SEALNET | Asian Soil Laboratory Network: 3rd meeting. Manila, Philippines, 23 - 27 September 2019. Presenter: Ms. Herawaty

1. The Indonesian Soil Laboratory Network
Lenita Herawaty, MSi
ted at the Third meeting of the Asian Soil Laboratory Network (SEAL
23-27 September 2019, Manila, Philippines
INDONESIAN SOIL RESEARCH INSTITUTE
IAARD, MINISTRY OF AGRICULTURE
http://balittanah.litbang.pertanian.go.id

2. 01 Background
02 National Cross Check Coordinator
03
PT. Coordination
sample preparation, statistic,
technical meeting
OUTLINE

3. Background
Laboratory : Since 1905
- Bogor, Indonesia Dutch colonial history,
Laboratory for Agroecology and ground research.
- Soil, Plant and Fertilizer analysis
 Coordinator of national cross check : 1970
 WEPAL (Wageningen Evaluation Programs for
Analytical laboratories : IPE (Plant) and ISE (soil)
(1970s)

4.  EANET (Acid Deposition Monitoring Network in East
Asia) : Soil (1998s)
 ASPAC (The Australian Soil and Plant Analysis
Council) operates a soil and plant tissue Inter-
Laboratory Proficiency Programmed : Soil (2016)
 SEALNET (South-East Asia Laboratory Network ) :
Soil (2018)
 FFTC (Food and Fertilizer Technology Center) (2018)
Taiwan : Soil, plant and rice grain
Background

5. National Cross Check Coordinator
Since 1970
 Participant : 10 Labs
 Unofficial activities : - QC lab
 Time : 3 round/years
 National Reference Laboratories

6. Accreditation
ISRI’s Laboratory accreditation :
1. -ISO/IEC 17025:2000 since 2005 (No 192-IDN)
- Updated 2014 (No. 864-IDN)
- Adjustment to ISO/IEC 17025 : 2017
• Certificate : LP-846-IDN: National Standardization
Agency of Indonesia
• Scope : Soil, Plant, Fertilizer, Irrigation Water
• 190 parameters
2. ISO /IEC 17043 : 2010 (Proficiency Test Provider)
• Certificate : PUP - 12 – IDN National
• Scope : Soil, Plant, Organic Fertilzer
9 test parameters Soil : pH, Org-C, N ;
Plant tissue : N, P, K OF : pH, Org-C, N

9. 97 Labs
70 Labs
member
PT
22 Labs
accredited
MoA
IAARD Soil
Lab
20 Lab
12 AIAT
accredited
(34 provinces)
21 Private
Labs
8
(2 University
accredited)
7 Research
Center
Accredited
ISRI currently carry out Proficiency Test for 70 Labs for Soil,
Plant Tissue and Organic Fertilizer
Participants

10. PT. Coordination
• Commodities : Soil, Plant and Organic Fertilizer
• Frequency : 1 time per year
SOIL
Texture, pH*, Org-
C*,N*, Av-P, CEC,
Ex-Bases, Ex-
Acidity
PLANT
N*,P*,K*,Ca,
Mg,S,Fe,Al,
Mn,
Cu,Zn,B
Organic
Fertilizer
pH*, Org-C*,
N*, P,K, Fe
Commodities : * (acreditate scope)

11. Sample Preparation

12. Sample Preparation

13. STATISTIC USED
1. Homogeneity Test
MSB (mean square between)
MSW (mean square within)

14. 2. Stability Test
│ Xi – XHM │ < 0.3 x nIQR
3. Homogeneity of PT Results
STATISTIC USED
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
6 37 15 44 52 25 11 53 57 30 9 21 68 5 12 65 28 23 34 8 36
pHtanahH2O
Kode Lab.
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
31 49 35 26 14 21 34 58 59 47 36 17 27 48 29 33 57 20 67 18
C-organik(%)
Kode Lab.

15. Statistic Used
4. Z-Score Robust Statistical Calculation
 ZBi, between laboratories Z-score
Si - median (Si)
IQR (Si) x 0,7413
 Zwi , within laboratory Z-score.
Di - median (Di)
IQR(Di) x 0,7413
ZBi =
Zwi =

16. REPORT
-3
-2
-1
0
1
2
3
6 67 50 15 24 60 52 49 54 11 14 3 57 39 51 9 64 63 68 62 27 12 58 47 28 45 42 34 55 40 36 43
Z-Score of Laboratories
-20
-15
-10
-5
0
5
10
15
20
44 24 59 30 51 9 50 33 49 65 6 13 19 21 28 37 40 46 53 55 61 64 67 7 35 27 68 36 34 25 69 2
Z-Score of Intra Lab

17. Categories
1. Outlier ($$) : -3 > Zwi > 3 (I Zwi I ≥3 )
2. Questionable ($) : 2 < I Z I < 3
3. Competent : Z I < 2

18. Example
No.
Lab.
Code
pH H2O Z-Score
I II ZBi Zwi
1 6 6,00 6,00 -2,42 $ 0,00
2 61 6,10 6,10 -2,07 $ 0,00
3 67 6,12 6,12 -2,00 $ 0,00
4 37 6,20 6,20 -1,72 0,00
5 50 6,20 6,24 -1,65 -1,35
6 70 6,27 6,27 -1,48 0,00
7 15 6,28 6,27 -1,44 0,67
8 29 6,28 6,28 -1,44 0,00
9 24 6,25 6,36 -1,36 -3,71 $$
10 44 6,26 6,50 -1,10 -8,09 $$
n 63
Median 6,70
Q3 6,94
Q1 6,55
nIQR 0,29
CV
Robust
4,29
CV
Horwits
3,00
Max 7,46
Min 6,00

19. TECHNICAL MEETING

20. Thanks for your attention