. 2018 Jan 17;121(4):699–709. doi: 10.1093/aob/mcx202

Table 2.

Summary of two-way ANOVA (sum of squares [SS] given as percentage of total SS) showing the effects of two mineral nitrogen (N) concentrations (0 or 11 mm NO₃⁻) and two flooding regimes (drained or waterlogged) on nodule characteristics of Melilotus siculus. Treatments were imposed 23 d after imbibition, for 21 d (plants were 44 d old when harvested)

Parameter	Figure where data are shown	Main effects		Two-way interaction
Parameter	Figure where data are shown	N	Flooding	N × flooding	Residual
Nodule N concentration	2E	8.4^ns	46.4**	24.7*	20.5
Nodule N content^a	2F	15.7^ns	0.3^ns	22.7^ns	61.3
Total number of nodules	3A	6.8^ns	24.5^ns	1.5^ns	67.3
Number of nodules on main root system	3B	12.5^ns	34.8*	9.3^ns	43.5
Number of nodules on adventitious roots	3C	<0.01^ns	1.0^ns	4.4^ns	94.6
Nodulation (nodules formed during treatment)	3D	6.8^ns	24.5^ns	1.5^ns	67.3
Individual nodule dry mass	3E	43.0*	4.8^ns	5.0^ns	47.1
Nodule dry mass/root dry mass	3F	71.4***	0.6^ns	20.4**	7.6

d.f. = 1 for all factors and interactions except residual, where d.f. = 8.

*P < 0.05; **P < 0.01; ***P < 0.001; ns, not significant.

^aTissue N concentration × tissue dry mass.