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Field Survey Summary Tables – Alberta
23
Table 5. Number of fields surveyed, density, species richness and weed-free quadrats in the surveyed crops
Number of
Density
Species
Weed-free
fields surveyed
(number/m
2
)
(number /field)
quadrats
Crop
mean SE median
mean SE
%
SE
Annual crops
436
11.5
1.1
3.8
3.5
0.1
51.3
2.4
Cereal crops
303
14.7
1.5
5.4
4.0
0.1
43.2
2.8
Spring wheat
155
12.7
1.7
5.0
4.0
0.2
45.6
4.0
Barley
107
18.5
3.5
6.3
3.9
0.2
41.1
4.8
Corn
39
11.6
2.5
4.7
4.5
0.4
41.0
7.9
Broad-leaved crops
133
4.1
0.7
1.4
2.4
0.2
70.1
4.0
Canola
68
5.2
1.2
1.9
2.8
0.3
64.1
5.8
Dry beans
27
2.1
0.8
0.7
1.4
0.3
81.9
7.4
Potatoes
19
1.0
0.2
0.8
1.9
0.3
81.5
8.9
Sugar beets
17
3.0
1.3
0.2
2.3
0.7
73.4 10.7
Perennial crops
135
17.6
1.9
9.2
2.8
0.2
34.2
4.1
Alfalfa
89
19.3
2.6
10.6
2.9
0.2
30.7
4.9
Grass hay
46
14.3
2.8
6.4
2.7
0.3
40.9
7.2
All crops
571
12.9
1.0
4.5
3.4
0.1
47.3
2.1