Seed Storage,Principles,Stages & Factors

1. SEED STORAGE;
GENERAL PRINCIPLES,STAGES & FACTORS
AFFECTING SEED LONGEVITY DURING
STORAGE
PRESENTED BY:-
Sudhansu Sekhar Barik-033
Bismoy Mohanty-034
Amlanjyoti Khuntia-035
Prachi Pratyasa Deo-036
Samprati Patra-037
PRESENTED TO:-
Ms. Mandakini Kabi
Asst. Professor
Sri Sri University
Cuttack

2. LIST OF TABLES:-
 What is seed storage?
 Stages of Seed Storage.
 Storage Categories.
 Objective.
 Purpose
 Types.
 General Principles of Seed Storage.
 Factors influencing Seed Longevity.
 References.

3. WHAT IS SEED STORAGE ?
 Seed storage is preservation of seed with initial
quality until it is needed for planting.
 The ability of seed to tolerate moisture loss allows
the seed to maintain the viability in dry state.
 After harvesting the seeds are either stored in ware
houses or in transit or in retail shops.
 Storage starts in the mother plant itself when it
attains physiological maturity.

4.  The entire storage period can be conveniently divided
into following stages.
 Storage on plants (physiological maturity until
harvest).
 Harvest, until processed and stored in a warehouse.
 In - storage ( warehouses)
 In transit (Railway wagons, trucks, carts, railway sheds
etc.).
 In retail stores.
 On the user's farm.

5. The seeds are considered to be in
storage from the moment they reach
physiological maturity until they
germinate or until they are thrown
away because they are dead or
otherwise worthless

6. STORAGE CATEGORIES:-
 Orthodox Seed-Water can be removed safely >
90% seeds are orthodox
 Intermediate Seed-Some Water can be removed
 Recalcitrant Seed-Water Removal is lethal (Tropical
Fruit seed can tend to be recalcitrant)

7. OBJECTIVE OF SEED STORAGE:-
 To maintain initial seed quality viz., germination,
physical purity, vigour etc., all along the storage
period by providing suitable or even better
conditions.
 Since the main objective of seed storage is
maintenance of an acceptable capacity for
germination and emergence, it can only be
accomplished by reducing rate of deterioration to
the degree required to maintain an acceptable level
of quality for the desired period.

8.  Storage is needed to maintain the seed in good
physical and physiological condition from the
time they are harvested until the time they are
planted.
 The unsold seed are carried over in storage for
marketing during the second planting season.
 Some kinds of seed are stored for extended
periods to improve the percentage and rapidity
of germination by providing enough time for a
natural release from dormancy.

9. TYPES OF SEED STORAGE
1. Storage at ambient temperature and humidity
2. Dry storage with control of moisture content
but not temperature
3. Dry storage with control of both moisture
content and temperature
4. Dry storage for long-term gene conservation
5. Moist storage without control of moisture
content of temperature
6. Moist cold storage, with control of temperature
7. Cryopreservation

10. The types of storage needed can be
related to the time of storage expected.
Broadly this can be classified into 4 types
a) Storage of commercial truthfully labelled
& certified seed
b) Storage of carry over seeds
c) Storage of foundation seed stocks &
enforcement seed samples
d) Storage of germplasm seeds

11. GENERAL PRINCIPLES OF SEED STORAGE.
1. Seed storage conditions should be dry and cool
2. Effective control of storage pests
3. Proper sanitation in seed stores
4. Before placing seeds into storage they should be
dried to safe moisture limits, appropriate for storage
system.
5. Store only high quality seed i.e. seeds which are
well cleaned, treated, with high germination and
vigour.
6. Determine seed storage needs in view of period or
length of storage time and prevailing climate of the
area during storage period.

12. FACTORS INFLUENCING SEED LONGEVITY
1. Biotic factors-
a. Factors related to seed
 Genetic makeup of seed
 Initial seed quality
 Provenance
 Seed moisture content
b. Other biotic
 Insects
 Fungi
 Rodents
 Mishandling during sampling, testing
2. Abiotic factors-
 Temperature
 Relative humidity
 Seed store sanitation
 Gaseous atmosphere
 Packaging material
 Seed treatment

13. SEED STORAGE STRUCTURES

14. Commercial Bulk Storage Traditional Bag Storage

16. REFERENCES:-
 http://agritech.tnau.ac.in/seed_certification/seed%2
0storage_purpose.html
 http://ecoursesonline.iasri.res.in/mod/page/view.php
?id=17880
 http://sbc.ucdavis.edu/About_US/Seed_Biotechnolo
gies/Seed_Storage_Conservation/
 Seed Technology-R.L Agrawal