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Manikan
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Presen
t byV.MANIKANDANV.MANIKANDANB.Tech(B.Tech(Agricultural Engineering))College Of AgriculturalEngineering,
Tamil Nadu Agricultural
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First were developed for cereal seeds in the 1930's by Germains, a British seed
company.
Large scale commercial use of coating began in the 1960's with precision sowing
for the European greenhouse transplant industry.
When California outlawed the short handled hoe in the mid 1970's, the use ofcoated seed for precision field seeders increased.
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Seed coating is a process designedto create a nutritious environment
in the immediate vicinity of thegerminating seed.
This provides a "boost" for the
seedling in its critical early stagesof development.
It was readily accepted by most
users and now has a definite role to
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The six most important reasons why we coat seed are:
l. Pre-inoculation of legumes
2. Nutrient benefits
3. Protection from stress conditions4. To improve ballistic properties and simplify seeding
5. Safe application of agricultural chemicals
6. Protection from rodents, birds and the harmful effects of
some fertilizers.
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Seed coating aims to influence the externalphysical properties of the seed, affecting thesowing characteristics only.
By itself an ideal coating would be neutral in its
influence on the speed.uniformity and percentage of germination when
compared to the original raw seed lot.
The ideal seed coating would perform in the same
manner as the raw seed under a wide range ofenvironmental conditions.
oisture, temperature, pH, soil type
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Multi-coated seeds having two ormore coating layers, with the innermost
coating layer containing a water repellentsuch as a fatty acid or a metal salt thereofin higher concentration than the otherlayer(s).
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The melt coats dissolve when wet and graduallywash away from around the seed.
The melt coats often require more water to washthe coating material away from the seed.
More time for the oxygen to reach the seedthrough the saturated coating material.
Melt coats may offer advantages when soils aresaturated , but oxygen availability alwaysinfluences the speed, uniformity and totalpercentage of germination.
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Split coatingSplit coats initially retain their shape when
wet and , by capillary action, pass moisturethrough the pill to be imbibed by the seed.
The seed swells and cracks the pill byinternal turgor pressure.
The split coat often permits germinationwith less water, as they split, allowuniform, rapid oxygen access to thesurface of the seed.
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Coated seed is a seed unit
covered with any substance whichchanges the size,shape, or weight or the original seed.
Seeds coated with ingredientssuch as, but not limited to. rhizobia.Dyes, And pesticides arc excluded.
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Table Sample sizes of pelleted seed
Determination Submiued samples notless than number ofpellets
Working samples notless than number ofPellets
1. Purity Analysis includingverification ~f species
7500 2500
2. .Weightdetermination 7500 Pure pelletfraction
3. Germination 7500 400
4.Determination of otherseeds
10000 7500
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Diameter 300 mm. This pelleting machine is suitable for the semi
automatic pelleting of small seed lots of flower-, vegetable- and
agricultural seeds.
The machine pellets a seed lot in batches. The seed batches should be
weighed manually and manually be discharged in the pelleting.
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Seed Film Coating Equipment:-
This semi automatic film coating machine is used for treatingsmall quantities of seeds manually.
Using film coating liquids mixed with water and/or fungicides
(or other), the seeds are treated uniformly in this batch system.
The treating time per batch is very short in this rotary film
coating system, which makes it a fast system.
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Virtually any kind of seed can be coated. However Precision Seed Coaters andits sister company Canadian Seed Coaters specialize in the following species:
Canola Alfalfa
Clovers
Trefoil Other
legumes
Bermudagra
Centipede Dichondra
Bluegrass
Fescues Ryegrasses
Bentgrass
Bromegrass Foxtail
Orchardgrass
Timothy Native
grasses
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The most apparent is the visibility of the seeds.The coated seed allows the seed to be seen on the ground, this means a more
even seeding which will lead to a more even bed of colorful blossoms the whole
season long.The coating also helps keep the smaller seeds from seperating from large seeds
during seeding, which again means that the beds will be more uniformthroughout the season.The seed can be spread with a "cyclone" type spreader to make spreading seeds
easier and more uniform.There is no need to mix with sand, sawdust or other material, which will save
time and money.Another advantage is that to the best of our knowledge, the birds will not eat
coated seed.We believe it is the color more so than the taste, birds do not associate the
colored seeds with edible seeds.
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Coated
Lawnseed
Protection of
seedlings
Easy to sow Protection from
wind
Protection from
birds
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Reference
http://www.wikipatents.com/
http://www.patentstorm.us/
http://www.seedinfotech.com/
http://www.wikipatents.com/http://www.patentstorm.us/http://www.seedinfotech.com/http://www.seedinfotech.com/http://www.patentstorm.us/http://www.wikipatents.com/8/14/2019 Seed Testing Methods for Coated Seed (or) Pelleted Seed
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