Effects of reduced pesticide use on flora and fauna in agricultural
fields
Appendix E.2. Results from analyses of each field trial in spring barley and winter wheat.
In addition the treatment intensity index, yield at normal dosage and weed density in
spring are listed. Statistical significance of explanatory factors is indicated as
follows: ns: p>0.10, +: 0.05£ p<0.10, *: 0.01£ p<0.05, **: 0.001£ p<0.01 and
***: p<0.001. Notice that non-sprayed plots were not included in the experiments in
1997.
Farm
Year
Treatment intensity index 1
Yield at normal dosage (tons/ha)
Mean density of weed in spring (number/m2)
Effect of block
Effect of weed density
Effect of species richness
Effect of dosage
Differences between dosages (pairwise
tests)
Variation explained by the model (%)
Spring barley
Gjorslev
97
0.45
5.75
120
*
+
ns
+
94
Oremandsgård
97
1.41
6.78
408
+
+
+
*
1/4<1/1
94
Lekkende
97
0.88
6.11
120
*
ns
**
ns
97
Nøbøllegård
97
0.88
5.11
110
ns
ns
ns
ns
84
Nordfeld
97
1.29
7.59
420
ns
ns
ns
ns
72
Gjorslev
98
0.68
7.27
346
*
*
ns
**
0<1/4, 1/2, 1/1
89
Oremandsgård
98
1.32
6.70
179
*
ns
ns
ns
88
Lekkende
98
2.25
7.53
169
**
ns
ns
+
86
Nøbøllegård
98
0.55
6.35
280
***
+
+
***
0<1/4, 1/2, 1/1
97
Nordfeld
98
0.67
6.55
213
ns
*
ns
ns
91
Gjorslev
99
0.37
6.47
760
ns
ns
ns
ns
53
Oremandsgård
99
1.30
5.34
870
*
ns
ns
ns
95
Lekkende
99
1.17
4.23
151
ns
ns
ns
ns
87
Nøbøllegård
99
0.37
6.48
351
+
ns
ns
ns
88
Nordfeld
99
1.01
6.92
55
ns
ns
ns
ns
65
Winter wheat
Gjorslev
972
0.65
9.08
25
*
ns
+
no
89
Oremandsgård
97
1.93
9.10
199
***
**
ns
***
1/4<1/2,1/1
99
Lekkende
97
1.60
8.48
76
ns
ns
ns
no
38
Nordfeld
97
2.28
9.81
190
ns
ns
ns
no
68
Gjorslev
98
1.35
8.17
63
ns
ns
ns
**
0<1/2, 1/ ; 1/4<1/1
86
Oremandsgård
98
1.65
9.64
27
ns
ns
ns
+
88
Lekkende
98
1.14
9.89
13
ns
ns
ns
no
74
Nøbøllegård
982
0.85
9.75
56
ns
ns
+
**
0<1/4, 1/2, 1/1
95
Nordfeld
98
1.85
10.31
282
+
ns
ns
**
0<1/4, 1/1
90
Gjorslev
993
0.33
10.69
53
ns
ns
ns
+
77
Oremandsgård
99
1.48
9.55
71
+
ns
ns
no
76
Lekkende
993
1.00
8.24
78
ns
ns
ns
no
75
Nøbøllegård
992
0.65
9.74
49
+
ns
ns
no
82
Nordfeld
993
1.50
10.25
224
ns
ns
ns
**
0<1/4, 1/2, 1/1
93
1
Treatment intensity index for herbicides against broad-leaved species
only. 2Sprayed in autumn only. 3Sprayed in spring only.