This study was conducted in the greenhouses of Fallujah University - Biotechnology and Environmental Center. During planting season (2021-2022), to determine the effect of three zinc concentrations (0, 8, 16) mg L-1 and three soaking periods (6, 12, 18) hours, on the growth and yield characteristics of the cucumber (queen variety). It was implemented as a factorial experiment with randomized complete block design (RCBD) and with three replicates, the results are summed up as follows: The concentrations of 8 and 16 mg L-1 of zinc were achieved by giving the highest average plant height (127.26 cm) and (130.56 cm), leaf area (3934 cm2) and (4582 cm2) plant-1, as well as the fruit length accorded 15.46 and 15.62 cm, respectively, and the plant yield reached 1.16 and 1.74 kg plant-1, respectively. Also, the concentration of 16 mg L-1 of zinc in yield per area (m2) reached 13.91 kg m2 was superior to the concentration of 8 mg L-1 zinc (9.26) kg m2, which was superior to the control (7.85) kg m2. As for the soaking periods, the 18-hour soaking period grants the highest average of plant height, leaf area, plant yield, and yield per area (m2), reaching 131.41 cm, 4385 cm2 plant-1, 1.45 kg plant-1, and 11.55 kg m2, respectively. While the 12-hour soaking treatment gave the highest average fruit length of 15.724 cm over the 18-hour soaking treatment, and it excelled the 6-hour soaking treatment in all studied characteristics except for the fruit diameter, which was not significant for all treatments used. The binary interaction between soaking at a concentration of 16 mg L-1 of zinc with a soaking period of 18 hours gave the highest average plant height, fruit length, plant yield and yield per area (m2) accorded 143.63 cm, 15.89 cm, 1.98 kg plant-1 and 15.82 kg m2, respectively. The effect of interference was non-significant for the mean of leaf area of the plant as well as the diameter of the fruit.
The study was conducted in the Department of biology - College of Education for Girls - University of Anbar in order to study the effect of cadmium and lead pollution and nitrogen fertilizer sources on the accumulation of heavy metals in the root, the vegetative part, yield and its components of barley (Hordeum vulgare L.) during growing season 2020-2021, Where the experiment was carried out in pots containing 20 kg of soil. The experiment was designed according to a randomized complete block design and in the order of factorial experiments with three replications. The experiment included two factors, the first factor is three concentrations of the elements lead and cadmium (0, 40, 80 mg liter -1), and the second factor is three types of nitrogen fertilizer sources are (ammonium sulfate (NH4)2SO4, ammonium nitrate NH4NO3 and urea CO(NH2)2). The experiment was planted and irrigated with the three nitrogen fertilizer sources on 1/11/2020. After 14 days of planting, heavy metals were added to the soil in the above-mentioned concentrations in the form of two batches. The weight of 1000 grains/g and the concentration of heavy elements (Pb, Cd) in the root, vegetative and grains after harvest were calculated. The results of the study showed: The barley plant had the ability to accumulate heavy elements in the different parts of the plant, and their concentration in the root system was the highest, then the vegetative system, then the grain. However, the accumulated amounts of lead were less than cadmium in the roots, as the highest concentrations of lead and cadmium in the roots were (24.78 and 37.22 mg kg-1) and (61.13 and 92.3 mg kg-1). for the concentrations (40 and 80 mg L-1) respectively.
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