Suppression of Bromus tectorum L. by Established Perennial Grasses: Potential Mechanisms—Part One

Table 6

Selected soil nutrient measurements following the 5th harvest.

Depth (cm)	B. tectorum without competition	B. tectorum in competition	Perennial grasses	ANOVA
	Mineral nitrogen (mmol kg^−1)			Plant 𝑃=0.8345
0–30	0.97^AB	0.90^AB	0.27^B	Depth 𝑃=0.0025
30–60	0.90^AB	1.31^A	1.33^A	Inter. 𝑃=0.0631
	Mole % NH4^+ in mineral nitrogen pool			Plant 𝑃=0.0087
0–30	34^B	59^A	65^A	Depth 𝑃<0.0001
30–60	16^B	23^B	18^B	Inter. 𝑃=0.0430
	Soil solution phosphorus (𝜇mol L^−1)			Plant 𝑃=0.3256
0–30	9.2	9.3	7.7	Depth 𝑃<0.0001
30–60	3.7	4.2	3.8	Inter. 𝑃=0.6458