Columns with different letters indicate significant differences within indica-inbred set or and indica-hybrid set at P < 0.05 according to ANOVA, followed by Turkey HSD tests.

Supplementary Table 2 Preliminary experiment to determine inhibition (%) of allelopathic rice cultivars ‘Huagan-3’ and ‘Lingyou-6173’ mixed culture with the same cultivars ‘Huagan-3’ and ‘Lingyou-6173’, closely related cultivars ‘Huagan-8’ and ‘Lingyou-6365’ and distantly related cultivars ‘Huafeng’ and ‘Lingyou-3826’ (both indica) and Liaojing (japonica) on four paddy weeds at different mixture proportions.