Abstract
In order to determine the effect of nitrogen levels and spraying with iron and, zinc individually or together on the growth and yield of lettuce plant, a field experiment was conducted in one of the agricultural fields located in the Sufiya area of Ramadi district in Al-Anbar Governorate, on the longitude 29.34- east, latitude 33.22- north and height 48 m above sea level, which is about 1250 m from the right bank of the Euphrates River during the winter season of 2018. The experiment included two factors, the first factor four Levels of nitrogen (50,100,150 and 200 kg N ha-1) and the second factor four Treatments: (0,240 mgL-1 of Fe,120 mgL-1 of Zn and 240 +120 mg. L-1 of Fe+Zn), an experiment was carried out according to the design of the randomized complete block design (RCBD) with three replicates per treatment, results indicated that the level 200 kgN.ha-1 had significant effect in all the characteristics of vegetative growth and its components such as plant height (46.09 cm Plant-1) and leafy area (7460.80 cm2plant-1) and dry weight (200.25 gm plant-1), head diameter (42.54 cm), head circumference (92.22 cm) and number of leaves (55.74 leaves-1), and qualities of the yield and its components as the percentage of the wrap heads (98.57%), marketing yield (62.23 Mg.ha-1) and total product (89.49 Mg ha-1), Foliar application with (240 mg Fe L-1 +120 mg Zn L-1) had significant in all Characteristics of vegetative growth such as plant height (42.59 cm), leafy area (6230.17 cm.Plant-1), dry weight (188.39 gm plant-1), head diameter (39.12 cm), head circumference (86.20 cm), The number of valid papers to eat (32.00 leaf -1) and total number of leaves per plant (50.95 leaf -1) Foliar (240 mg Fe L-1 +120 mgZn L-1) together gave a significant superiority in yield characteristics and components such as percentage of head wrap (96.34%) and marketing yield (49.23 Mg ha-1) and total yield (74.87 Mg ha-1).