ABSTRACT
The study was conducted to assess the variables of sunflower production, subjected to irrigation with saline water and nitrogen fertilization. The experiment was conducted in a greenhouse at the Federal University of Campina Grande, from April to July 2012 in a completely randomized design using the 5 x 5 factorial scheme, related to salinity levels of irrigation water expressed by electrical conductivity of 0.7, 1.7, 2.7, 3.7 and 4.7 dS m-1 at 25 oC and nitrogen levels: 50, 75, 100, 125 and 150 mg kg-1, with three replications, totaling 75 experimental units. The total number of achenes, production of achene, percentage of viable achenes, percentage of biomass of viable achenes, the chapter biomass, dry weight of 1000 seeds, dry weight of shoot and root were evaluated. The salinity of water affected the production of achenes, the total number of achenes, percentage of number of viable achenes, percentage of biomass of viable achenes, the biomass of chapter, biomass of 1000 seeds, dry weight of shoot and root, regardless of the dose of nitrogen used. The sunflower cv. EMBRAPA 122-V2000 was affected by salinity of water, as well as by nitrogen fertilization, though there was no significant effect of their interaction. The increasing rates of nitrogen caused a linear increase in achene production, total number of achenes, the biomass and dry biomass of chapter and root.
Key words:
productivity; Hellianthus annus L.; marginal water