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Field Survey Summary Tables – Mixed Grassland Ecoregion
57
Table 42. 2009 irrigated corn in the Mixed Grassland Ecoregion (22 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Wild buckwheat
68.8
17.3
25.1
1.3
1.9
8.2
49.8
2
Wheat
19.3
9.9
51.6
2.4
12.3
30.0
40.8
3
Canola (Argentine)
46.6
14.4
31.0
1.0
2.2
6.0
38.1
4
Lamb's-quarters
42.4
8.6
20.3
1.0
2.3
12.2
30.2
5
Redroot pigweed
37.0
7.8
21.1
0.7
1.8
7.6
24.6
6
Dandelion
27.7
6.4
23.1
0.6
2.0
8.4
19.8
7
Kochia
37.6
3.6
9.5
0.2
0.5
0.8
15.3
8
Green foxtail
10.3
3.5
34.1
0.8
7.6
13.0
14.7
9
Alfalfa
17.9
4.4
24.4
0.4
2.4
9.0
13.8
10
Shepherd's-purse
10.0
3.7
37.5
0.4
3.8
4.2
10.6
11
Wild oats
9.1
3.7
40.3
0.3
3.4
7.0
9.6
12
Round-leaved mallow
18.4
2.6
13.9
0.1
0.7
1.2
8.7
13
Canada thistle
16.0
1.8
11.3
0.1
0.6
1.0
6.9
14
Stinkweed
9.3
0.5
5.0
< 0.1
0.2
0.2
3.0
15
Quack grass
5.0
0.5
10.0
0.1
1.2
1.2
2.4
16
Barley
4.3
0.6
15.0
< 0.1
0.6
0.6
2.0
17
Field bindweed
4.3
0.4
10.0
< 0.1
0.4
0.4
1.7
18
Downy brome
5.0
0.2
5.0
< 0.1
0.4
0.4
1.7
19
Foxtail barley
5.0
0.2
5.0
< 0.1
0.2
0.2
1.6
20
Flixweed
5.0
0.2
5.0
< 0.1
0.2
0.2
1.6
21
Pale smartweed
5.0
0.2
5.0
< 0.1
0.2
0.2
1.6
22
Barnyard grass
4.3
0.2
5.0
< 0.1
0.2
0.2
1.4