Hello Oleh Lushchak

please check the links

http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0080238

Please go through these links

https://extension.umd.edu/sites/extension.umd.edu/files/_docs/programs/woodland-steward/EB319_Paulownia.pdf

http://cropdevelopment.org/docs/PaulowniaBooklet.pdf

http://paulowniatrees.eu/products/requirements-for-growing-paulownia/

http://file.scirp.org/pdf/AJPS_2013111311520456.pdf

CLIMATIC CONDITIONS FOR GROWING PAULOWNIA

1-Temperature and altitude : Paulownia can adapt to a wide range of temperatures. Generally Paulownia species grow up to 2000m. The development starts in the spring, when the soil temperature reaches 15-16оС.

2- Soils conditions : Paulownia is highly adaptive species and grows well on many types of soils. Most appropriate and recommended are light, well drained and sandy soils with or without slopes. Most recommended are deep well drained soils with pH from 5.0 to 8.9.Avoid clay, rocky and soaked soils. Soils that are consisted from over 25% of clay and porosity under 50% are not recommended for Paulownia. Paulownia does not tolerate salinity over 1%. Young Paulownia plants develop well, when the soil depth is at least 1.5-2 meters.

3- Rainfalls : air humidity are very important for Paulownia growing. Additional watering is necessary if the annual rainfall drop under 100mm per month.

4- Winds : Plantation is good to be planted at areas without strong winds reaching over 28km/h. When there are stronger winds at the place of planting stabilizing post has to be put during the first year of development until they form strong wooden stem. The speed of the wind is dangerous for the young plants over 45km/h and such areas have to be avoided