Table 2. Pollen flow and seed set of male sterile plants of Salvia miltiorrhiza when producing hybrid F1 seeds with different row ratios.

Row ratio female:male	Pollen flow at distance (cm) (gradule/24 h)					Seed setting rate (%)	Seed index	Seed yield per individual (g)	Seed yield per hectare (g)
	30	45	60	75	Average
2:1	2	2			2	54.7	0.30	0.50	6495
2:2	2	2			2	54.2	0.29	0.32	3120
3:2	2	2	1		1.67	47.6	0.27	0.49	5730
4:4	2	2	1	1	1.5	44.0	0.23	0.42	4095