. 2003 May;91(6):613–622. doi: 10.1093/aob/mcg067

Table 2.

Photosynthetic nitrogen and phosphorus use efficiencies (PNUE, PPUE; g structural d. wt g^–1 N(P) d^–1) of parent plant leaf blade material over an 18‐d period following cessation of culm elongation growth in Poa alpina

	Treatment
	Low nutrient		High nutrient
Nutrient	Ambient CO₂	Elevated CO₂	Ambient CO₂	Elevated CO₂
PNUE	0·9 ± 0·32^b	0·1 ± 0·08^a	0·9 ± 0·51^ab	4·1 ± 0·87^c
PPUE	1·9 ± 0·64^a	0·3 ± 0·19^a	1·7 ± 0·92^a	11·9 ± 2·59^b

Plants were grown in either one‐fifth strength (low nutrient) or full‐strength (high nutrient) Long Ashton nutrient solution, and either 350 µmol mol^–1 (ambient) or 690 µmol mol^–1 (elevated) CO₂. Data are means of four replicates ± s.e. Different superscripts indicate significant differences between treatment means for each nutrient use efficiency (PNUE or PPUE) at P < 0·05 determined by Tukey’s multiple comparison procedure (ANOVA) (sensu Zar, 1999).