Jailma Ribeiro de Andrade

Crescimento, desenvolvimento e produção de três cultivares de girassol sob diferentes regimes hídricos

The sunflower is a species with numerous applications, presenting great potential for production in energy replaceable. Although there exist bibliographic citations on the hydric needs and cultivars behavior of sunflower, still information, mainly for the North East of Brazil, is scarce. The objective of this study was to evaluate the growth characteristics, development and production of sunflower cultivars under different water regimes. The experiment was conducted in a completely randomized design in a factorial 3 x 4, comprising three cultivars (BRS Gira 26, Agrobel 962 and Embrapa 122 V-2000) and four irrigation levels (40, 60, 80 and 100% of the field capacity soil water content) with four repetitions. They were evaluated the characteristics: plant height, stem diameter, leaf area, early flowering, physiological maturity, shoot biomass, number achenes and weight of achenes. The replacement of water with 100% of the available water presented more plant height, stem diameter, leaf area, biomass and number and weight of achenes, standing out the Agrobel 962 for most of characteristics. Irrigation depth of 635,5; 603,7 and 546,2 mm, equivalent at 100% the capacity field, provide best answers the growth, development and production cultivars of sunflower BRS Gira 26, Agrobel 962 and Embrapa 122 V-2000, respectively. Crescimento, desenvolvimento e produção de três cultivares de girassol sob diferentes