Effect of seed rate on vegetative growth and yield properties of two varieties of spinach and weeds
Sonia Hiwa Othman (1); Bakhtyar Abdulla Hamasaaid(2); Soran Othman Abdulla(2)
(1) Department of Horticulture, Faculty of Agricultural Sciences, University of Sulaimani, Kurdistan Region, Iraq.
(2) Department of Plant Protection, Directorate of Research Center in Sulaimani.
Original: 17 May. 2015
Revised:23 July. 2015
Accepted:30 August. 2015
Published online: 20 March. 2016
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 the number
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-2 and leaf number plant-1 by 60.91, 66.56, 57.33, 47.93 and 28.88%
as compared 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 125 DAS 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.