Using small branck/rod (vegetative propogation) is not a good practice to get the maximum biomass in short span on time. please for for seedlings only. Now a days lot of company selling the high yielding hybrid seedlings. 

Best,

Thanks, but I'm interested about difference between the nature of propagating material for poplar sp.

Hi,

Here in Canada, we have recently planted cuttings of 2 poplar hybrids. They seem very fast growing. We got them from Derek Sidders. You may want to ask him.

https://www.researchgate.net/profile/Derek_Sidders?ev=brs_highl

Hello I. Danila,

Here in India also many Paper industry promote growing of popular tree for mainly pulf/paper making application. It is all vegetatively propagated 2-4 month old grafts.  If you need contact details of Indian industry, i will provide for your immediate use. 

Best wishes,

who is interested, i have more answers on this question, about different type of material for reproduction for hybrid poplar ( seedlings, cuttings and rods) 

https://www.researchgate.net/post/Any_suggestions_on_seedling_cuttings_or_rods_for_short_rotation_forestry_SRF

Article Hybrid poplar growth in bioenergy production systems: Biomas...

https://www.canr.msu.edu/uploads/396/36452/2016c.pdf