Generation System of Seed Multiplication | Class of seed

Generation system of seed multiplication 

Generation system of seed multiplication is nothing but the production of a particular class of seed from specific class of seed up to certified seed stage. The choice of a proper seed multiplication model is the key to further success of a seed programme. This basically depends upon 

•  The rate of genetic deterioration 
•  Seed multiplication ratio and 
•  Total seed demand 

Based on these factors different seed multiplication models may be derived for each crop and the seed multiplication agency should decide how quickly the farmers can be supplied with the seed of newly released varieties, after the nucleus seed stock has been handed over to the concerned agency, so that it may replace the old varieties. In view of the basic factors, the chain of seed multiplication models could be., 

a. Three - Generation model  

•  Breeder seed - Foundation seed - Certified seed 

b. Four   - Generation model 

•  Breeder seed - Foundation seed (I) Foundation seed (II) - Certified seed 

c. Five   - Generation model  

• Breeder seed - Foundation seed (I)- Foundation seed (II) -Certified seed (I) - Certified seed (II) 

For most of the often cross pollinated and cross pollinated crops 3 & 4 generation models is usually suggested for seed multiplication. Ex: Castor, Redgram, Jute, Greengram, Rape, Mustard, Sesame, Sunflower and most of the vegetable crops.