Seed source variation for growth inEucalyptus dunnii;results from trials in south central China

Abstract

Two series of Eucalyptus dunnii field trials were established at two locations in the north of Guangxi province in south central China between 1988 and 1991 to examine growth performance and genetic variation of trees from I 0 natural seed sources. After four years, mean heights in the trials ranged up to 14.2 m and mean diameters at breast height up to 12.0 em. Significant differences between seed sources existed for height and diameter and there were significant seed source by environment interactions in height and diameter across sites. However absolute magnitudes of differences between seed sources were small and changes in performance across sites were relatively unimportant. No one seed source showed absolute superiority at both locations across assessment ages. Seed source within the natural range is concluded to be of minor importance for optimising growth in plantations of the species though the variation within seed sources may be important for future domestication and tree improvement.

Processing sawn wood from thinned, unpruned 17-year-oldEucalyptus dunniiin southern China

“…Visual evaluation of trees marked for removal suggested 31 trees from two provenances could be candidates to supply sawlogs for processing studies (other provenances could also have supplied logs, but due to limited resources it was decided to focus on just two). The provenances were 'State Forest 283, Flat along Teviot Brook, Qld' (28°10ʹS, 152°30ʹE) (Provenance 1) and 'Dead Horse Track, East of Legume, NSW' (28°25ʹS, 152°20ʹE) (Provenance 2-more details on the origins of these provenance seedlots have been provided by Wang et al (1999)). …”

O Mercado Dos Fertilizantes Agrícolas Que Abastecem O Agronegócio No Brasil E Suas Estratégias De Vendas

“…O descongelamento pode ser realizado de maneira rápida ou lenta, sendo que há autores que afirmam que o descongelamento lento pode provocar danos menores às células comparado ao rápido uma vez que nas células vegetais a desplasmólise rápida pode levar à morte (WANG et al, 1999) e outros autores afirmam que quanto maior o tempo de descongelamento, melhor a preservação de suas características fisiológicas (MOLINA et al, 2006).…”