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Table 2.

Biomass and total N concentration at the seed filling stage for strictly N2‐fixing plants (N0 treatment) and for plants supplied with nitrate (N5 treatment) for each experiment

Plant set (sowing date) Total biomass (g per plant) Shoot biomass (g per plant) Root biomass (g per plant) Nodule biomass (g per plant)
15 September 1999
 N5 8·9 ± 2·1 8·4 ± 2·1 0·39 ± 0·12 0·04 ± 0·02
 N0 6·6 ± 0·3 6·2 ± 0·2 0·29 ± 0·06 0·13 ± 0·09
3 March 2000
 N5 22·9 ± 1·8 21·6 ± 1·8 1·21 ± 0·40 0·07 ± 0·05
 N0 17·3 ± 0·7 16·4 ± 0·7 0·73 ± 0·03 0·17 ± 0·01
16 March 2000
 N5 20·5 ± 1·7 19·4 ± 1·7 1·02 ± 0·11 0·05 ± 0·02
 N0 14·4 ± 1·9 13·5 ± 1·8 0·71 ± 0·09 0·16 ± 0·01
26 May 2000
 N5 13·0 ± 1·6 12·1 ± 1·5 0·83 ± 0·07 0·04 ± 0·01
 N0 8·2 ± 1·4 7·7 ± 1·3 0·40 ± 0·07 0·10 ± 0·03

Plant were grown in a glasshouse on different occasions in 1999 and 2000.