Preliminary evaluation of dasometric and technological characters in selected willow clones for two site conditions in delta (Argentina)

LOVAL SABRINA; CERRRILO TERESA; SPAVENTO E; MARTINEZ MEIER A; MONTEOLIVA S

Roma

Congreso; 8TH INTERNATIONAL POPLAR SYMPOSIUM, IPC 2021; 2021

IPC

In the Paraná Delta, Argentina, forestry is the main productive activity. The systematization of the flooding areas is a practice that allows to reach the necessary aptitude for its cultivation. The aim of this work was study dasometric (diameter at breast height, (DBH) and height) and technological variables (green density and dynamic modulus of elasticity, MOEdin) in new selected clones of willow (Salix spp.) growing in two sites regarding protection against floods (highly protected and unprotected). Four willow genotypes achieved by the INTA´s breeding program were studied, three correspond to the combination S. matsudana x S. alba (Agronales, Los Arroyos and the experimental individual ?94.13.06?) and one to open pollination of S. alba (Yaguareté). At 12 years of age DBH, height, green density and MOEdin were measured. On the high protection site (without permanent waterlogging during the trial) the clones "94.13.06" and Agronales (characterized by their low tolerance to waterlogging) presented significantly higher values in growth respect to other clones on the trial (improvement of 17.5% and 7.8% in DBH and MOEdin). On the unprotected site (with 13 episodes of permanent waterlogging), Yaguareté, one of the clones more tolerant to recurrent floods, presented significantly the best growths in DBH, MOEdin and green density against to other clones on the trial (increase of 16.3%, 8.3% 2.7%, respectively). In this preliminary evaluation, the importance of the adequate selection of genotypes better adapted to the particular cultivation conditions in the Delta area is confirmed (related to the presence or absence of water stress due to flooding). In this trial, only one of the most tolerant clones (Yaguareté) achieved very good growth and technological properties at the site with recurrent flooding. The non-tolerant clones (Agronales and ?94.13.06?) presented better results in the protected site.