Working sample of seed lot for purity analysis

 
 

Method of preparing a working sample of seed lot for purity analysis

 
Method of collecting primary sample:
 
When seeds are in open seed lot:
 
Amount of seed
Minimum number of sample
50 kg or less than 50 kg
At least 3 primary sample
51 kg to 500 kg
At least 5 primary sample
501 kg to 3000 kg
At least 1 primary sample for each 300 kg of seed, not less than 5
3001 kg to 21000 kg
At least 1 primary sample for each 500 kg of seed not less than 10
 
Samples are collected from different sides and different depth of seed lot.
When seeds are in bags:
 
When a seed lot consist of six bags or less each bag should be sampled from well distributed throughout the bags. When seed lot consists of more than six bags, sample should be taken from 5 bags + 10 % of remaining bags not necessary to sampled more than 30 bags.
 
No. of bags in lots
No. of bags to sample
5
5
6
6
16
7
26
8
 
Mechanical halving device are most used for sub divided and are dependable for providing representive sample. i.e. working sample.
 
The sample divided into two portion both in size and content. The working sample are obtained by dividing the submitted sample are two or several size until the proper weight of working sample are obtained.
 
Crops
Working sample
Rice
100 gm
Wheat
50 gm
Maize
400 gm
Jute
5 – 7 gm

Useful Agricultural Websites

Online Agricultural Study

Food and Agricultural Organization

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