大蒜根系分泌物对不同品种烤烟的化感作用

在土培条件下，通过用不同种植密度的大蒜与四种烤烟品种K326、翠碧一号、云烟87和红花大金元进行共培来测定大蒜根系分泌物对烤烟种子发芽、幼苗根长、苗高和鲜重的影响，并计算化感效应指数（RI）。结果表明,大蒜根系分泌物对不同品种烤烟均有一定的化感作用。大蒜根系分泌物对不同烟草的发芽有着一定的抑制作用，作用较强的表现在云烟87品种，其发芽指数化感效应最大时为-0.393。大蒜根系分泌物在对不同品种烤烟生长的影响中，对不同品种烤烟的根长和鲜重有明显的促进作用，而对苗高有一定的抑制作用。根长化感效应最大时为0.336，表现在云烟87品种，化感效应最小时为0.043，表现在红花大金元品种；苗高化感效应最大时为-0.334，表现在翠碧一号品种，化感效应最小时为0.021，表现在K326品种；根长化感效应最大时为0.694，表现在K326品种，化感效应最小时为0.152，表现在翠碧一号品种。

Allelopathic effects of garlic root exudates on different varieties of flue-cured tobacco

Effects of garlic root exudates on seed germination, root length, seedling height, and fresh weight of flue-cured tobacco were determined by co-culture of garlic with four varieties of flue-cured tobacco(K326, Cuibi No.1, Yunyan 87, and Hongda) in soil. Moreover, the inductive effects(RI) were calculated. The results showed that garlic root exudates had allelopathic effects on different varieties of flue-cured tobacco. The root exudates of garlic had certain inhibitory effect on the germination of different tobacco varieties, which was stronger in Yunyan 87 variety, and the maximum germination index allelopathy was found to be-0.393. Garlic root exudates significantly promoted the root length and fresh weight of different flue-cured tobacco varieties, but inhibited the seedling height. The maximum value of allelopathic effect on root length was 0.336, which was observed in Yunyan 87 variety, and the minimum value was 0.043 in Hongda variety. The maximum value of allelopathic effect on seedling height was-0.334, observed in Cuibi No.1 variety, and the minimum value was 0.021, which was observed in K326 variety. The maximum value of allelopathic effect on root length was 0.694, which was observed in K326 variety, and the minimum value was 0.152, observed in Cuibi No.1 variety.