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

Table 5

Mean above-ground tissue nitrogen and phosphorus concentrations by plant species and growth cycle.

Plant	Growth cycle
	1st	2nd	3rd	4th	5th
	Tissue nitrogen (%)
B. tectorum (without competition)	2.07^A	2.27^A	2.27^A	3.68^AB	3.35
B. tectorum (in competition)	1.26^AB	1.50^B	2.55^A-C	4.20^A	3.86
L. triticoides	1.02^B	1.13^BC	2.56^BC	3.58^AB
E. wawawai ensis	0.97^B	0.97^BC	2.13^C	2.09^C
A. hymenoides	1.46^B	0.78^C	3.34^A	3.00^BC
ANOVA	𝑃=0.0002	𝑃<0.0001	𝑃=0.0054	𝑃=0.0004	𝑃=0.0994
	Tissue phosphorus (mmol kg^−1)
B. tectorum (without competition)	91.0^A	110.7^A	122.8^AB	112.7^AB	93.3^B
B. tectorum (in competition)	nd	nd	131.6^A	134.6^A	129.3^A
L. triticoides	24.2^BC	32.9^B	94.5^C	84.5^BC
E. wawawai ensis	18.2^C	27.8^BC	67.7^D	58.2^C
A. hymenoides	41.2^B	19.6^C	99.8^BC	58.7^C
ANOVA	𝑃<0.0001	𝑃<0.0001	𝑃<0.0001	𝑃<0.0001	𝑃=0.0476

Separate ANOVAs used for each growth cycle. For each column, different superscripted letters denote significant differences. nd: not determined due to lack of sufficient plant tissue for analyses.