Published in Scientific Papers. Series A. Agronomy, Vol. LXV, Issue 1
Written by Ioan RADU, Lorena-Roxana GURAU, Ioana FLORESCU, Andrei TEODORU, Constantina CHIRECEANU
Three sunflower hybrids: F708 (H1), HF 7104 (H2) and FD18E41 (H3) were sown at three different sowing dates (SD): 10 March (SD1), 25 March (SD2) and 10 April (SD3) in order to determine the influence of sowing date on the morphological characters and yield components. Research was performed in the field experiments in Tulcea county in 2020 under rainfed conditions. The highest values for head diameter, plant population, 1000-seed weight, seed yield and hectolitre mass were obtained at SD2. Between the hybrids H3 had the highest yield - 2029.67 kg ha-1. At the interaction between sowing date and hybrid the highest no. of leaves/plant was for SD1H2 (17.8) while the great head diameter was for SD2H1 (16.61 cm). H1 and H2 had their high yield at SD2 (2288 kg ha-1 and 1799.3 kg ha-1) while H3 at SD3 (2566.3 ha-1).
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