Knapweed Density Research

Knapweed Density Research Results - June 21, 1997

Knapweed Density in Randomly Chosen 1m² Quadrats

Sample #	Knapweed	Western Wheat	Buffalo Grass
Random 1	3	+	-
Random 2	27	-	-
Random 3	13	-	-
Random 4	7	-	-
Random 5	4	+	-
Random 6	5	-	-
Random 7	3	+	+
Random 8	14	+	-
Random 9	7	-	+
Random 10	9	-	+
Random 11	17	+	+
Random 12	5	+	-
Random 13	6	+	+
Random 14	7	+	-
Random 15	9	+	-
Random 16	12	-	+
Random 17	7	-	+
Random 18	23	+	-
Random 19	8	-	+
Random 20	7	+	+
Random 21	6	+	-
Random 22	9	-	-
Random 23	8	+	-
Random 24	12	-	+
Random 25	9	-	-
Random 26	8	+	-
Random 27	9	-	+
Random 28	7	+	+
Random 29	15	+	-
Random 30	3	-	+
	mean = 9.63	present = 16	present = 13

Knapweed Density in 1m² Quadrats Containing a Buffalo Grass Patch

Sample #	Knapweed	Western Wheat	Buffalo Grass
Patch 1	4	-	+
Patch 2	3	+	+
Patch 3	0	+	+
Patch 4	1	-	+
Patch 5	0	-	+
Patch 6	0	-	+
Patch 7	2	+	+
Patch 8	1	-	+
Patch 9	1	-	+
Patch 10	0	-	+
Patch 11	4	-	+
Patch 12	2	-	+
Patch 13	1	+	+
Patch 14	0	-	+
Patch 15	0	-	+
	mean = 1.27	present = 4	present = 15

Buffalo Grass patches appear to exclude Knapweed (P = 0.0001) and also to exclude Western wheat.

Western wheat patches could exclude Knapweed, but did not appear to be as effective at excluding Knapweed as the Buffalo grass patches.

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