Resumen

GUEVARA, Eunice  y  GUENNI, Orlando. Accumulation and distribution of biomass in Leucaena leucocephala (Lam.) de wit during the phase of establishment. II. Repartitioning of biomass. Zootecnia Trop. [online]. 2004, vol.22, n.2, pp.147-156. ISSN 0798-7269.

In the present study, dry matter accumulation and the pattern of distribution between aerial and bellow-ground biomass were studied in three accessions (CIAT 7984, 9438, 18477) of Leucaena leucocephala during 110 days after germination (DAG). Cv. Perú was used as a control plant. The experiment was carried out under glasshouse conditions, where plants were grown in PVC pots (1 m height x 0.20 m diameter). A completed randomized designed was used, in a factorial arrangement of 4 plant materials x 5 harvests (ie. 15, 30, 45, 60 and 110 DAG) x 5 replicates. To estimate biomass accumulation and assimilates distribution within the plant, harvests of individual plants were performed and the dry weight of leaf (LDM), stems (SDM) and root (DMR) at different depths was recorded. Initially, all accessions diverted a high proportion of the available energy in producing root biomass, while by the end of the establishment period relatively more photosynthetic material was used to increase leaf and stem biomass. The MSh was not different (P<0.05) among the lines for two finish court (60 and 110 DDG), the Mst of the line 9438 and the cv Peru was bigger (P<0.05) in comparison to the line 18477, and the MSr of this last one (18477) it was not different statistically (P<0.05) to the 30 and 110 DDG, what suggests a potential under non limited conditions. The distinctive pattern of distribution of forage biomass within the accession 18477, disserves further research in future programs of agronomic improvement.

Palabras clave : Acumulación de materia seca; distribución de biomasa; Leucaena leucocephala; Dry matter accumulation; biomass distribution; Leucaena leucocephala.