Download free Acrobat Reader to view these files . You may need to install the following Armenina font file . This can occur naturally where the geographic distribution of two crossable species overlap. Hybrids also are developed through plant breeding. The term hybrid vigor describes the faster growth of hybrids when compared with growth of either parent.
Hybrids are usually more widely adaptable or tolerant of environmental extremes than the parents.
Many Populus hybrids have been produced and named since the early 1900s. Because considerable variation is present within most species of Populus, hybrids between two species but from different parent clones can be very different. Use of hybrid poplars for wood and fiber production called short rotation intensive culture. In culture and in harvesting the system is closer to agriculture than to forestry. Success of the system depends on having good soil, appropriate cultural practices and trees bred and selected specifically for high productivity.