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Field Survey Summary Tables – Ecodistrict 829
98
Table 100. 2009 irrigated cereal crops in the Purple Springs Plain Ecodistrict (829) in the Mixed Grassland
Ecoregion (13 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Wild oats
46.2
7.7
16.7
1.6
3.4
6.6
64.4
2
Kochia
53.8
8.1
15.0
1.0
1.9
3.0
59.7
3
Wild buckwheat
15.4
8.1
52.5
0.7
4.4
8.2
37.0
4
Redroot pigweed
23.1
6.9
30.0
0.6
2.7
7.6
37.0
5
Alfalfa
7.7
6.2
80.0
0.7
9.0
9.0
29.2
6
Foxtail barley
15.4
1.2
7.5
1.2
7.8
15.0
29.1
7
Canada thistle
23.1
1.5
6.7
0.2
0.9
2.2
17.5
8
Timothy
7.7
0.8
10.0
< 0.1
0.6
0.6
6.0
9
Dandelion
7.7
0.8
10.0
< 0.1
0.4
0.4
5.8
10
Showy milkweed
7.7
0.4
5.0
< 0.1
0.6
0.6
5.1
11
Field bindweed
7.7
0.4
5.0
< 0.1
0.2
0.2
4.6
12
Lamb's-quarters
7.7
0.4
5.0
< 0.1
0.2
0.2
4.6
Table 101. 2009 irrigated broad-leaved annual crops in the Purple Springs Plain Ecodistrict (829) in the
Mixed Grassland Ecoregion (13 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Lamb's-quarters
23.5
2.7
11.7
0.1
0.6
0.8
56.1
2
Canada thistle
21.7
1.9
8.6
0.2
0.8
1.4
51.5
3
Canola (Argentine)
15.7
2.7
17.5
0.1
0.8
1.0
47.8
4
Kochia
23.5
1.6
6.7
0.1
0.5
1.2
45.6
5
Purslane
7.8
1.2
15.0
0.1
1.4
1.4
28.0
6
Wild buckwheat
6.1
1.5
25.0
0.1
1.4
1.4
26.3
7
Common groundsel
7.8
1.2
15.0
0.1
0.8
0.8
22.5
8
Redroot pigweed
15.7
0.8
5.0
< 0.1
0.2
0.2
22.3