Agriculture Reference
In-Depth Information
Table 13.18. Factors for additional variation in seed lots to be used for calculating W and inally the
H-value (from Table 2C, International Rules for Seed Testing, ISTA, 2010).
_____________________________________________________________________________________
Attributes Non-chaffy seeds Chaffy seeds
_____________________________________________________________________________________
Purity
1.1
1.2
Other seed count
1.4
2.2
Germination
1.1
1.2
_____________________________________________________________________________________
Table 13.19. Sampling intensity and critical H-values (from Table 2D, International Rules for Seed
Testing, ISTA, 2010).
Number of
containers in
the lot (No)
Number of
independent
container-
samples (N)
Critical H-values
For purity and germination For other seed count
Non-chaffy Chaffy
seeds seeds
Non-chaffy Chaffy
seeds seeds
5
5
2.55
2.77
3.25
5.10
6
6
2.22
2.42
2.83
4.44
7
7
1.98
2.17
2.52
3.98
8
8
1.80
1.97
2.30
3.61
9
9
1.66
1.81
2.11
3.32
10
10
1.55
1.69
1,97
3.10
11-15
11
1.45
1.58
1.85
2.90
16-25
15
1.19
1.31
1.51
2.40
26-35
17
1.10
1.20
1.40
2.20
36-49
18
1.07
1.16
1.36
2.13
50 or more
20
0.99
1.09
1.26
2.00
 
Search WWH ::




Custom Search