Experiment of Four Species Seed Pelleting for Forest Rehabilitation

Abstract

The study on experiment of four species seed pelleting for forest rehabilitation was aimed to understand the effect of seed pelleting on germination, survival and growth of four tree species.  Completely randomized design (CRD) with 4 replication was used in the experiment.  Two methods including pelleted and non-pelleted seeds were carried out.  Four tree seed species composed of Albizia lebbeck, Albizia procera, Peltophorum dasyrachis and Pterocarpus macrocarpus were used to do experiment at nursery. The results showed that, the highest tree species germination of pelleted and non-pelleted seeds were A. procera and P. dasyrachis as 24.0 and 72.0 %, respectively. The highest survival of pelleted seeds were A. procera and P. dasyrachis as both 100.0 % and the highest survival of non-pelleted seed was P. dasyrachis as 94.50 %. The highest diameter at ground level of pelleted and non-pelleted seed was A. lebbeck as both 0.24 cm. The highest height of pelleted and non-pelleted seeds were A. procera and A. lebbeck as 13.78 and 11.84 cm, respectively. The highest biomass at above ground of pelleted and non-pelleted seeds were A. lebbeck as 0.83 and 0.82 g tree^-1, respectively. The highest biomass at below ground of pelleted and non-pelleted seeds were A. lebbeck as both 0.47 g tree^-1. Analysis of different each species between pelleted and non-pelleted seeds by t-test showed that effect of seed pelleting to germination of P. dasyrachis and P. macrocarpus decreasing were significantly (p<0.01), effect of seed pelleting to survival of A. lebbeck, A. procera and P. dasyrachis increasing were significantly (p<0.01). Finally, effect of seed pelleting to diameter at ground level, height, biomass at aboveground and biomass at belowground of A. procera increasing were significantly (p<0.01)

According to this study, A. procera and A. lebbeck species had ability to use this pelleting method before planting in the restored area while P. dasyrachis was not suitable for this pelleting method and P. macrocarpus was not suitable for this pelleting method and direct seeding. However, pelleting technique was not clearly effect to increase germination and growth significantly in some species, so this technique should be studied more in near future.