Poplar

Populus spp
P. nigra, P. deltoides, P. maximowiczii and P. trichocarpa, P. tremula

General info

Poplar (Populus spp.) belong to the family Salicaeae and are native to the Northern hemisphere. Poplar is among the fastest growing of temperate trees and is therefore of considerable interest as a bioenergy crop.The plant grows to a height of 15–50m with a trunk diameter of 2.5m. Once established, poplar can beharvested every 2-5 years over a life span of over 20 years. Poplar is a multipurpose crop with several environmental benefits such as reducing erosion, phytoremediation of contaminated soils, windbreaks, and biodiversity.

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Cultivation and agronomy

Poplar is suited to most soil types including clay, sand, loam, and humus soils. It grows particularly well on well drained and fertile loam with a wide range pH of 5-8. Poplar can be grown as a Short Rotation Forestry(SRF) or Short Rotation Coppice (SRC). The plant can grow up to about 1.5m in height during the first yearand from 3-5m for each of the following years depending on the cultivar, site conditions, spacing andmanagement practices. For large scale plantations, it is recommended to plant mixtures of poplar varieties with about 100 trees of a single cultivar in each block, and different cultivars in neighbouring blocks.

If considering mechanised harvesting, plant at a spacing of 0.6m apart in twin rows with 0.75m between rowsand a 1.5m alley between each twin-row. Poplar can be planted in densities of 1,500 up to 1,800 trees per hectare for bioenergy purposes. Yields of 20-25m3 of wood/ha/yr is achievable in the UK. Young growth is attractive to deer, hare, and rabbits. Appropriate fencing may be required in areas where these animals areprevalent. Common pests includes the small poplar leaf beetle (Phratora vitellinae), and the large leaf beetle (Chrysomela populi).

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