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Hermetic Storage as a Solution for Prolonged Storage of Seed Presentation to Purdue Hermetic Storage ConferenceApril 10-12, 2012 Accra, Ghana
Rule of Harrington (1972)
“ Life of seed is halved:
a.for each 5o increase in seed storage temperature
b. for each 1% increase in seed moisture content “
“…rice seeds held in airtight storage outlive seeds held in open storage provided they are adequately dried before they are placed in airtight storage …..Rice seeds dried by high heat before sealing were dead after 26 to 28 years, but seeds dried by the sun to 11-13 % MC were stored safely for 30 years”
(Kondo and Okumura, Japan 1930-1932)
STORAGE METHODSMethodology
Plastic material : Polyvinyl chloride
Capacity : 7.5 cu m
Dimension : 2.95x 1.70 x 1.5m
Thickness : 0.80 – 0.85mm
Color : White
Fabrication : HF weldedHermetic storage
BUILDING OF EXPERIMENTAL PILESMethodology
GrainPro Cocoon
Weighing
Bottom section Loading/piling Height capacity
Top section Zipper keys Complete set-up
OXYGEN CONCENTRATIONSalient Findings
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
19.0
20.0
21.0
1 2 3 4 5 6 7 8 9 101112131415161718192021222324252627282930313233343536
Storage durations, weeks
Oxygen concn
etration, %
Cocoon1 Cocoon2 Cocoon3
Salient Findings
TEMPERATURE
10.0
12.0
14.0
16.0
18.0
20.0
22.0
24.0
26.0
28.0
30.0
32.0
34.0
1 2 3 4 5 6 7 8 9101112131415161718192021222324252627282930313233343536
Storage duration, weeks
Tem
pera
ture
, °C
Ambient HS CRS ACRS CTRL
RELATIVE HUMIDITYSalient Findings
40.0
45.0
50.0
55.0
60.0
65.0
70.0
75.0
80.0
85.0
90.0
1 2 3 4 5 6 7 8 9101112131415161718192021222324252627282930313233343536
Storage duration, weeks
Rela
tive h
um
idity, %
Ambient HS CRS ACRS CTRL
SEED GERMINATIONSalient Findings
70.00
75.00
80.00
85.00
90.00
95.00
100.00
Seed g
erm
ination, %
HS 96.16 96.47 93.30 86.15
CRS 96.80 97.57 92.95 89.60
ACRS 94.30 94.75 88.13 85.82
CTRL 92.87 92.92 76.38 74.70
0 Month 3 Months 6 Months 9 Months
SEED VIGORSalient Findings
35.00
40.00
45.00
50.00
55.00
60.00
65.00
70.00
75.00
80.00
85.00
90.00
95.00
100.00
Seed v
igor, %
HS 93.40 66.00 77.92 68.20
CRS 94.05 70.90 75.85 67.55
ACRS 92.75 66.30 68.92 63.95
CTRL 90.98 40.13 38.45 36.43
0 Month 3 Months 6 Months 9 Months
MOISTURE CONTENTSalient Findings
9.00
9.20
9.40
9.60
9.80
10.00
10.20
10.40
10.60
10.80
11.00
Mois
ture
conte
nt, %
HS 10.10 10.92 10.66 10.42
CRS 10.45 10.86 10.60 10.39
ACRS 10.18 9.81 9.91 9.52
CTRL 9.55 9.83 10.21 10.18
0 Month 3 Months 6 Months 9 Months
Summarizing
Under HS conditions germination can be preserved for long time. Longest track record is 14 months
HS performs better than AC storage and almost as good as cold storage
Seed vigor is kept high
Findings of trials with other GrainPro products as SuperGrainbags, GrainSafes show same results as GrainPro Cocoons
Results with maize, sorghum, soybeans are similar
THANK YOU !
GrainPro Inc 200 Baker Ave, Suite 309, Concord MA 01742, USATel.+1-978-371-7118 Fax +1-978-371-7411 [email protected]
GrainPro Philippines Inc : Subic Bay Gateway Park [email protected] Tel.+63-47-2527884 Fax +63-47-2527885
www.grainpro.com
Data: Research By GrainPro, Philrice and Philmec 2006
