SEED SAMPLING PRINCIPLES
The reliability of the interface made about the quality of the seed lot
depends primarily on two components: the accuracy with which the sample
represents the lot and the accuracy and precision of the laboratory test.It is
observed in many cases that the variations in test results are due to the
variation in the sampling.Hence seed sampling is one of the basic component
responsible for the accurate Seed Testing results.Therefore utmost care is
required for drawing the sample No matter how accurately the laboratory tests
are done, the results can only show the quality of the sample submitted for
analysis;consequently the sample should accurately represent the composition
of the seed lot.
The object of sampling is to obtain a representative sample of a size
suitable for test.When the sample originates from seed lot,it is expected that
the results reflect the average quality of the seed lot.
A sample is obtained from the seed lot by taking small portions at
random from different position of the lot
It is specified quantity of seed,physically identifiable,in respect of
which a seed test certifiacte can be issued.
Small portion taken from one point in the lot.
Is formed by combining and mixing all primary samples taken from the lot.
Sample submitted to seed testing laboratory .The size of the submitted sample
the Seed Testing Rules.
Is a sub sample taken from Submitted Sample in the laboratory,on which one
of the quality test is made.
General Principles of Sampling
Under seed law enforcement programme only trained and experienced
officials are authorize to undretake sampling and he has to:
Give notice to such intention to the person from whom he intends to take
Take three representative samples in the prescribed manner and mark & seal.
* One sample to be deliver to the person from whom it has been taken
* Second to be sent for analysis to the Seed Analyst of the area.
. Third to be retained for any legal preceedings.
. At least two persons should be present and obtain the signature of
both the witnesses on from VII of the Seed Act:
Following information should be checked on label
iv.Date of Test
case of certified lots sampler should check Information on seed certification
. Name & Address of certification agency
. Kind & Variety
. Lot No.
. Name & address of certifird seed producer
. Date of issue of the certificate & its validity
. Class & Designation of seed
Period during which the seed shall be used for sowing
seed lot should be so arranged that each individual Or part of the lot is
upon the request of the sampler,the owner shall provide full
information regarding bulking and mixing of the lot.When there is definite
evidence of heterogeneity sampling shall be refused.
the nature of the presentation of the seed lot or container makes it
impossible to adequately apply these procedures,then the sampling Shall not be
undertaken,and alternative presentation of the seed lot should be sought.
size of the seed lot should not exceed to the maximum size as prescribed in
the rules subject to 5% of tolerance.
Minimum Sampling Intensity For ssed lots in containers
Containers No. of Primary Samples
1-4 3 samples from each container
5-8 2 samples from each container
9-15 1 samples from each container
16-30 15 samples in total
31-59 20 samples in total
or more 30 samples in total
For seed lots in
containers smaller than 15kg capacity,containers shall be combined to sampling
units not exceeding 100kg and sampling units shall be refarding as containers
in the sampling scheme above.
Equipments for Sampling
Sleeve or Stick type
The tube ans
sleeve have open slots in their walls So that when the tube is turned until
the slots in the tube and sleeve are In line.Seed can flow into the cavity of
the tube,and when the tube is given half turn the opening are close.
Bin tier: It is larger
than sleeve tier constructed on the same principle. It is used for sampling
from heaps and godowns.
Nobe tier: Pointed tube
long enough to reach the center of bag with an oval hole near the pointed end.
Methods for obtaining
in seed Testing Laboratory
Seed samples received in
the seed Testing Laboratory in the seed testing laboratory (submitted sample)
are required to be reduced to obtain working samples for carrying out various
It is simpler
divider,built on the same principle as the conical divider, is the soil
divider. The channels are here arranged in a straight row instead of a circle
as in the conical divider. The soil divider consists of a hopper with attached
channels or ducts , a frame to hold the hopper, two receiving pans and a