Relative competition intensity (RCI)
The relative competition intensity (RCI) gave us variable results for traits of both the species, some of which were positive and others were negative (Fig. 4). Plant height of WT under CK, F and N was affected negatively and showing strong competition, but combination of additional nitrogen and flooding (F.N, F.2N) had a positive effect on plant height, while plant height of WC in most treatments had RCI below zero, showing strong competition (Fig. 4). LN and CHl of WC were positive under interaction of nitrogen and flooding (F.N and F.2N) but WT had negative values under these treatment levels, indicated that WTbecame competitor and WC became facilitator.