Influence of phenolic substances on rooting of softtrood cuttings of Populus alba L. and P. canescens Sm.

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Abstract
Pyrogallol and salicylic acid used alone or in combination with auxin increased markedly the number of rooted cuttings, the number of roots per cutting and the total length of roots per cutting. The effect of phenolic substances was most visible when treatment was done in late summer, i.e. when natural ability to form roots was very low.

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