1. THE SAMPLING APPROACH IN SLOVENIA
2nd Joint Workshop on Pesticide Indicators,
Istanbul (Turkey), September 13 – 14, 2007
Katja Rutar, Enisa Lojović Hadžihasanović, Simona Dernulc Statistical Office of the Republic of Slovenia

2. SAMPLING IN AGRICULTURE SLOVENIA
Stratification is based on the data of different agricultural products due to mixed type of agricultural production
At least 1 species of animals is bred at 87% of agricultural holdings
Arable land is cultivated by 93% of agricultural holdings
Type of farming according to FSS 2005
49 % of farms have mixed type of farming
35 % of farms are specialized in livestock rearing and milk production
16 % of farms are spcialized in arable and permanent crop production

3. CRITERIA FOR STRATIFICATION
Stratum1
Stratum2
Stratum3
Stratum4
UAA (are)
2000 or more
800-<2000
500 - <800 
 <500
Arable land and wheat (are)
>= 600 and >= 250
300 - < 600 and 100 – < 250
100 - < 300 and 50 - < 100
< 100 and < 50 
Extensive orchards (No of trees)
>= 150
100 - < 150
50 - < 100
< 50 
Vineyards (are)
>= 500
300 - < 500
100 - < 300 
< 100 
Orchards plantations (are)
>= 200
100 - < 200
< 50
Potatoes (are)
>= 100
25 - < 50
< 25
Hops (are)
<100 
Sugar beet (are)
Cattle, total (No)
>= 40
15 – 39
5 - 14 
1 – 4
Pigs, total (No)
20 – 39
4 - 19 
1 – 3
Sheep and goats, breeding animals (No)
>= 30
20 – 29
10 – 19
1 – 9
Broilers (No)
>= 1000
100 – 999
50 – 99
1 – 49
Laying hens (No)
Other poultry (No)
Horses (No)
>= 20
5 – 9
Deer (No)
Quail (No)
Rabbits (No)
>= 75
50 – 74
1 – 24
Ostriches (No)
5 - 9
Behives (No)
>= 50

4. NUMBER OF FARMS IN THE SAMPLIG FARME AND SAMPLE BY STRATA, FSS 2005
Sampling frame
Sample
number
share (%)
Stratum 1
7003
7,8 %
41,2 %
Stratum 2
19337
21,6 %
2339
13,8 %
Stratum 3
30481
34,0 %
3686
21,7 %
Stratum 4
32838
36,6 %
3972
23,4 %
Total
89659
100,0 %
17000

5. WHEAT Share of farms growing wheat Share of area of wheat Stratum1 12%
40 %
Stratum2
27%
30%
Stratum3
41%
25%
Stratum4
20% 6%

6. Coefficient of Variation
ACCURACY OF DATA, FSS 2005
Coefficient of Variation
Area of wheat
0.9%
Area of cereals
0.7%
Arable land, total
Utilized arable area, total
0.8%

7. SAMPLE FRAME and SIZE for the PESTICIDE INDICATORS SURVEY
In the FSS sample we have around 5300 farms cultivating wheat, representing around farms cultivating wheat in the country
On the basis of FSS 2007 data for (only) area of arable land and wheat production four new stratum were defined
From that frame we selected a stratified random sample (4 stratum * 12 NUTS3 regions) of 2900 farms cultivating wheat
All enterprises cultivating wheat will be included in the sample (around 100)

8. DATA COLLECTION METHODS for the PESTICIDE INDICATORS SURVEY
One of (national) aims of the Pesticide indicators survey is to test appropriatenes of different modes of data collection for the survey about pesticide use
On the basis of available resources we will devide the sample of 2900 farms in:
Paper assisted personal interviewing (PAPI) ~ stratified sample of around 200 farms
Postal surveys (POST) ~ stratified sample of around 1350 farms
Computer assisted telefon interviewing (CATI) ~ stratified sample of around1350 farms

9. IDEAL ACCURACY OF DATA for WHEAT PRODUCTION
Total wheat production in ha : CV ~ 2,3%
Wheat production in ha in:
Stratum1 : n ~ 1300 ; CV ~ 4,6%
Stratum2 : n ~ 750 ; CV ~ 5,3%
Stratum3 : n ~ 530 ; CV ~ 5,5%
Stratum4 : n ~ 320 ; CV ~ 6,6%
Face-to-face data collection : n ~ 200 ; CV ~ 10,1%
CATI data collection : n ~ 1350 ; CV ~ 4,4%
POST data collection : n ~ 1350 ; CV ~ 3,5%