PENGARUH INTENSITAS NAUNGAN DAN PEMBERIAN PUPUK ANORGANIK TERHADAP PERTUMBUHAN SEMAI Hopea bancana (Boerl.) Slooten

Abstract

Hopea bancana (Boerl.) Slooten is an important species of timber-producing trees. This species is endemic to Indonesia and is categorized as threatened plant (critical: Critically Endangered) based on the IUCN Redlist of Threatened Species 1998. Research and development on its silviculture aspects is very important as an effort to support the recovery of species and enrichment of the population in nature. This study aims to determine the effect of shade intensity and application of inorganic fertilizer (NPK) on Hopea bancana 's survival and seedling growth. The study was conducted with factorial complete randomized design consisting of 2 factors, namely: shade factor with 2 levels (50% and 75%) and inorganic fertilizer with 4 levels (0 gr, 3, gr, 4 gr, and 5 gr), so that 8 combinations of treatments were obtained. The survival rate was analyzed descriptively. Growth variables which included growth in height, number of leaves, leaf length, and root length were analyzed by analysis of variance (ANOVA). The results showed that the shade intensity of 50% gave better results in the survival rate of the seedlings. Shade intensities and inorganic fertilizer factors showed very significant differences in plant growth and root length. The best results of growth parameters of plant height, leaf number, and leaf length were indicated by N350 treatment (NPK fertilizer 3 gr, 50% shade intensity), while root length was indicated by N050 (NPK fertilizer 0 gr, shade intensity 50%). Treatment of NPK 3 gr at 50% shade intensity tends to show the best results in the character of seedling growth.