 2007; tem sido comumente utilizados na avaliação do cultivo de girassol. Silva et al (2011) definiram lâminas que proporcionaram maiores produção de aquênios e teores de óleo em diferentes variedades de girassol.…”