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| Seed pelleting and associated technologies | IPPS Conference | Luke Solomon1
IPPS 18th Annual Conference, Saint Ives
Pelleting and associated technologies to enhance seed sowing and germination
1mm
Luke Solomon, Sappi Forests
| Seed pelleting and associated technologies | IPPS Conference | Luke Solomon2
How much seed does Sappi sow?
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2005 2006 2007 2008 2009 2010 2011 2012 2013 2014
Mill
ions o
f seed s
old
EXTERNAL
INTERNAL
| Seed pelleting and associated technologies | IPPS Conference | Luke Solomon3
• 150 seed orchards
• 370 hectares
• 24 species
Seed orchard area
Total seed sales
Acacia Eucalyptus Pinus
Where does Sappi’s seed come from?
| Seed pelleting and associated technologies | IPPS Conference | Luke Solomon4
Where do we sow our seed?
• Sappi seedling nurseries:
• Ngodwana Nursery: 17.5 million
seedlings a year
• (60% eucalypt, 40% pine)
• Richmond Nursery: 16.5 million
seedlings a year
• (close to 100% eucalypt)
• 34 million seedlings annually
Ngodwana
seedling
nursery
Richmond
seedling
nursery
Shaw
Research
Centre
| Seed pelleting and associated technologies | IPPS Conference | Luke Solomon5
How does Sappi sow its seed?
Seed sower Fill trays Remove excess media
DibbleSow seedWater trays
| Seed pelleting and associated technologies | IPPS Conference | Luke Solomon6
How does Sappi sow its seed?
Growth Dispatch
| Seed pelleting and associated technologies | IPPS Conference | Luke Solomon7
What are the challenges of working with seed?1. Variable germination success in the nursery
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% P
red
icte
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iab
le g
erm
ina
tio
n in
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ry
Germination success of 100 batches of E. dunnii
| Seed pelleting and associated technologies | IPPS Conference | Luke Solomon8
1. Variable germination success in the nursery2. Variable speed of germination (seedling vigour)
What are the challenges of working with seed?
| Seed pelleting and associated technologies | IPPS Conference | Luke Solomon9
Pricking-in
What are the challenges of working with seed?1. Variable germination success in the nursery2. Variable speed of germination (seedling vigour)3. Variable distribution of seedlings (small seeds)
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Ca
vitie
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pp
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9 tra
y
Number of seedlings per cavity
Seedling distribution within a single tray
Multiple sowing
| Seed pelleting and associated technologies | IPPS Conference | Luke Solomon10
Pelleting for improved sowing
Pelleting Drying
1 mm
‘Eucalyptus seed is small and irregularly shaped, making it challenging to sow. Pelleting transforms seed into uniform, spherical particles with
increased size by adding inert material around the seed.’
Final Product
| Seed pelleting and associated technologies | IPPS Conference | Luke Solomon11
Time
Pelleting for improved sowing
| Seed pelleting and associated technologies | IPPS Conference | Luke Solomon12
Cav
itie
s p
er
Sap
pi 4
9 t
ray
• Pelleted seed:• Sown 49 pellets per tray• Average 37 seedlings total (75%)• 15 empty cavities to be filled
• Raw seed:• Sown 65 seeds per tray (target 59)• Average 54 seedlings total (83%)• 13 seedlings to be pricked out, 10
empty cavities to be filled (left overs)
Seedlings per cavity
Pelleted SeedRaw Seed
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Pelleting for improved sowing
| Seed pelleting and associated technologies | IPPS Conference | Luke Solomon13
Pelleted Seed Raw Seed
• Pelleted seed – need to prick in from outside tray, raw seed within tray
• Pellets – no oversow, no waste, consistent
• Prime then pellet?
Pelleting for improved sowing
Single seedling
Two seedlings
Three seedlings
Empty cavity
Seedling distribution in tray:
| Seed pelleting and associated technologies | IPPS Conference | Luke Solomon14
Priming for improved germination
‘Priming is the process of controlling the hydration level within
seeds to encourage all seedlings to emerge quickly and simultaneously, thereby improving nursery performance’
| Seed pelleting and associated technologies | IPPS Conference | Luke Solomon15
Time
Priming for improved germination
| Seed pelleting and associated technologies | IPPS Conference | Luke Solomon16
0 1 2
3 4 ‘Germination is associated with emergence of the radicle through the seed coat. Broadly, a germinated seed will develop into a satisfactory plant under favourable conditions’
Priming for improved germination
| Seed pelleting and associated technologies | IPPS Conference | Luke Solomon17
Priming for improved germination
Seed priming has the potential to decrease time required for germination, increase plant uniformity and enhance robustness to germination environment
| Seed pelleting and associated technologies | IPPS Conference | Luke Solomon18
Example: produce 40 million seedlings with:
Gain 14.7%Gain 12.8%Gain 11.7%
Increased gain
What is the impact of improved seed use efficiency?
| Seed pelleting and associated technologies | IPPS Conference | Luke Solomon19
Than
k Yo
u
Sthembiso Khoza- seed sales
Nonkululeko Majola- seed testing
Lelethu Sinuka- CP seed
High quality,
seedsgeneticallyimproved