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Fluid restriction is the main obstacle in agricultural semiarid region, predominating shallow soils, low fertility and moisture retention, where the sunflower crop emerges as alternative income generation. The objectives evaluate the physiological behavior through gas exchange the cultivated sunflower with irrigation levels and potassium fertilization. The research was conducted in protected cultivation. We used the statistical Doutorando, UEAg/ CTRN/UFCG, CEP 58429-140, Campina Grande-PB, Fone: (083) 99123911, E mail:alberto_agronomo@hotmail.com, Prof. Doutor, Depto de Engenharia Agrícola, UFCG, Campina Grande, PB. 3 Acadêmico de Engenharia Agronômica, UAGRA /CCTA/UFCG, Pombal, PB. 4 Acadêmico de Engenharia Agrícola/CTRN/UFCG, CEP 58429-140, Campina Grande-PB. III INOVAGRI International Meeting, 2015 205 design of randomized blocks, treatments resulted in a factorial 5 x 5, the first factor was studied irrigation levels (40, 60, 80 100 e 120% the real evapotranspiration ETr) and second doses of potassium fertilization (50, 75, 100, 125 e 150% recommending 150 mg K. kg soil), ETr was calculated by drainage lysimeter. At 60 days after sowing, the grain filling stage were measured net photosynthesis (A), stomatal conductance (gs), transpiration (E), internal concentration of CO2 (Ci) and the instantaneous efficiency of water use (EiUA = A/E). The water deficit caused by the blade 40% significantly reduced photosynthesis by 66%, the highest values of photosynthesis and instantaneous efficiency of water use were 17,181 μmol de CO2 m -2 s and 6,00 μmol m s/mmol H2O m -2 s with the blade 120%. Potassium fertilization did not change in gas Sunflower exchanges during the grain filling stage.

TROCAS GASOSAS DO GIRASSOL SUBMETIDO A ESTRESSE HÍDRICO E ADUBAÇÃO POTÁSSICA