Data/hora: 25/06/2024 05:46:41

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 25/09/2008
Data da última atualização: | 25/09/2008
Autoria: | LAZCANO, C.; SAMPEDRO, L.; ZAS, R.; DOMÍNGUEZ, J.
Título: | The effect of vermicompost on pine (Pinus pinaster) germination and the role of plant genotype.
Ano de publicação: | 2008
Fonte/Imprenta: | In: INTERNATIONAL COLLOQUIUM ON SOIL ZOOLOGY, 15; INTERNATIONAL COLLOQUIUM ON APTERYGOTA, 12., 2008, Curitiba. Biodiversity, conservation and sustainabele management of soil animal: abstracts. Colombo: Embrapa Florestas. Editors: George Gardner Brown; Klaus Dieter Sautter; Renato Marques; Amarildo Pasini. 1 CD-ROM.
Idioma: | Inglês

Conteúdo:

The use of organic amendments such as vermicompost might be considered in forest nursery
as a mean to reduce fertilizer expenses and the impact of the exploitation of highly valuable and
non-renewable materials such as peat.
Genetic improvement programs select genotypes that best meet the requirements for a good
adaptation to the environment and optimal yields; nevertheless, given the phenotypic plasticity
of the species, their growth and field performance might vary depending on the environment and
breeding practices. Several studies have demonstrated that vermicompost can improve
germination and enhance growth in some plant species; nevertheless, the effects of vermicompost
have been described mainly on horticultural and ornamental plants and to a lower extent in
forestry species. Besides, vermicompost effects might vary between genotypes of the same
species.
We therefore investigated the effect of vermicompost, on the germination and early development
of six progenies of Pinus pinaster.
Pine seeds from six open-pollinated P.pinaster families, selected for superior growth, stem
form and branch characteristics, were collected from an experimental orchard in Sergude
(Galicia, NW Spain). Eight seeds belonging to the same family were sown in 500 ml pots, filled
with perlite and a superficial layer of 3 cm of sand, where the treatments were applied. Treatments
consisted in: (i) solid vermicompost incorporated into the sand layer (1:1, v:v), (ii) vermicompost
tea administrated once a week. Controls were made with no vermicompost addition. Seed
germination, seedling growth and ontogenic development were evaluated.
There was a clear effect of the genotype on the germination parameters as well as on the early
development of the seedlings. In addition there was an effect of the treatments on most of the
parameters studied. Both solid and liquid vermicompost showed to be suitable amendments
for the potting media of pines. The percentage of final germination was increased by
vermicompost tea addition and the seeds that germinated with vermicompost tea matured faster
that the ones germinated in vermicompost. The seedlings germinated in vermicompost and the
ones with vermicompost tea showed significantly lower root biomass than the ones germinated
in sand. However this reduction did not affect the aerial biomass and it was not attributable to a
nutrient deficit since the seedlings where the treatments were applied had significantly more
leaf nitrogen that the control.
Almost no genotype x treatment interaction was significant meaning that the effect of
vermicompost was equal for all the families independently of the genotype.

Categoria do assunto: | --
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (43725-1) - UPE - PL - -- - CD0305 -  -  - DIS