Seed Testing Methods for Coated Seed (or) Pelleted Seed

8/14/2019 Seed Testing Methods for Coated Seed (or) Pelleted Seed

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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/


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Seed Testing Methods for Coated Seed (or) Pelleted Seed