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. 2009 Dec 25;105(3):365–374. doi: 10.1093/aob/mcp297

Table 1.

Effects of phosphate treatments on root mass ratio (total dry mass/root dry mass), leaf/root area ratio, relative growth rate and P uptake in Lupinus albus, L. atlanticus and L. micranthus plants during 54 d in hydroponics culture

P uptake
P treatment (μm) Root mass ratio, day 54 (g g−1) Leaf/root area ratio, Day 54 (cm2 cm−2) Relative growth rate, days 8/54 (d−1) mg g−1 d−1 mg m−2 d−1
L. albus
1 0·37a 0·46b 0·039b 0·06c 0·83c
10 0·32b 0·70a 0·044ab 0·36c 4·55c
50 0·33b 0·64a 0·050a 4·90a 77·44a
150 0·32b 0·60a 0·047ab 3·35b 49·72b
Mean 0·33a 0·60a 0·045b 2·45b 33·14b
L. atlanticus
1 0·30a 0·34b 0·049b 0·09c 0·91c
10 0·29a 0·51ab 0·061a 2·43b 25·43b
50 0·28a 0·51ab 0·060a 5·52a 62·20a
150 0·27a 0·66a 0·057a 6·13a 63·54a
Mean 0·28b 0·52b 0·057a 3·54a 38·02a
L. micranthus
1 0·33a 0·30b 0·048a 0·09b 0·70b
10 0·21b 0·58a 0·036b 4·81a 44·71a
50
150
Mean 0·27 0·44 0·042 2·17 22·21

Treatments marked with the same lower-case letter are not significantly different within each species using one-way ANOVA followed by Duncan's multiple test (P < 0·05). Treatment means indicated a difference among species using two-way ANOVA followed by Duncan's multiple test (P < 0·05); not relevant for L. micranthus because there were no data for 50 and 150 µm P.