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Sonia Hiwa Othman, Bakhtyar Abdulla Hamasaaid , Soran Othman Abdulla
Department of Horticulture, Faculty of Agricultural Sciences, University of Sulaimani, Kurdistan Region, Iraq.
Department of Plant Protection, Directorate of Research Center in Sulaimani.
DOI: https://doi.org/10.17656/jzs.10449
Abstract
An experiment was conducted at the Agricultural Research Station in Bakrajo- Sulaimaniyah, from 7th October, 2013 to 24th March, 2014 to investigate the effect of different seed rates (16, 28, 40 Kg ha-1) on a number of weeds m-2 and their dry weight. Furthermore, some vegetative and yield characters of two spinach varieties (local and Syrian) were measured. The experiment designated in factorial randomized complete block design (RCBD-factorial). Comparisons between the means of the characters were carried out according to Duncan’s Multiple Range Test at the 5 % level. Results revealed that 40kg ha-1 exhibited significant differences in reducing thenumber and dry weight of weeds at both growth stages [100 and 125 days after spinach seed sowing (DAS)] by 67.86 and 75.82% for weed’s number and for weed’s dry weight (67.57 and 48.27%) as compared to 16 kg ha-1. Also 40 kg ha-1 was significantly superior in increasing accumulative yield (kg m-2), Dry weight (g m-2), leaf area (cm2 plant-1),spinach number m-2and leaf number plant-1 by60.91, 66.56, 57.33, 47.93 and 28.88% ascompared to 16 kg ha-1, respectively. The local variety got the highest values in decreasing the number and dry weight of weeds at both growth stages 100 and 125DAS by 43.94 and 51.76% for weed’s number and by 19.46 and 30.49% for weed’s dry weight, compared to the Syrian variety, respectively. The local variety showed significant differences, as compared to Syrian variety, in accumulative yield (kg m-2), dry weight (g m-2), leaf area (cm2 plant-1), spinach number m-2 and leaf number plant-1 by 49.40, 47.06, 38.64, 30.97 and 21.86%, respectively. To sum up, seeding rate of 40 kg ha-1 was best in reducing the number and dry weight of weeds, and it caused significant increases in all studied parameters.
Key Words:
Seed rate Weed, Spinach Local variety Syrian variety.
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