Abstract

TORAL, Odalys C  and  IGLESIAS, J. M. Effect of pruning on the biomass yield of 20 accessions of tree species. Pastos y Forrajes [online]. 2007, vol.30, n.3, pp. 1-1. ISSN 0864-0394.

The performance of 20 tree accessions when pruned was evaluated during five years, for which a randomized block design with eight repetitions was used. The edible, ligneous and total biomass, as well as the bromatological composition and number of regrowths were determined. In the rainy season L. macrophylla CIAT-17240 and L. leucocephala CIAT-17498 showed a better performance, regarding biomass yield (3,02 and 3,15 kg DM/tree as average). The number of regrowths varied between 7 and 24 and the best result was observed in L. leucocephala CIAT-17498 (24 regrowths per plant). Nevertheless, in the dry season the edible biomass production fluctuated between 0,10 and 1,25 kg DM/tree, and L. leucocephala CIAT-17498 stood out again. A performance similar to that of the rainy season was observed in the other indicators. The best results regarding edible biomass production were concluded to be found in the rainy season; L. leucocephala CIAT-17498 stood out in this indicator and in the number of regrowths for both seasons. The dry matter, crude fiber and crude protein contents of the edible biomass of the plants, had little variation due to the effect of the season within the same species, a trend that was also observed for minerals. The accessions proved to be an important alternative for feeding ruminants, because of their high contents of crude protein.

Keywords : Multipurpose trees; pruning; yield.

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