The Influence Of Priming Two Cucumber Cultivar Seeds

J. Duhok Univ. Vol.13, No.1, (Agri. And Vet. Sciences) Pp 82-89, 2010
have advantages and disadvantages, as shown
below. Turbidity is usually measured in
nephelometric turbidity units (NTU) or Jackson
turbidity units (JTLJ), depending on the method
used for measurement. The two units roughly
equal (Jamie and Richard, 1996). Although
measuring turbidity is easer than measuring
suspended solid, more information is needed on
their relation. While a relationship can be
established between turbidity and suspended
sediment, this relationship can and will change
spatially and temporally due to variations in
sediment composition and stream energy
(Rasmussen, 1995).
The study was started depended on the
collected data of turbid runoff suspended water
samples from Duhok Dam watershed river
before it arrives into the reservoir, after each
heavy rainfall which, cause runoff to ward the
Rainfall data during study period was taken from
Duhok Dam meteorology stations (Table 1). To
prepare the standard curve three mixed samples
of soil were taken from seven different sites
along the Duhok Dam watershed, and the soil
samples approximately represented the condition
of watershed soil.
The standard curve of the runoff
concentration and water turbidity is the first step
to measure total suspended sedimentation of
Duhok Dam reservoir. Oven- dried mixed soil
samples were taken for each sites as( 1.25,
2.50, 3.75, 5.00 and 7.50 g ),then add (1 liter )
water to prepar the standard concentration . The
weight convert to (Kg soil / m 3 ) (Hollidy, at el
2003)Turbidity values taken from all samples
.(Table 2),(Fig.2) show the relation between
turbidity water suspention (NTU) by using the
(HACH-2100A) Turbidity meter and prepared
suspention consentration (Kg / m 3 ), Correlation
equation was obtained and depended upon to
measure the concentration of suspention real
runoff water during the study periods .
Total rainfall was 385.9mm during study
season .In this study we chose only (11)
rainstorms which really caused runoff ,which
renged between (12mm) and (44mm) as shown
in (Table 3) (Clumian 2). Turbidity measurment
was done for the above (11) water sampls which
were taken from the season flow runoff to
Duhok river.
Table (4)show the total monthly runoff
collected in Duhok Dam during the study
seasonal period. The data has been taken from
Duhok/Iraq dam directory .
28
Table (1 ): The chosen rainfall days and their date in
Duhok Dam meteorology station.
# Date Rainfall (mm)
1 24/10/2008 12.5
2 28/11/208 19.0
3 29/11/2008 35.0
4 24/12/2008 24.5
5 31/12/2008 44.0
6 27/2/2009 25.5
7 28/2/2009 15.5
8 4/3/2009 10.5
9 23/3/2009 30.5
10 24/3/2009 24.0
11 17/4/2009 32.0
Table (2): Relation between soil suspension
concentration and turbidity meter reading
of standard curve.
Kg/m 3 Concentration
of Suspended
8
NTU(nephelometric
turbidity Unit)
1.25 97
2.50 125
3.75 135
5.00 180
7.50 200
6
4
Soil suspension Km/m 3
2
50
0
0
250
200
150
100
y = 86.15x 0.414
R 2 = 0.9544
Fig.(2):Standard curve, shows relation between soil
suspension concentration and turbidity value
Turbidity NUT