The concerned study determined the effects of foliar application of nitrogen fertilizer – urea (N 46%) levels (0, 5, 10, and 15 gm L^-1) and seaweed extract (0, 2, 4, and 6 ml L^-1) on the vegetative growth and yield traits of pea (Pisum sativum L.), carried out in autumn of 2022 in Babylon Province, Iraq. The results indicated significant superiority of the seaweed treatment (6 ml L^-1) in enhancing the pea’s vegetative growth and yield. The seaweed treatment of 6 ml L^-1 provided the highest averages for plant height (57.60 cm), branches per plant (12.58), leaves per plant (26.88), leaf area (925.83 cm²), chlorophyll content (47.95 SPAD), vegetative dry weight (49.68 g), pods per plant (13.83), pod weight (14.10 g), pod yield per plant (196.90 g), and seeds protein (22.15%) compared with lowest values obtained in the control treatment. The foliar application of urea (15 gm L^-1) followed the seaweed and showed the second-highest averages for the above parameters (56.10 cm, 12.08, 25.77, 888.10 cm^-2, 46.20 SPAD, 48.23 g, 12.93, 14.08 g, 184.31 g, and 21.45%, respectively). The interaction of seaweed (6 ml L^-1) and nitrogen fertilizer (15 gm L^-1) was superior, with the highest averages for the said traits.

Keywords: Pea (Pisum sativum L.), seaweed extract, urea fertilizer, foliar fertilization, vegetative growth, yield traits, chlorophyll and protein content

Key findings: The foliar application seaweed extract and urea fertilizer, individually and in combination, performed better for the growth, morphological, yield, and biochemical traits.