IV. Seed quality control factors

IV. Seed quality control factors

    1. Seed moisture
    • The seed moisture affects seed storability.
    • Seeds with low moisture store longer and remain free from insect pests.
    2. Germination per cent
    • Seeds are sown to provide next generation crops.
    • Germination percentage thus, indicates the potential of seeds for developing and establishing into seedlings in the nursery bed (open or polythene) or in the main field.
    • This attribute is given as germination per cent.
    • The combination of pure seed percent and germination per cent is called as Pure Live Seed (PLS) having better viability.
    3. Vigour
    • It indicates the ability of seed to emerge in varying environments or micro-climate of fields where it is grown.
    • It is generally believed, but not always true, that high germination percentage is associated with high seed vigour.
    4. Storage life
    • Seed moisture content is the most important factor influencing loss of viability during storage.
    • Most of the vegetable seeds which are costly are packed in suitable moisture vapour proof attractive containers and are not or least affected in storage or in transit but the seeds of some large sized seeds e.g. garden pea, beans etc. are packed in porous containers, hence the seed moisture content fluctuates with the change in relative humidity of the atmosphere.
    5. Seed health
    • Vegetable seed should be free from seed borne diseases and insects infestation. Insect infestation normally destroys the embryos thus making the seeds unfit for sowing. Similarly most of the virus and bacterial diseases are seed borne.
    • They are not only contaminate the crop but also help in spreading the disease fast.
    • Hence, seeds must be free from pest and disease and treated with pesticide/fungicide to prevent contamination and spread.
    6. Mechanism of control
    • The generally accepted system of seed certification involves inspections, sample testing, also enforcement of minimum standards which constitute the mechanism of quality control in seed.

Last modified: Wednesday, 20 June 2012, 5:35 AM