Table 1.

Heterosis of nicotine content of hybrid combination(Va116 × Basma)in tobacco

Years	Developmental stage	Mid-parent heterosis	Over high-parent heterosis	Below low-parent heterosis
2013	BT	11.48	3.92	20.24
	AT	34.56	24.65	46.18
2014	BT	10.39	2.13	20.11
	AT	40.84	28.38	55.99
2015	BT	2.83	2.36	3.31
	AT	44.82	33.48	58.26